I fucked her that way for nearly five minutes. After that, as my cock went inside her, suddenly she jumped to sit, held my buttocks with her hands and...kept it pressed very hard to her pussy not allowing me to take the cock out of her vagina. She made such a shrill as if of an electric hooter as she crushed my cock inside by tightening with her vaginal muscles. She nearly fell out of the cot thrusting her pussy forward as if to get my entire body into her vagina. I knew she was reaching climax. .cheated on me. If I had a body, I would have thrown up in shock as my sister mounted my wife and rammed her cock into her pussy.Violated our marriage.My wife was free to suck as many cocks as she wanted, even my sister's, or let them use her asshole. But to let my sister into her pussy, to risk conceiving a child with an elf who wasn't her spouse, wasn't me...was monstrous.I would never slide into a hermaphrodite's pussy with my cock. I would never cheat on my wife. And she did it. With my. Marty whispered, "you like?" I nodded in the affirmative. He was uncut and allowed me to reach behind Marty and stroke his cock with Marty between us. His lover joined in the play and we began stroking each other in the shower. He and his lover were both Dutch, in their late thirties, muscular and without body hair except on their head. Their English was broken but that mattered not. I was interested in their uncut cocks. It was decided somehow, we would head for Marty's room where we would get. "Do you think it will work for me if I try the same thing?" You might as well try it. But you should be naked first..."In seconds, Curt had stripped out of all his clothes. If Carissa's story was actually true, the only way he would ever be at ease with himself was to throw caution to the winds and try what Carissa had done. If it didn't work, there wouldn't be any ill effects. But if it did, Curt would have his fantasy fulfilled and would be the woman he had always wanted to be.Carissa led.