With my hand behind her head I began to fuck her face.While setting up a rocking motion with my hips that drove my cock down her throat I reached for ...er breast and began massaging the tit through the bikini top, pulling the material aside then pinching her stiffing nipple.Mom's hand gripped my cock, her head bobbed to meet every push from my hips. Faster she jerked my cock taking it from her mouth and licking the head as the pressure built in my balls. Finally she relaxed her hold and I. Becky slid one long smooth leg across the back of Nick's thighs and the wet dribbling lips of her pussy touched his hip. She scooted closer, merging her sweet young body into the fuck her sister was getting, her hands sliding up and down Nick's body. She turned his face to hers so she could kiss him. He was sure he could taste his cum in her mouth, but it wasn't too bad. And anyway, she'd given him such a sweet hot sucking, it was the least he could do to thank her."We don't do this with just. .. what you do now." When?" gee I felt dumb."When you're by yourself."Slowly the light was dawning. She couldn't possibly know. Shecouldn't have seen me doing IT? Oh shit what if one of my othernurses had seen me and told her. I couldn't answer. I juts couldn't.I decided to brazen it out. After all she might be referring tosomething else totally different."I don't understand." I could hear the lie in my voice."Oh I think you do." She was not letting me off the hook.I shook my head."Oh you. And finally.....my vagina. I was starting to really get worked up as she seemed to concentrate on these three areas, and when she started scrubbing my slit hard, I found myself rocking back and forth against the sponge. "Butter Cup, you really have to stop moving so much. I have to clean this messy pussy of yours." I flinched at these vulgar words words coming from her mouth. By the time she had finished, it was all I could do to not reach back .