To calibrate the equipment, I need to establish a base line, and that requires human semen." I just smiled, and said " there must be lots of men who w...ould just love to help you with that project." She blushed again and said " yes, you are right, but what I really need is semen that does not contain any sperm cells." She just looked into my eyes and bit her lip and finally with some hesitation, she asked me if I would provide some samples. I am not sure when or how the subject had come up, but. “Aren’t you coming to watch?” she asked.After the fuss Mel had made that morning about me watching her peeing, even though I hadn’t really seen anything, that was the last thing I was expecting.One of my semi-regular assignations was a big fan of water-sports. They didn’t do much for me but I accommodated some of the woman’s milder fetishes, such as peeing on each other in the shower, because of how turned-on it made her: she’d practically rape me afterwards.Mel’s look hardened to a glare and. “Spread your legs, you fucking slut, you’re going to earn your way tonight, like a real whore.” “Yes, Mistress.” I reply softly in my embarrassment, spreading my knees wide. The latex thong pulls tight, sliding into my twat, leaving my pussy lips almost completely exposed. Nikki pulls out a small pair of scissors and cuts the thong off me with an audible snap and then orders every guy who has money to line up. Brian is first in line. He walks up to me and puts his cock to my mouth, pressing at. “I'm cumming,” she wailed. “Oh, God, baby! Your ass is tight...so close. Gonna cum,” Odin roared. I watched Marie convulse with pleasure, as Odin slammed into her from behind a couple times more. His body stiff, as he came. He rested a second, before pulling out of her ass. I felt her twitch, a bit, as a drop of his cum landed on my leg. She pulled out of me and got down. On shaky legs, Marie began to unfasten the strap on. I watched as Odin cleaned up, then helped Marie. Someone threw a wet.