Literotic asexstories – His Sister's Girlfriend by angstboy,angstboy
Sarah lay on the doctor’s table with her legs in the stirrups, holding James’s sister’s hand, clenching as if for dear life.
“You’re sure?” she asked, a note of anxiety in her voice.
“Of course,” Dr. Madison smiled. “Especially since James is significantly larger than the average male, I don’t think it will be a problem at all.”
The doctor pulled a pen out of her pocket and made a small mark on Sarah’s stomach. “This is roughly where your cervix is, James, come forward.”
James shuffled forward, Dr. Madison’s hand still gripping his rock hard cock. The doctor guided him between Sarah’s legs, letting him go with a long caress from base to crown.
“Now James, I want you to place your penis on Sarah’s stomach, so that your testicles are just touching her vaginal lips, that should approximate full insertion.”
James did as the doctor told him to, enjoying the feel of Sarah’s taut stomach underneath his cock as he shifted slightly to line himself up. He could feel her pussy lips against his balls, warm and still slightly moist from the lubricant they had used for the ultrasound. His cock reached almost to the dot on Sarah’s stomach, perhaps an inch or so away from it.
“Excellent,” Dr. Madison said. “Now we do want to be certain that his ejaculate will reach the cervix, so James, could you perhaps masturbate for us now?”
James pretended to be surprised. He had planned this out for weeks now, ever since his sister Alex and her partner had come to home to ask if he would be a sperm donor for them. James had always had a crush on his sister’s girlfriend. He didn’t like the word, but since it had started when he was sixteen it had seemed appropriate at the time. Even in high school Sarah had been gorgeous, and now that she was 21, her body had come into its own. Her breasts were large, easily an F cup, and she and Alex had joked that the only person in school with tits larger than Sarah had been Alex. Other than that, the two women were almost complete physical opposites.
Alex had always been terrified of becoming fat (although James didn’t know why, their mother and two aunts were both in great shape), and as a result had spent almost every day of the six years since her 16th birthday dieting and at the gym. Her arms and legs were muscular, she could almost be described as ripped, and her stomach was flat and solid as a rock. Even her ass was toned, and James’ had spent many a night stroking his large cock and thinking about sliding it into his sister’s amazing tight ass. Her blond hair was currently cut short, framing her elfin features as she held onto her partner’s hand.
Sarah was not as concerned about her appearance as her partner was, and although she stayed in shape, maintained a smooth curvy figure. Her red hair set off her tanned skin (just because she didn’t go to the gym religiously didn’t mean she didn’t get outside and stay in shape), and she often wore low cut shirts to show off her breasts, which she once joked were the only reason she had gotten through college. Josh suspected the fact that her hair helped, too, which she always kept long and was a lustrous, curly auburn, which Sarah said came from her Puerto Rican relatives. She also had a tendency to wear tight pants rather than dresses, which Josh figured was to show off her incredible ass as much as it was for comfort. Where Alex’s ass was tight and toned, Sarah’s was full and round. James had probably spent as much time masturbating to Sarah as he had to his sister, perhaps more. When the two girls had hooked up in college, he had probably masturbated to fantasies of both of them at the same time even more.
Now, if he was careful, he might be able to bring that fantasy to life. And even if he wasn’t careful, he would get half of it. He slid his hand around his cock and began to stroke it, trying to shut out the image of Sarah’s lush sexy body laid out in front of him. After a few minutes, he shook his head and turned to the Dr. “I’m sorry, doctor, I don’t seem to be able to do it right now, this is all a little weird for me.”
Dr. Madison nodded. “I understand, perhaps we could add a little bit of mood? Sarah, Alex, would that be okay with you?”
The two women nodded, and Dr. Madison turned to dim the lights a little bit. “Perhaps, Sarah, you could take your shirt all the way off?”
Sarah looked surprised. “Do you think that’s necessary, doctor? I mean, we’re only doing this for the insemination?”
“I understand, Sarah,” Dr. Madison replied, “But you do know there will be multiple sessions at home, this is simply to make certain everything is going to, fit together, so to speak. And there are a number of studies that show that the more excited a man is, the higher his sperm count, so I would recommend that you do your best to excite him at home as much as possible. We may as well get you used to it now, right?”
Sarah nodded. “I suppose that makes sense, what do you think Alex?”
Alex jumped. She had been quiet for most of the visit, and had said nothing since James had gotten undressed at the doctor’s request. She had always known her brother was large, the girls in school had gossiped of course, but she had not been expecting the baseball bat he had displayed. And when he had lain its length on her partner’s stomach, she had been unexpectedly turned on, and, for some reason, jealous. She had barely heard the request, she had been focused on her brother’s large cock laying on her lover’s body, imagining what it would feel like sliding into her. Into Sarah that was, not herself.
“Of course,” she said, “I think the doctor knows what she is talking about.”
Sarah released Alex’s hand for a moment and slid her shirt off over her shoulders. Her breasts almost overflowed her bra, even laying down on her back.
“Yes, your brassiere, too,” the doctor instructed.
Sarah unclasped her bra from the front and shrugged out of it, the movement making her large breasts wobble sexily. James almost forgot himself and tried to grab one, but held himself back. That would come later, he knew, for now, he just had to let Dr. Madison take the lead.
“Excellent,” Dr. Madison said. “James, is that helping?”
“Yes, doctor,” he replied dutifully. He wrapped his hand around his cock and began to stroke again for a few minutes before turning to her. “I’m sorry,” he said. “I just don’t think I’ll be able to cum from stroking myself.” He laid his cock back on Sarah’s stomach, enjoying the feel of her skin against him.
“I understand, James,” the doctor said. “Perhaps you could use some assistance?”
“I think that might help, yes,” he said.
“Well, then,” the doctor said. “I suppose I could help out this time.”
Dr. Madison move to stand beside him and reached around to grab his cock at the root, pressing her breasts into his back. He almost came at that point but held desperately on, the combination of his sister’s girlfriend’s stomach and pussy rubbing against his cock while Dr. Madison’s full breasts pressed against his back almost driving him over the edge. She began to rub her hand up and down his cock along the top, curling her fingers to make it look to Sarah and Alex like she was actually stroking James, but not actually disturbing where it touched Sarah’s body. Even without the direct stimulation, the butterfly caress of her fingers along his cock made precum start to drip from the tip and pool on Sarah’s flat stomach.
Alex was transfixed, watching the doctor’s petite hand stroking her brother’s massive erection. She could not believe that watching someone stroke a cock, her brother’s cock no less, could be so exciting. She had given up on boys on high school and thought she had never looked back, but something about the animalistic power of the giant member sticking out of her brother’s groin, and the taboo fact that it was her brother’s was combining to send chills down her spine, directly to her pussy. She didn’t want to admit it to herself, but she knew that later tonight she was going to be thinking about her brother while she was making love to Sarah.
“Ah,” Dr. Madison almost purred from behind James. She seemed to have pitched her voice just a bit lower and more breathy. “You see the pre-cum? We have an urban myth that that can’t make you pregnant, but I can tell you that in fact, the sperm concentration can be higher in pre-cum than in the regular ejaculate. I would suggest in your future endeavors that you make certain you don’t miss anything, so be sure to insert the penis as quickly as possible into Sarah’s vagina, do you understand?”
Sarah had already been turned on by the feeling of James’ huge penis resting on her stomach and his balls against her pussy, but the sound of Dr. Madison’s voice sent a thrill through her, and she was embarrassed to realize that her pussy was wet. In fact, it was dripping almost as much as James’ cock was, she was so turned on. She nodded quickly at the doctor’s question, trying desperately to follow her words as she fought off the odd sensation of being turned on by a man, telling herself it was okay because he was going to be their sperm donor, and that it was really the doctor she was responding to. Either way, she knew she was going to be thinking about this tonight when she fucked Alex. And she knew at this point, she was so turned on she was going to fuck her partner’s brains out.
“In fact,” Dr. Madison continued, “I think we should practice that right now, just to make certain that everything will work smoothly, don’t you Sarah?”
Sarah nodded again before she realized what the doctor had just said. “Practice?” she said. “You mean…?” She trailed off, realizing that as soon as James moved his cock to her pussy he would realize how wet she was, and so would Alex, for that matter. She didn’t know which made her more embarrassed, or excited. She struggled to find a reason to avoid that situation. ‘But, I don’t know if I’m ready, I mean at home we have lubricants prepared -“
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