"If you have an excuse, I'm willing to listen."
Karen smiled, but Kazuki could not say anything as he sat on the floor. Rumina was equally silent while she sat next to him, but she puffed out her cheeks to express her displeasure.
"Since you have nothing to say for yourselves, I will have to lecture you."
Karen glanced over at Rumina, breathed a somewhat troubled sigh, and opened her mouth.
"I'll start with Rumina. How could you do that without checking first? What if it was some other customer instead of Kazuki-san? Do you have any idea how much trouble that would have caused?"
"…I do, but I could tell from the smell."
"At least check his file…"
She pressed her fingers against her temples as if to alleviate a headache, frowned, and sighed.
"Anyway, you're still in training, so please avoid providing treatments on your own. Really, I hate to think what would have happened if that wasn't Kazuki-san…"
"If it wasn't, I bet I could've gotten their semen without revealing my identity."
That must have brought back the memories because Rumina drooled and glanced over at Kazuki's crotch. Karen noticed, so she glared at the girl and tugged up on her ear.
"It was you drinking his semen that was the problem! You haven't learned your lesson at all, have you!?"
"Hyaahhh!? I-I-I'm sorry! I have learned it…"
Overwhelmed by her angry sister's intensity, Rumina grew fearful and curled up her tail.
(It doesn't really matter, but I wish they would stop saying semen…)
Hearing those beautiful sisters using that word filled him with a strange feeling. But reacting in that way here would only increase the anger in Karen's eyes. He tried to think about math formulas to keep from getting hard, but his class's math teacher was a young newlywed woman. He pictured the plump feminine curves of her butt visible through her suit, so he only accelerated the transformation of his crotch.
"…Kazuki-san, why are you getting hard?"
"Uh…well…I was trying to keep this from happening, but…sorry."
He shrank down and hung his head when she turned her icy voice and glaring eyes in his direction, but Karen's behavior only inspired further lust and his erection twitched again.
"You don't seem to have learned your lesson. …Are you sure you understand, Kazuki-san? You are assisting us by testing one of our treatments. We cannot stop you from quitting partway through, but we can't have you receiving a different treatment. I have planned everything out to provide the greatest effect, so if you fail to follow that plan…"
Her interminable lecture was just one reasonable argument after another, so he had nothing to say in his defense. He could only hang his head and repeat that he had learned his lesson.
"Even if your goal is one specific girl, I would like for you to follow my plan to build your popularity. That is why I have been carefully managing your lust, and yet now you've done it with a trainee…and my little sister at that. I suppose I am partially to blame there."
Karen sighed again in an exasperated and sorrowful way.
(Uuh, I really am pathetic…and I have no excuse. But…)
It was no excuse, but even if she was a trainee and Karen's little sister, Rumina was undoubtedly an attractive girl. It was possible all succubi were attractive as a general rule. When a girl like that made advances, he could not avoid getting an erection. And when she teased it, it was going to go off before long.
(I mean, if a woman as beautiful as Karen-san would do it for me every single day…no, I need to have more self-control. Still…eating steak every day would be too much, so sometimes you really want some sushi…oh, I really am the worst.)
Kazuki realized just how terrible his analogies and way of thinking were, but when he was shown the polar opposite types of physical attraction seen in Karen and Rumina, he could not help but lust after both. Thinking about that only made his erection grow, so the tip curved back almost to his navel and the thick veins on the shaft began to throb.
"…K-Kazuki-san! Are you even listening!? Or are you trying to seduce me!?"
"Yes, I'm listening! Sorry!"
Karen yelled at him while her damp eyes stared straight at his penis. The heated intensity in her voice made him lower his head and apologize again, but…
"Hmph. Getting mad at someone for taking your favorite toy is so childish. Just because he's the first male customer you've been given full charge over doesn't mean you own him."
Rumina grumbled at a low enough volume that Kazuki could not quite make it out, but Karen must have heard her clearly because her eyebrows twitched and she glared at her.
"Did you say something, Rumina?"
"…N-no, nothing."
Rumina quickly looked the other way, but Karen was convinced she had not misheard. After a short silence, the little sister succubus was the first to make her move.
"Well, that was fun! See you later, Onii-san!"
She quickly got up and ran toward the exit. However…
"You are not getting away! Today, I really am going to punish you!"
"Hyaaahhh!? What!? My tail! My wings!"
Karen's tail seemed to grow longer and skinnier before racing sharply across the floor to pursue Rumina. It grabbed her ankles like a lasso to stop the girl. Once the little sister had tripped, it bound her torso, tail, and wings.
"K-Karen-san!? She's your sister, so, um…be a little nicer…"
"Oh? Are you taking Rumina's side, Kazuki-san?"
When she gave him a full-faced smile, his words caught in his throat and he could not respond. He fell silent and shook his head, so Karen nodded in satisfaction.
"O-Onii-san, help! Onee-chan's going to kill meeeee!"
(Sorry, Rumina… I don't want to die either.)
He pretended not to hear as the tail lifted Rumina onto the bed and forced her onto all fours. Her arms were folded against her torso while her legs were bent at the knee and spread to shoulder-width so she lay face down with her butt sticking up.
While trapped with her knees, shoulders, and face supporting her body, the constricted tail was wrapped around the base of her wings. Karen's tail locked in place so she could not move.
"Nn, nhhh…ahh, no… Forgive me, Onee-chaaaan…"
She tried moving her arms and legs with all her might, but she only produced a straining sound in the tail and did not even seem to be causing Karen any pain. Rumina gave up and begged for forgiveness, but the older sister succubus was not that kind. She ignored the pleas with a smile and turned toward Kazuki.
"Okay, Kazuki-san. If you are on my side, then come this way♪ You must be upset having a mere trainee make a fool of you like that❤"
"Eh? N-no, not really…"
"You – are – very – up – set – aren't – you?"
"..................Yes."
After having agreement forced out of him, Kazuki stood next to Karen.
"Wh-what are you doing? Onee-chan, Onii-san…c'mon, stop this…"
The bratty and sadistic girl he had seen in that bed earlier was nowhere to be seen. Instead, she looked up at him with tears in her eyes. Feeling a mixture of sadism and pity, Kazuki looked to Karen, wondering if they should forgive Rumina. However…
"That is only an act."
"Really!?"
"Yes," bluntly replied Karen. And since Rumina immediately clicked her tongue, it was apparently true. Those sisters knew each other quite well.
"…So what am I supposed to do?" he asked.
"Let's see… First, we need to teach Rumina that men are a frightening thing. And that a succubus must live by coaxing and taming those frightening men in order to milk their semen."
"That doesn't matter! Just let me go!"
Kazuki decided it was probably better to pretend he had not heard what Karen said there. When Karen noticed how hesitant he was to speak up, she quickly covered her mouth, suppressed a gentle smile, and whispered in his ear.
"Of course, I don't think of you that way. I just want to bring you as much pleasure as I can."
"It doesn't really matter. With you, I don't mind if you're deceiving me."
She really was bringing him lots of pleasure, so he could not really complain even if she was only taming him. But Karen must have really felt that way because she frowned and poked at his cheek.
"I'm not joking, you know? That's why I need Rumina to know how to pleasure you properly. First, we must teach her just how puny a being she is in front of as wonderful a partner as you."
"Now you're trying to win me over with praise? …You don't have to go that far."
The more she said, the more it seemed like she was forcibly trying to win him over and the more oppressive it felt. But Karen must have felt really low after what he had said because she quickly argued her case with lots of gesturing.
"I-I mean it! Um…it is true I don't want you to run away or quit your tester job! Um, but that's not the point…"
"Ha, ha! Onii-san hates you for what you're doing to me here!"
"Pipe down, Rumina! A-anyway…even without all that, I…"
She briefly fell silent to choose the right words. After finding the best way to express her feelings, she voiced them.
"I earnestly want to pleasure you and give you a manly body that will attract women. Rumina will eventually be allowed to treat you and other men, so I think this is a good opportunity to change her way of thinking."
She finished with her pretty eyes staring straight into his eyes. Her eyes looked cloudless, but was that due to a demonic charm?
"I know, I know. I believe you, Karen-san."
"Kazuki-san…thank you."
He was not going to go so far as to claim someone with such beautiful eyes could never tell a lie, but he knew how much she had done for him so far. He was a bit worried by the sadistic behavior that showed up on occasion, but it was not a major problem since she was so loving afterwards.
(Oh, maybe she really has tamed me.)
He smiled bitterly without meaning to, but that did create a peaceful atmosphere. After all, a girl had been tied to the bed by her sister and she was trembling like a baby bunny that had lost its chance to escape.
"O-Onii-san, you dummy. Don't let Onee-chan tame you like that."
(Oh, I really am being tamed.)
Karen cleared her throat to stop Rumina from saying any more.
"Now, to get back at this girl for teasing you and making you cum, how about you thoroughly torment her weak point?"
"Wh-what are you plotting!? Uuh…"
The cruel older sister's words made the little sister's voice tremble and left Kazuki nearly speechless.
"C-could we maybe go a little easier on her…?"
"What are you saying, Kazuki-san? You clearly want to do this. Your cock twitched again as soon as I said it, didn't it?"
Her palm and fingers crawled along his rod, making him moan quietly. The rubbing of her smooth skin immediately made his urethra twitch and drip with clear male fluid.
"Hee hee. I'm glad to see you're ready to go. But let's hold off on that for now. This big boy can have his fun after we've reviewed everything you've learned so far❤"
Instead of simply taking revenge on Rumina, she apparently wanted him to output everything she had taught him in the past few days. Realizing what that meant, the rod she was rubbing throbbed like mad and his hips trembled.
"Hee hee. That's right… Give Rumina a taste of your lips and tongue. You remember how, don't you?"
She blew a heated breath into his ear and then sucked at his earlobe.
"I'm talking about how you licked my pussy… How you sent your tongue crawling all over my crotch like a lonely housewife's dog. You remember those 69 and face-sitting lessons, don't you?"
"Hh…yes…ahh, hahh…"
She licked his earlobe with movements meant to remind him, produced a wet sound with her saliva, and sent pleasure crawling through his ear. His back tingled with arousal at the thought of using those movements on the girl bound in front of him who was Karen's little sister.
"Your erection twitched again. You are an excellent cunnilingus student, so I'm sure she'll enjoy it. Loosen her up like that and then show her some cock-flavored love♪"
She made an audible kiss and then removed her lips from his ear. But the heat of her lips would not leave his ears or his mind, so it heated him from within.
"Now, let's get started. Oh, but first…"
"Nhee! O-Onee-hyan…nhh…stop…ahhn!"
Karen rubbed her fingertip along Rumina's swimsuit-covered crotch and that was enough to cut away a portion of the fabric, exposing the youthful slit below.
"————! Th-this is… Karen-san, Rumina is…?"
"Yes, she has a hairless child pussy. Hee hee. How embarrassing…"
Rumina's cheeks grew deep red at Kazuki's gaze and Karen's laughter. She buried her ashamed face in the sheet. But the red-flushed white skin of her lower body was still exposed. That melted flesh must have been soaked ever since she was teasing him and she shamelessly stuck that proof of her horniness out toward him.
"But let's ignore that for now. …This girl's weak point is the other hole."
"W-wait, Onee-…nhyahhh❤ Ahee, hyahhh!"
Karen casually reached out a finger toward those hairless pussy lips which were so melted it gave glimpses of the pink flesh within, but then she moved her finger up above that. The tail wrapped around Rumina's butt like a rope had spread the cheeks, so Karen pressed her finger against the twitching indentation within that valley. Rumina's flesh easily gave way and seemed to swallow up Karen's finger.
"There…?"
"Yes, her asshole. Kazuki-san, you like being teased here too, don't you? Hee hee."
Karen used her other hand to massage Kazuki's butt and trace a finger through the valley. That stimulation made his hips move and sent precum squirting from his flesh rod and onto Rumina's butt.
"Succubi do not poop, so this is a purely sexual organ. That said, we can use our pussy or tail to accept someone inside us and we can use our mouth, hands, or feet to milk someone…so you might wonder when we use our asshole. However…"
While she explained, Karen moved her finger in a circle while pumping it in and out in order to widen Rumina's trembling hole and dig at the impure flesh within.
"Hyah, ah, nyahhh! Hahee, Onee-…hyahhh!"
"A succubus uses this hole – no, let's someone use it – when they are submissively offering themselves to someone. It is a crucible of their own lust and it prevents them from resisting whoever they are offering themselves to. It has an even stronger effect on Rumina, so once you start teasing it, she cannot resist at all. Just like this."
With that, Karen continued penetrating her little sister's anus with a smile on her face. Her entire finger twisted and bent seductively and the stimulation caused Rumina's flesh to twitch and loosen. A sweet aroma wafted from the gaping hole and plenty of thick and sticky fluid came out.
"Hee, gah…tha's noh…hrue! Onee…hyahn…you hummy…"
The little sister succubus clenched her teeth and looked back to deny her older sister's words even as her impure hole responded in exactly that way. Karen smiled as she watched and moved her head in close.
"It's no use lying, you masochistic succubus… Say what you want to hide your weak ass-pussy, but your ass tells the truth. …A masochist like you isn't fit to be a succubus❤"
Those words sent a tremor down Rumina's back and she shook her head while burying her face in the pillow. But her body continued trembling, her anus twitched while spread open with two fingers, and the love juices dripping from it had gained a milky translucence.
Karen watched her sister with a merciful expression and glanced over at Kazuki while she continued speaking.
"It won't take long before all the customers discover your weak point, you can't fight their sexual harassment, and they turn your ass into a receptacle for their cum. Is that what you're hoping for, you perverted masochist?"
"Nn, gh…hahh, hhh…nhh, nnnhhh!"
In what could only be called a twisted form of sisterly love, Karen seemed to know that was how Rumina would shine in fulfilling her purpose as a succubus, so she continued whispering the sadistic words. With each sentence, Rumina's sensual aura grew thicker, sweat soaked her entire body, and her flushed skin, body, and sticky internal flesh melted.
(Wow… Isn't she going way too far?)
Kazuki looked to Karen, but she must have misinterpreted his gaze because she nodded and beckoned him over.
(So is she going to keep going like this?)
He approached and sensed a sweet aroma as Karen removed her fingers from the impure hole. When she pressed her fingers against his lips to give him a taste of her little sister's insides, a tingling sensation and a sweet-and-sour honey-ish flavor spread through his mouth. The stimulation transformed into pleasure and shot to his lower stomach.
(Gh…ah, hahhhh!)
Her penis grew even more erect and Karen looked enthralled by it, but she reluctantly looked away and said one last thing to Rumina.
"Okay, it's time to punish you as your first step toward being a sex esthetician. Kazuki-san will teach you the humiliation of receiving a counterattack from the person you tormented so much❤"
That was also a go sign for Kazuki. When she gave him a bright smile, he could not disobey and kissed Rumina's flesh like he was being drawn to it.
"Khhhn! Nah, hahhh…"
As soon as he pressed his lips to her anus, Rumina's hips jumped up, pressing her butt back toward his passionate kiss. Nectar flowed into his lips, a melting sweetness and burning pleasure surged through him, and he could not help but stick his tongue out.
"Lick…lick, lick…"
A throbbing tingle reached the tip of his tongue, a sweetness followed it, and her juices dripped down. More than that, the hole accepting his tongue had grown loose as soon as he touched it, so he could easily push it open and it readily opened wide.
"Nkhhhhh! Hhhh, hahhhh…"
She must have been trying desperately to tighten that flesh because the opening and the pink inside trembled against his tongue. He used his tongue to soothe it, smeared on a mixture of her juices and his saliva, and thoroughly tasted her insides.
"Hwaahhh…ahh, nkh, hahhh…nhah, nhahhhh…"
Each time his tongue moved and licked her melted flesh, Rumina gave a heated and scratchy cry. Her lower body quickly grew limp, but her instincts pushed her hips back and wiggled her small butt around as if seeking his lips.
"Pwah, lick…slurp, lick, kiss, lick…"
As he moved his tongue in and out and occasionally spread his tongue out to lick, Rumina's hips moved about to an amusing extent. As she watched from the side, Karen blushed, gave a sadistic but kind smile, and laughed quietly. Kazuki and Rumina clearly heard the laughter and it made them both feel ashamed of what they were doing or having done to them.
"Hghh…nh, ah, ah hahhhh…kyah, nhee!"
Being violated by a human, who was supposed to be sexually weaker, while her sister watched had to be quite humiliating. She desperately gathered her strength, tensed her legs, and tried to keep her ass tight, but as soon as he pushed his tongue in again, her efforts collapsed, she went limp again, and more juices dripped out.
"Ngh, gh…slurp, slurp…"
The liquid flowed out like water from a faucet and it got all over his lips, throat, and nose. But unlike a human's, Rumina's anus really did smell like sweet nectar. It seemed to give off pheromones to attract a man and it called out to Kazuki's male desire and tongue.
Unable to resist the heart-pounding feminine attraction, he stuck his tongue out with bloodshot eyes, pressed his lips against her, and sucked at her flesh.
"Slurp, slurrrrrrrrp~~~~~!"
"Fgheeee!? Nhee, hyahhhh!!"
Just as plenty of nectar flowed into his mouth, the sucked-out hole trembled longingly. No, not just the hole. Her butt, her lower body, and her entire restrained body jumped wildly and pressed her anus against his lips.
"Kheeee! Nhah, hnyahhhh! Wait, Onii-hyan, Nod thad! No, nyahhhhhh!"
Rumina was tied up, but she intensely grinded her hips in an infinity symbol to press her widened anus against his tongue so he would lick her. The feeling of his tongue, sticky with saliva and her own fluids, caused her to produce even more nectar and to lift her hips in ecstasy.
She bent all of her toes like she was trying to grab something and she repeated the action with each new movement of his tongue. The only reason Kazuki did not stop his anal cunnilingus was Karen's instructions.
"That's right, Kazuki-san. Once a girl starts enjoying it, you can ignore when she tells you to stop❤ Lick her more and harder… Lick and suck at her melted ass pussy."
"Oniiii-hyaaaaaahn! Nhah, ahh, heeeee!"
Rumina cried out in protest when she heard Karen's instructions, but Karen held his head in place and kept him from lifting it. He had no choice but to continue the deep kiss of her anal flesh and continue stirring her up inside. And then…
"Nghhhh…kwaaaaaahn! Ahh, ohhhhhhhh!"
When he stuck his tongue in a little deeper and worked to stir up the thick juices inside, she cried out again and her wildly-moving hips twisted to escape his face. When he wrapped his arms around her hips to hold her in place, his fingertips gently touched her hidden lips.
"Hgyhhhhhhhh!? Ngh, hyahhh…ahee, haheee…"
This naturally left his fingertips soaked with a sticky wetness that felt like sticking his fingers in a bottle of lotion. Her hot and damp sexual flesh showed its hunger by letting out tons of obscene drool. Simply tracing his fingers along the inside of the inner labia greatly increased the quantity.
"Hee hee. Well done, Kazuki-san. You're really good at this. Can you continue just like that? I'll give you an example to follow, so just do this…hee hee…hee hee…"
Just as he heard Karen's happy voice, he felt her hands gently rub up along his butt and spread the cheeks wide. He started to raise his head to look, but he felt something else before he could.
"Lick…slurp, lick…"
(Nghhhhh!? Kwah, ahhhhh!)
Karen's lips sucked at his anus and her thick, saliva-covered tongue pushed inside. The soft and heated tongue that had given him kisses and blowjobs now licked at his ass and moved deeper. That alone was pleasant, but…
"Nn, hee hee… Lick, lick, slurp, lick…"
Her tongue was abnormally long, so it quickly found his prostate and she voiced a sadistic laugh while forcibly pushing at and kneading that spot.
(Kwaahhh! That's…too much. No…ahhh!)
His lips and nose were surrounded by the melting pleasure of Rumina's juices and his hips were about to give out from the incredible pleasure of Karen's tongue in his butt and on his prostate. His erection was entirely untouched, but the prostate massage caused his balls to rise, the sphincter to loosen, and semen to push up into the urethra.
"Nbh…lick, kiss, lick…hee hee…"
"Ahh, ahhhh, akhhhh…lick, lick…"
"Nheeeeee! Hyah, ahyahhhh! Ahee, haheee!"
Karen gave a sadistic laugh. Hearing that, Kazuki cried out in agony while continuing to use his tongue. Receiving that, Rumina kept the indecently sexual moans coming. Kazuki did not stop rubbing her sexual slit while thoroughly licking at the other hole. The stimulation had Rumina moving her hips wildly around and squirting fluid from her crotch with enough intensity to wet Kazuki's palms and arms instead of just his fingers.
"Nhh, lick… Ohay, hum, hum… Nn, pwah…cum❤ Both you perverts need to cum from having your ass licked!"
Karen quickly pulled her tongue out as she said that and the stimulation robbed Kazuki of his last bit of resistance. And a moment later, she reinserted her tongue and applied pressure to his prostate.
"Nwohhhhhh! Hh, hghhhh, nnhhh, lick!"
His mind went blank, a tingle ran up his spine, and he too stuck his tongue in deep.
"Nhee, hyahhhh❤ Ahh, no, ahhhh….nhahhhhh!"
When his spread tongue pressed up against the sexual flesh inside her, Rumina's back hopped up even more than before, her hips trembled, and a warm liquid erupted from her urethra. At the same time, she gave off a strong bitter-sweetness and a lewd feminine scent that invited male desire.
"Nhahhhhhhh!! I…I'm sorry! Ahhhhhh!"
As she shouted, it actually gained intensity and wet Kazuki's hands as he rubbed her crotch. The scent only grew stronger.
(————! Is this…Rumina's…oh…ahhhh!)
He thought she might have squirted, but the distinctive scent made it clear this was Rumina's urine. Seeing what this younger-looking girl should have kept hidden from anyone, his arousal reached its peak. And when it hit him that it was his anal cunnilingus that had made it happen, he felt a pleasant sensation throughout his anus that Karen was caressing.
"Gh…ohh, ahh…kwahhhh!"
With Rumina's piss all over his palms, Kazuki reached his limit as well and ejaculated all over the bedsheet. The large clumps of semen audibly shot out and their scent mixed with Rumina's pee to produce a chestnut flower smell.
"Nbh, lick…pwah. Hee hee❤ Kazuki-san, you came, didn't you? You couldn't help but let out your semen when I licked your prostate, could you? And there's so much of it…"
"Ah…ahhh…hghh…"
Karen rubbed the penis head that was jumping around and releasing its milky load without anyone having touched it. She also scooped up the milky clumps that had splattered on the sheet. He could not see, but he heard the squishy sound as she kneaded it in her hand.
"Once with me, once with Rumina…and now this. That's three times today, but it's still so thick… Hee hee hee. This is a promising sign for the future… Ahhh~…nmh…"
The next sticky sound was probably her slurping up the semen. But she was not hogging it all. She released Rumina from her tail and used the end of that tail to suck up the leftover semen from the sheet.
She gave a satisfied sigh, but Rumina was lying flat down and twitching after pissing herself and orgasming. She had been untied, but it did not look like she could move. Seeing the girl's soaking-wet pussy defenselessly exposed filled Kazuki with lust.
"…Oh, ahhhh…"
His rod had started to go flaccid after ejaculating, but it quickly grew big and hard once more, several pulsing veins bulged out, and it sprang up with enough force to slap his stomach.
"I should have known. Three times wasn't enough for today, was it? Hee hee. That's perfectly okay❤"
"Ah…K-Karen…-san… Kh, ahhh…ahh, hh…"
Karen moved up behind him and pressed her large breasts softly against his back. That sensation made his erection even harder and the sensitive head glistened lewdly.
"Okay, just relax… Let's put that inside her, okay? Just jam it inside this loli succubus's melted ass pussy. Hee hee, you're clearly ready to go. Your cock and nipples are so stiff and hard. What a shameful boy❤"
While embracing him, she used one hand to rub his chest while squishing and kneading his nipples. She used the other hand to hold the base of his erection, aim it toward Rumina's butt, and stop it at the perfect point just before touching.
"Ahhh…Karen-san, um…I can't…do it yet? Gh…"
But when he tried to move his hips, her hand gently stopped him. When he looked back at her resentfully, she gave her usual teasing smile, kissed his back, neck, and ear, and whispered to him.
"I'm not going to listen to you beg. Now, say it… Say you want to fuck my little sister's melted ass pussy… Say you want to pump her full of semen to make her yours. Say your perverted cock can't wait any longer. And say it cutely♪"
"~~~~~~~~~~~ …Ah…p-please…let me fuck your little sister's…"
Laughter rang in his ear like it was mocking his hopeless lust. The sadistic laughter and gentle touch on his crotch led him to move his lips and form the words his male desire demanded.
"Please let me fuck…Rumina's melted…ass pussy. I want to…pump her full of…semen! And make her…miiiine! My perverted…perverted cock can't wait…any longer. Please let me put it in her!"
His hips trembled, his urethra loosened with each word, and precum dripped out. Karen rubbed that all over the head and spoke with shock in her voice.
"You…perverted lolicon masochist❤ Well, fine. A masochist like you has some nerve doing something so sadistic, but…please use my little sister to work off your lust. Go♪"
"Hghh…oh, ahhhhhh!?"
As soon as Karen pushed the head against the anus with the force of a light kiss, Rumina's hole opened wide and took the penis inside. The inside was so wet that he slid right on inside while it softly tightened on him, and the multiple sections seemed to devour the rod as it was sucked further and further inside.
"Khah…ah, nhhh…hah, ahahhh…"
"Hee hee… How do you like Rumina's ass? Not that I need to ask. One look at your melted face tells me it's rubbing your cock and trying to suck out all your semen. C'mon, stick it in deeper."
Her sweet whispering made his earlobe tingle and his hips tremble. But not even the anal flesh licking and sucking at his penis provided as much pleasure as the stimulation from Karen as she pushed at his hips to get him to go deeper. The tip of her tail transformed into the shape of a prostate massager and inserted itself in his ass.
"K-Karen-saaaaan…hgh, ohhhhh…"
It was not hard. In fact, the tail was soft and pliable. She used that to supply the perfect amount of pressure to pry open his anus, insert it, and massage his prostate. The stimulation made him thrust up his hips, digging his penis deeper into Rumina's sexual hole. The head spread wide to scrape at the inner flesh and fill the depths of her body.
"Hghh…nheeeee, hhahhhh…hahee, nhee❤"
Rumina had been untied, but perhaps due to the previous orgasm, she made no attempt to escape and even writhed in pleasure as Kazuki violated her ass. She was in the same pose as when she was tied up, but she was sticking her butt out behind her and twisting her hips so his flesh rod would reach even deeper inside her.
"Hee hee hee…Rumina? Tell us how you like Kazuki-san's cock."
Karen only whispered from behind her, but Rumina seemed to have heard over her moans of pleasure. The little sister succubus's wings moved longingly, she indecently wiggled her hips around, and she sprayed love juices from both holes while nodding repeatedly at her older sister's command and turning back with a melted expression.
"Hh…i-it'sh…the besht…the besht…"
Her previously bratty eyes were drooping and wet and drool flowed out from her half-opened lips which she could not fully close. Her pink tongue wriggled around like she was giving a blowjob in order to inspire further male desire in Kazuki and heated breaths endlessly flowed from her mouth and nose.
"Onii…hyaaaahn! Onii-hyan's hock…rock-hard cock! It's making my ass…all wet and melted… Nhah, ah, ah, ahhh❤ No, I'm cumming…nkhhhh!"
Her voice was scratchy, her entire body twitched, and her ass continued to softly bite at his rod. But whenever Kazuki thrust his hips forward in the slightest, her expression would twist tearfully, a wave of motion would pass through her entire body, and she would convulse intensely.
"Oh, dear, dear. You came, didn't you? What an indecent masochist succubus you are, Rumina. Hee hee."
"Hyah, hhhn…ah, hee…id's drue…I'm…I'm a masohisd! I'm an ass masochist succubus! Hkhhhn❤"
After shouting that, Rumina stuck her butt up, shook her lower body, squirted from her crotch once more, and spread her legs wide while on her knees. The convulsing of her legs would not stop and her arms pulled on the sheets as they folded up below her from the sensation of climax.
"Nhah, ahhhhh…I'm cumming…ahhhhh, I'm cumming again…ahh…"
(…Kh, ahhh…Rumina's so damn hot…)
Watching her experience this much pleasure made him forgot all about Karen penetrating him. His rod expanded, his lower stomach grew hot, and he reached out toward Rumina's small butt as she writhed in orgasm. He only meant to gently stroke her, but that must have provided quite a lot of pleasure because her adorable voice cried out and she completely crouched down on the bed.
"Hee hee… C'mon, Kazuki-san♪ Feel free to enjoy this. Enjoy every bit of this girl's lewd flesh… Just pound her ass❤"
Kazuki was so charmed by Rumina's sexuality that he had come to a stop, so Karen whispered sweetly in his ear. When she struck his prostate like a whip on a racehorse, his hips jumped up, he leaned over Rumina, and he pounded his hips into her.
"Ngh…oh, ahhhhh! Hahh, khhhh!"
"Oh, dear. You're so cruel, Kazuki-san. You're so much bigger than her, so when you rape my little sister, you completely cover her while you bury your cock deep inside her."
He would have said that was her fault, but thanks to the pumping of her tail, his mind was blank, his back tingled painfully from all the pleasure, and he pumped his penis in and out with the base throbbing.
"Nhghhhhh! Heee, hghhh, ahhhhhh!"
Rumina's hole was stretched wide and the pink inner flesh sucked at his hard male spear so much it pulled out a bit when he did. Her tight anal flesh was kept wet and sticky by the love juices flowing out, so his rod was surrounded, stroked, and licked by a melting sensation.
Rumina was not doing this consciously; this was the sensation of the sexual organ a succubus was born with. It endlessly increased Kazuki's pleasure and sucked at him to extract all of his male desire.
(Ahhh… I'm not going to last any longer… I'm going to cum in Rumina's ass… Ghhh!)
"Are you at your limit? Hee hee. Fine then. …Cum for the fourth time today."
As he madly thrust his hips, Karen embraced him from behind to assist with the motion and to bite his earlobe while whispering to him.
"C'mon… Squirt, squirt squirt~~~~❤ I'll even rub you here on your ejaculation switch you love so much. Rub, rub, rub, rub♪"
Her pistoning hit his prostate and all the pleasure seemed to gather in his mind so his thoughts flashed in and out until his mind went blank. And the pleasure reaching his brain gave an intense command to his lower body: fill up the girl before you.
"Oh, you're about to cum, aren't you? Your cock just gave a jump. Go ahead. You don't need to hold back. …C'mon, cum. Cum. Give into the pleasure and squirt it all out. Squirt."
"Hgahhhh! Ahee, nghhh…kwahhhhh!"
Karen whispered the onomatopoeia for ejaculation, included the perfect words to tickle his masochistic desire, and pressed her tail forcibly against his prostate as a finishing blow.
"And that…should end it❤"
The tail dripped a sticky liquid, the end opened up, and it sucked at his prostate like it had his penis so many times.
"Hghh…"
The inside of the tail sucked at his prostate like it was a penis. More than that, the fine internal folds pressed against his inner flesh and gently massaged it.
(Wha-…? This is…too much!)
He had never experienced or even imagined this and he never would have if Karen had not done it here. An incredible storm of pleasure surrounded his body. A sweet wave throbbed from his toes, to deep in his ass, and then up to his brain in a flash.
"Ohhhhh…ohah, hhhhhhh!"
The dam burst and his hot male desire erupted out.
"Nkhhh…hyahhhhhh!?"
As if he were trying to draw out Rumina's sexual cries, his penis throbbed like a pump and filled the depths of her ass with so much cum it was hard to believe this was his fourth time.
"Hghh, ohh…ahhhhhh…hahh, hhhhh!"
The pleasure pushing up through his urethra was so great he thought it would fry his nerves and his back jumped up several times. Each time the white male desire burst from the tip, her anal flesh tightened rhythmically to stroke his penis from the base and suck out every last drop of semen. That motion filled the little sister succubus with her own pleasure, so her throat trembled on and on.
"Nh, ah, ahahhhh…hahyuhh, nhh, nhah…kwahhhn!"
With the hot liquid fully coating her anal flesh, Rumina clenched the sheets and let her body convulse as Kazuki's body pushed down on her. Each time his rod throbbed, her butt pushed back up against him. That movement and the movement of the inner flesh squeezed out his semen while her back twisted and bent.
(Wow…ghhhh… She's going to take it all…kwohhh…)
He was leaning over her, violating her, and pumping her full of his seed, but for some reason, he felt like she was devouring him. But his rod remained hard as her anal flesh stroked it, Karen's tail continued audibly sucking inside his own ass, his balls trembled and rose on their own, and the entire sex organ shook like a pump to rapidly produce semen.
"Hgh, khahhhh! K-Karen-san, I can't-…nhhhhh!"
He tried to tell her he could not keep doing this, but cold laughter rang in his ear.
"Hee hee… Don't be silly. You're still nice and hard."
"That's because-…nh, ahhhh!?"
Before he could say that was because the two of them were stimulating him, the tail enema sucking at his prostate began to intensely pump in and out.
"Aghhhhh!? Wait…Karen-san…hghh!"
He was not telling her to wait because this was painful. It was because he was about to pass out from the pleasure. If he did not move along with the tail's movements, he was fairly certain the intense stimulation would drive him insane. But moving his hips provided the stimulation of its own penetration, so the rod grew even larger while it stirred up the semen inside Rumina's ass.
"Nkhh, hghhhhh…nhahh, hah, nhahhhhh!"
If that had been unpleasant for Rumina, she would have resisted in some way or another. However, she only moaned sweetly, lifted her hips to ask for his penis, and rubbed her butt against it.
(Ahhhh…I'm sorry, Rumina…Hkh, khh, hahh, hahhhhh…)
Karen whispered in his ear as he continued lying on top of Rumina and pounding his hips into her.
"Yes, just keep that up. This is the only way for a tester to learn his lesson after receiving the wrong treatment and squirting his cum everywhere."
"…U-um, Karen-san… Is this actually-…hghhhh!"
Only then did he realize Karen was feeling great jealousy and anger, but she was not going to give him a chance to argue his case.
"You need to cum another 6 times before pulling out, okay? I'm sure this uncontrollable cock won't settle down until it cums at least 10 times, after all. …C'mon, just keep pounding her ass❤"
"Ahhhh! I-I'm zorr-…I'm sorryyyyy! Kwahhh!"
True to her word, Karen did not stop moving her tail until he really had ejaculated another 6 times. Kazuki had prostate pleasure carved into his entire body while he continued to fill Rumina's ass with cum.
"…Ah…hah..ahh…ngh…hahhh…"
"Excellent work, Kazuki-san. You too, Rumina. You did well."
When Kazuki felt the tail pull out of his anus, his body twitched and he collapsed face up on the bed where he could not move for a while. Rumina lay face down in the bunched-up sheets and breathed heavily.
"What do you think Kazuki-san? Ten times in one day has got to be a new record."
"I…can't think…at all…right now…pant…gh…"
Ejaculating so many times in a row had really taken it out of him, so he was utterly exhausted and his lower body trembled while he lay on the bed. However…
(…Wait. Why did it…end there?)
When that question occurred to him, he focused on how his body felt. He was tired and couldn't move, but he was still fully conscious and only felt like he had completed a long-distance run. After cumming 10 times in a row, he should have been too worn out to think this clearly and he could have passed out altogether.
(Is this because of…Karen-san…or Rumina…? Kh!)
Karen looked down at him from the side of the bed, smiled, gently rubbed his sweat-soaked body, and wiped it off with a soft towel.
"You really did do an excellent job. I meant that as a punishment, but the treatment is showing its effects. Things seem to be going smoothly for now. Thank you very much."
"Oh, I see… Um, how is Rumina…?"
After all the verbal abuse during the anal sex, he found it odd for her to be so nice to him. He chose to approach this carefully and asked that question for now. And…
"That girl is doing quite well… C'mon, Rumina, get up. Kazuki-san is asking after you."
Karen did not seem mad anymore as she tried to get Rumina to respond.
"No, as long as she's fine. ….Wait, Rumina? You can sleep some more if you wa-…"
He quickly tried to stop Rumina when she started to get up, but she slowly crawled over to him and pressed up against him as if tangling her limbs around him.
"W-wait, Rumi-…"
"Nhh…hweh, heh…eh heh heh, Onii-san…Nn~, kiss❤"
Just as he saw her melted expression approaching, she pressed her lips to his.
"Ngh…nnhhh!?"
"Hmh…lick…slurp…nhyahhh…"
Her tongue licked around his lips, stuck into his mouth, and crawled all over everything. The surging pleasure and sweet flavor of her saliva sent his pulse racing and the feeling of her body wrapped round his reignited his resting male desire.
"Nhh…nhah, you're hard again… You can keep going, can't you? Onii-san, give me your tasty…ta~sty cum❤ Fill me up…"
"Ru…mi…agh…wait…khh!"
Life had returned to his crotch, but he had not regained the strength to move his body. That prevented him from resisting as Rumina straddled him and sat with his erection pressed in the valley of her soft butt.
"K-Karen-san! What is with Rumina? …Kh, ohhh…"
He guessed only her sister would understand what was going on. And sure enough, Karen nodded, rubbed Rumina's head, and peered into her eyes.
"Hee hee. Rumina, you're in a total trance state, aren't you? …This is your doing, Kazuki-san."
"Ahh, eh? …M-mine? What do you mean!?"
He did not understand at all, but given the situation, he could only guess that cumming inside her ass had been the problem. However, Karen had made him do that.
(I wasn't trying to-…wait, this isn't the time!)
He knew this state could not be a good thing for Rumina, so he tried his best to push her away. However…
"Oh, don't do that, Kazuki-san. Rumina is in a state of ecstasy, so you need to continue loving her until she's satisfied. Go right ahead."
Karen held down his arms to stop his resistance and she kindly scolded him. He could have brushed off her hands, but he sensed the firm desire for him to stop and asked about it.
"So…will you explain what this is about? What happened?"
"Basically, taking in so much semen hit her with the strength of your lust. It's a bit of a problem that it took that much to reach this point, but it's clearly a much more powerful effect than normal now that it's hit her. We can improve this from here on."
"My…lust? So what will happen to me…no, to Rumina?"
He was worried it would have a negative effect. He was afraid it would prevent him, Rumina, or Karen from living a normal life.
But Karen smiled at his concerned face and shook her head.
"Don't worry. This happens all the time. Haven't you ever experienced it? Sensing a sexual woman's gaze, atmosphere, or scent and getting turned on?"
"W-well…yes, I have…"
When he saw a woman in a miniskirt or low-cut top out in public, he almost always found his gaze following her.
"Right? That is you being affected by their lust…and the exact same thing is happening here. Rumina is enthralled by your charm, so this is the first step toward being a popular guy. …Of course, this will require some compensation on your part."
Kazuki paled at that last offhand comment. He had nearly forgotten, but these two – and likely most of the salon's staff – were succubi.
"Compensation? Y-you mean my li-…"
"Didn't I tell you we don't want that? Don't worry. If it ever reached that point, I would rescue you. …I swear on my pride as a succubus that nothing will happen to you."
He felt like he could trust her when he saw the earnest look in her eyes. But in that case, what kind of compensation was she talking about?
"I'm talking about the same thing Rumina is: your semen❤ I'm sure she'll be satisfied if you pump a little more into her, so be her partner for a little longer, okay?♪"
"—————!?"
He was already utterly exhausted from ejaculating to the limit, so this ridiculous request dumbfounded him and sent a shiver down his spine. But Karen was not joking. She supported Rumina's butt and moved his penis head right against her gaping anus.
"Hh…Karen-san, wait…I'm serious, wait…"
"I have some business to attend to, so take care of my little sister."
Karen smiled and removed the hand supporting Rumina.
"Waaaaaiiiiit! Hahhh, nghhhh!?"
"Nhahhh❤ Hahh…Onii-shan, I love you…I love you…"
Their sensitive flesh rubbed tightly together, plenty of sex juices flowed out in the instant of penetration, and it coated his penis as her flesh wrapped around it. The stimulation caused his balls to rise up, his rod to throb, and cum to push up.
"Nn, nhhh…give me…cum…hurry, hurry…"
Rumina's tail extended to Kazuki's chest and its two ends opened wide.
"I'll help you out… Squirt out lots of cock milk for me❤"
As soon as he experienced the return of the incredible nipple pleasure from when he had been blindfolded, Rumina began moving her hips to ride his dick with her ass.
"Hgwahhh…aghhhhhhh!?"
Kazuki cried out and ultimately offered 5 more loads of semen to Rumina. However…
(Stop…I'll die…I'm definitely…going to die here…ahhhh…no…)
Just as Karen had said, Kazuki moaned in agony, but he managed to endure all of those ejaculations and his rod still stood tall afterwards.