When Susan came back to her senses, she saw that Alan still hadn't climaxed. His dick poked out as straight and true as a ruler (for better or worse, he didn't have much bend in his penis). Her natural instinct was to get up and use her lips and tongue to make sure he got his satisfaction and then some, but she was too late.
"MY GOD!" Susan exclaimed, as soon as she realized what was happening. "Tiger, are you starting to fuck Akami's ASS?!"
Indeed, that was exactly what was happening. Akami was again on all fours with her face pointed right at Susan, and Alan was lined up behind the nurse's toned and firm butt. They'd spent about five minutes getting past the difficult insertion of the bulbous cockhead phase while Susan was passed out. He still hadn't pushed in beyond that, but he knew the rest would be easily in comparison.
Akami smiled smugly at Susan and said to her, "Now that you're back with us, you'll be glad to know that Alan rated your titfuck a three."
"Only a three?" Susan said in a crestfallen tone. "But Tiger! I put so much effort and love into it."
Alan pointed out, "Don't worry, Mom. Remember, we're not measuring enjoyment; we're measuring chafing. Personally, I loved it. Thanks, Mom!"
She closed her eyes and smiled widely. "My pleasure! And I do mean that in a very literal way." Then she looked again at what was going on and frowned. "But what in tarnation is going on here?! Tiger, your powerful cock is IN her ass! Her ASS!"
He chuckled. "I know that."
"But it's just so... improper. Unholy, even!"
Akami was greatly amused by the "unholy" comment, but tried not to show it. She said in the best academic tone she could manage, "Susan, we're on to our next test. We're about to try the much more chafing assfuck. Alan just told me that you've never done this before, so you should leave this to us professionals. You have to know what you're doing here or you could get hurt."
That wasn't really true, but Akami felt like Susan had been stealing her thunder a bit due to her sheer enthusiasm, cocksucking skill, and her outrageous curves, and she didn't want Susan to outdo her by getting her ass fucked too. She didn't care if Susan did it any other time, but not right after she did it.
Susan was so surprised that all she could do was open and close her mouth, unable to find any more words to say about what she was seeing. On the one hand, she desperately wanted to be on the receiving end of Alan's anal fuck. But on the other hand, her use of the word "unholy" was a reflection of her true feelings. Her family and her parents had raised her to think that anal sex was a grave sin and even some kind of unnatural abomination. Recently, she'd started to fantasize about getting fucked in the ass, and talking to Suzanne about it had helped her attitude, but that had been dealing with it in the abstract. To see it happening right before her eyes positively frightened her, as well as greatly aroused her.
Akami turned her head around to Alan, and said, "Now that you've had a little rest, and we have an eager viewer, I think it's time. Oh, do you have a condom?"
"Oh, right." He wanted to kick himself, because he'd forgotten to use a condom yet again. He had a lot of trouble with that.
There was a delay while she got a condom for him from her purse and he put it on. But soon, Alan was lined up behind her again and she said, "I'm definitely ready. Just push that big monster in slowly."
He did so. Akami's butt was very tight, even with all the anal lube they were using. He complained, "Dang. That's an eight on the chafing scale at least. Tight!" But he continued to thrust in and out of her asshole.
Before Akami could reply to his words, Susan complained to Akami about something Akami had said a minute or so again. "'Leave this to us professionals?' What does that mean? If I may be frank, you're not exactly acting like a normal nurse."
Akami shot back, "And Susan, you're not exactly acting like a normal mother. However, we're both doing all we can to help him out with his problem, aren't we? And I won't beat around the bush. I'll admit that I'm enjoying- ehhh!"
She was interrupted because Alan abruptly pushed in deeper. "Christ! Susan, your son's cock is positively HUGE!"
Susan beamed, and for a moment forgot about her anal sex worries. "Don't I know it?"
Akami said, "You think it feels thick sliding between your lips? Just wait until it reams out your asshole!"
Susan's worries came flooding back. She stared at the last couple visible inches of Alan's shaft with great dismay. How IS that going to fit into my ass? Now that I'm committed to giving my entire body to him, that means it's just a matter of time before he's shoving his baseball bat of a cock in there. It's just SO BIG! And Akami's ass is so tiny!
The voluptuous mother sat up and clutched at her ass cheeks. She swiped an index finger through her copious pussy juices and then pushed the finger into her anus. Oh my! That does feel... interesting, and I like it when Tiger pokes me back there, but that's just with a finger. I'm not ready to do even two fingers, but to simulate Alan's fat cock I'd have to put all five in! There's just no way! But look what he's doing to Akami. I see it with my own eyes, but I can't believe it!
Akami huffed and puffed, "Phew. Boy. Let's stop there for a minute. Are you all the way in yet?"
"No, I don't think so."
Akami resumed, "Damn. Where was I? Oh yes. Susan, I'll admit I'm having fun in the process, but is that a crime? Of course not. Those who are helping and generous also receive much in return. Don't you agree? ... Alan, I think I'm ready. Try pushing in another inch."
He did so.
"UNGH! Fucking hell! That hurts! So damn tight. I thought we got over the hard part when your cockhead got in."
"There's just a little more to go," he said encouragingly. It was true too.
Susan gasped and held her breath. Dear Lord! Lord, please give Akami the strength and fortitude to handle my son's huge cock! Help her anal muscles relax. I remember Suzanne saying that relaxation is the key. Tiger, please! Take it easy on her! Don't hurt her! She continued to poke a lubricated finger in and out of her own asshole, while playing with her clit with her other hand.
As Akami recovered and adjusted to his girth deep within her, Susan also calmed down a little bit. But still, after Akami grunted when Alan pushed in a little more, the sex bomb mother exclaimed, "Stop! It's too much! Tiger, your cock is just too thick and long!"
Akami said with chagrin, "Susan, I can handle it. And remember, we're conducting an important scientific test. Do you really want me to stop? Or do you want to see Alan suffer from brutal chafing?"
Susan moped, "Well, no. We can't have his cock in pain. Of course I want what's best for him." She paused and gazed in wide-eyed wonder all over again at the sight of Alan's erection sticking so deeply in Akami's butt. Then she snapped back to the conversation. "I'm, uh, sorry, Akami. I apologize."
At that moment, Alan gave another push, and his thick pole finally bottomed out. Both he and Akami sighed with relief.
Akami confirmed what he'd done by shouting, "That's it! It's all the way in! God! So FULL!"
Again, Susan got lost momentarily while she watched that happen, and it didn't help that she was busy playing with her own pussy and ass. But then she asked, "Son, how does that feel? Do you like it?"
He replied, "Mom, it's seriously INTENSE! So tight! So fuckin' tight! Right now, I can't really say it feels good, 'cos it kinda hurts too. But I know from fucking Aunt Suzy's ass that it's gonna get a lot better soon, once I start thrusting in and out. Oh my God! Then the pleasure... it's just INSANE!"
Susan bit her lip. She was more than a little envious of Akami right now. Son, what about your big-titted mommy? Maybe you should fuck her ass too? I know it's your right and even your duty to fuck the hell out of your nurse's tiny little ass, but please don't forget me. I want to feel insane pleasure with you too!