I did not care what my daughter thought, we would talk about it later, right now I wanted him inside me, so as I licked and sucked, I stripped off unt...l naked, then I rose, towering over him, I pushed him back onto the bed and mounted him, feeling every muscle and sinew, if any such parts existed inside me, as it had been years since any man had penetrated me, but this was something else beyond believe, I was cumming on my sister's boys cock, and it was delicious.I humped and fucked as if in. I played with her tits, sucking her nipples as she massaged my rock hard cock. I couldn't take it anymore, I had to fuck her. I grabbed her and flipped her over, spreading her legs wide I slammed my cock into her wet pussy. In and out my hard cock slid into my step mothers pussy, and she moaned and I was loving it. I grabbed her hips and fucked her like a toy, and I announced that I was going to cum."In my mouth!" she screamed.I pulled out and straddled her face, and she swallowed my cock. Hips slapped against hips, my body shook with each thrust and he just kept driving. I wrapped my legs around his waist and kept time with his lust… loving the feeling and getting lost in the sex. Blaine’s strokes were long, hard and deep and his breathing was ragged, yet he just kept pounding away… a fuck machine of my dreams! His strokes ended each time, grinding against my pussy and clit, rubbing over and over and bring me to an orgasm that left me breathless. My legs stopped his relentless. I see why you don't want Mom and Dad to know about this. It wouldn't be good for Mom's health and Dad doesn't need to hear a story like this about his baby girl. It would probably kill him. I'll try to keep this quiet."Diana's eyes welled with tears. She hugged her brother briefly. "Thanks, Dan. We're going to have to leave soon to return to Washington. I want to tell everyone goodbye before we leave. And try to remember to call me Diana!" she chided at her brother.She reached up and kissed her.