Kat trembled. "Oh god. Sir. I'm going to..."
"You may." Arthur assured her. "Just don't lose count."
"Ahaa." Kat gasped as she clamped her legs together around the vibrator and folded a little as she shook, stumbling forward. Arthur caught her and lowered her to the floor. She twitched and spasmed around the vibrator, gasping when Arthur released the clamps from her breasts and intensified her orgasm even more.
"Lucky bitch." Selene muttered.
Arthur switched off the vibrator and waited until Kat's body fell slack against the floor before pulling it from her panties. She sighed and seemed to melt into the floor a little. She heard, rather than saw, the next spank to Selene's ass but still dutifully counted out "Fifteen." before Selene said, "Thank you, Master."
The next few went the same until twenty-six when Kat finally decided to get off the floor.
"Kneel behind your sister, facing the wall." Arthur instructed.
Kat did so hesitantly, as this put her eye level with her sister's crotch from behind. She wasn't sure what Arthur had in mind, but she wasn't sure she wanted to do it either. She wasn't sure if she would.
"Head down." Arthur instructed. "Look at the floor, and lift your hands up and slightly in front of you, like you're offering something."
Kat obeyed, still more hesitant.
Arthur took her hands and placed them where he wanted them to be, shifting her, so she leaned forward a little more. She didn't look up, even when he put something in her hands. She knew what it was. The vibrator wand. He turned it on and then moved her hands again, drawing a moan from Selene.
Selene was fastened to the wall, spread eagle. Kat was kneeling below her, her face down and her hands raised. She held onto the shaft of a vibrator whose head split Selene's eager slick folds aside and pushed against her clit while Arthur stood back and admired his work.
"Don't cum without permission, slut." Arthur reminded Selene.
"But she had permission." Selene whined.
Arthur spanked her even harder than before.
"Twenty-seven." Kat counted.
"Thank you, Master." Selene panted.
"You will not cum without permission, do you understand that, slave?" Arthur barked as he spanked her again, just as hard.
"Twenty-eight." Kat said quietly.
"Thank you, Master." Selene moaned. "Yes, I understand."
"You are a slave. A slut. Nothing but a cock sleeve, a fuck pet, a fuck toy, or whatever I say you are." Arthur spanked her again.
"Twenty-nine." Kat said.
"Thank you, Master." Selene whimpered.
"You will get whatever pleasure I decide you should have." Arthur spanked her for the thirtieth time.
"Thirty." Kat counted.
"Thank you, Master." Selene agreed.
"You will take whatever punishment I decide you should have." Arthur spanked her.
"Thirty-one." Kat counted.
"Thank you, Master!" Selene shouted.
"You will thank me for whatever pain or pleasure I inflict on you." Arthur spanked her.
"Thirty-two!" Kat said, knowing they were getting close to the end.
"Thank you, Master!" Selene shouted.
Arthur spanked her for the thirty-third, thirty-fourth, thirty-fifth, and thirty-sixth time without saying anything further. Each time Kat counted the smack by the sound of it. She did not look up, and Selene gasped out thank you's to her Master.
"Are you ready to cum, slut?" Arthur asked, holding the final blow back.
"Almost, Master." Selene answered.
"Almost?" Arthur asked. "What's holding you back?"
"Permission, Master." Selene answered.
Arthur smirked and rubbed her ass with his hand, soothing the fire-red marks on her cheeks with their various heart-shaped indentations. He gripped it, and she pressed into the wall at the sensation and gave a breathy gasp.
"Please, Master?" Selene asked.
"Beg for it like a proper slut." Arthur spat. "Tell me what you want."
"Please, Master. Let your slut cum! Let your slut-" Selene gasped as Kat pushed the vibrator harder into her as Arthur used the paddle to push Kat's arms higher. "Let your slut, cum for you. Let me cum all over Kat's hands. Her face. Push her face into my pussy, Master, and watch me cum all over her for you. Record me on your phone. Make me watch it later. Make us watch it later when you force her to return the favor! Do whatever you want with me, with her, with any of your fuck toys, Master! Just let me cum!"
Arthur smirked and turned up the intensity on the vibrator by a notch. He leaned into Selene's ear and whispered. "You have my permission to cum, like the filthy slut you are." And with that, he landed the final spanking.
"Thirty-seven!" Kat called out triumphantly.
"Thank you, MASTER!" Selene shouted as she came so hard that, for a moment, Arthur worried she might rip the eye hooks out of the wall. They held even as she pulled against them, took another breath, and then released a loud, unintelligible scream of pleasure, shaking with her orgasm as it tore through her and offered her no reprieve. She was crying by the end, so happy to have finally reached that bliss. Once it was over, she was barely conscious of Arthur unclasping her restraints and guiding her to the couch where he sat in the center. Selene sat against him on his right side, and Kat sat against him on his left.
After a few long minutes of silent cuddling and peace, Kat was the first to break the silence.
"You..." She said quietly and then tried again a little louder. "You wouldn't really make her do that. Would you?"
Arthur opened his eyes and looked over at Kat, who was under his left arm, cuddling it while she rested against him. "Make her do what?"
"Cum on my face." Kat answered.
"No." Arthur answered. "She was the one who came up with that."
"Is that your fantasy?" Kat asked Selene without looking at her.
"No." Selene answered. "Not really." She hesitated. "It's just... sometimes I get turned on by the most depraved things, and that... was the most depraved thing I could think of at the time. Given how close you were to me and everything."
"I don't want to go down on you, though." Kat said. "I-" She looked up at Arthur. "I don't want you to make me."
"I know." Arthur said with a nod. "To be honest, I was half expecting you to balk at holding the vibrator in place."
"I almost did." Kat confessed. "But I figured, well, it was only fair. I got to cum. She should too."
Arthur chuckled softly at that but agreed. It made sense in its way, he supposed.
"What about Master?" Selene asked. "You still haven't cum once this morning, right?"
"No." Arthur answered honestly.
"Oh, we can fix that." Kat squeezed his arm. Selene did the same. "Will you let us suck your cock, Sir?" Kat asked.
"Or would you rather fuck one of us?" Selene asked, watching his cock carefully for signs of life.
"Or both of us?" Kat suggested. "We could lay on top of one another, and you could switch from pussy to pussy fucking until you're all pumped dry."
"Ooo, that sounds fun." Selene said with a laugh. "Or maybe a bit of both? If we lay on top of one another in opposing directions, you could fuck our mouths and our pussies, in any order you wanted. Maybe tie my arms to her legs, and vice versa, then hogtie us all together."
Arthur was hard by the time she finished that last suggestion, but he wasn't sure how practical that could be.
"On your knees over there on the floor." Arthur instructed. Selene hopped up eagerly. Kat followed though she was not quite as springy in her step. They both knelt, facing the same direction. "Face each other." Arthur instructed. Selene moved so that she and Kat were facing one another, still both on their knees, sitting back on their heels.
Arthur stepped between them, and his intention became apparent as he stood there, his shaft hard and parallel to the floor. He reached down and grabbed both of them by the collars, one in each hand. He pushed his cock into Selene's mouth first, and she took him eagerly. Then he withdrew and thrust it into Kat's mouth, whose lips seemed to part more hesitantly. She took him and looked up at him as her lips formed their O. Arthur brought Selene's lips to his balls, and she eagerly started licking and sucking while her sister worked his shaft.
"That's it." Arthur said as he smiled. "There's my good girls."
Selene hummed happily. "We're your good girls, Master."
Kat popped off his cock long enough to say, "We try, Sir." Then she offered his cock to Selene, who dove onto it while Kat lowered her face and ducked under to get at his balls.
"You're improving." He said to Kat, whose smile he could feel as her lips pressed against him.
Kat and Selene continued sucking, licking, and bobbing in alternate turns. One played with his balls whenever one sister offered the other his cock. Then, for a few brief moments of bliss, they both had their lips on either side of his cock. They ran their faces up and down his length as though stroking him with their lips. Both of them ran their tongues along the underside of his cock, even if it meant touching each other's tongues a little bit.
"Don't stop." He ordered, and they kept going. "I'm almost there." He warned as he reached down and started to stroke himself at the base of his cock. Selene slapped his hand away and took over for him. Kat put her hand over Selene's, and the two pumped him together with their hands and mouths.
"Who wants it?" Arthur asked.
"I do." The girls said simultaneously as they each pulled off just enough to answer.
He laughed. "Put your faces together. Side by side." He instructed, and they shifted beneath his cock until they were pushed together. Each of them had one hand on his cock, pumping, while the other hand lifted one of their breasts up to him like an offering. Their faces were at the end of his cock, Kat's a picture of hesitant anticipation. Selene's a picture of eager desire lit by a bright smile.
"Cum for us, Master." Selene said.
"Yeah." Kat agreed. "Please cum for your girls, Sir."
That did it, and Arthur clenched his jaw tightly as they both felt the veins in his cock throb just before the explosion. Jets of hot white cum splattered out against Selene's face, first hitting her in the forehead. Then they turned his shaft slightly, and the second spurt hit Kat just below the eyes, and she smiled. The third spurt hit her smile and fell over her lips even as her tongue licked up to taste him. The fourth spurt was Selene's, shot directly into her open mouth. Then they alternated back and forth until finally, he was out, and they were both coated. Some of it had gotten into their hair, and they wiped it from their eyes as Arthur stumbled back.
He watched them wipe it, but instead of licking it off their hands, each girl fed it to the other. Kat scooped it off her face and offered her fingers to Selene, who gobbled them like a hungry kitten. Selene scooped it off her face and offered it to Kat, who licked it clean with a blissful look on her face.
"Thank you, Master!" The girls chorused as though they'd practiced and made some silent signal to finally execute their grand design.
Arthur laughed, now officially drained and tired from the morning's exertions. He was going to need coffee. "You're welcome, girls."