I awoke at midnight with my now semi rigid cock still buried in my sisters ass while she slept spooned against me. It had been about an hour since I had shot another load of cum in her tight little butt, and the fourth time that day, but who's counting? Jennie was now ten years old and I was seventeen, and I must have screwed her ass hundreds of times over the last couple years, ever since she persuaded me to do so. She still couldn't get enough of it and, for that matter, neither could I. I stroked her hair and kissed her temple as she snored so softly and contentedly, feeling loved and protected in the intimacy and passion we had discovered together.

I then started playing with her nipple, tweaking it between my fingers. This was one of her favorite things; to have my cock in her ass while I massaged her still small breasts. We had done this enough times to know exactly how to please each other. Jennie stopped snoring and a slight smile came across her face. "Mmm that's nice," she barely whispered, and then squeezed my penis with her sphincter muscles, knowing that would surely make me hard again.

Our mother had been staying at her boyfriends house over the weekend so Jennie and I had been having anal sex even more often than usual. The skin on my penis was raw and sore, and my balls ached, but apparently Jennie was suffering no ill effects. She squeezed my cock once more, her signal that she wanted me to fuck her ass again, and my cock began to respond. She knew from experience not to squeeze too much until my cock got harder, or it would push right out. As she could feel me get hard enough she squeezed at lesser intervals until I was almost completely erect. Now she was squeezing it every few seconds. Then she opened her legs and arched her back onto my cock, which was her way of letting me know she wanted me to move my hand from her tit to her slit. As I did she began to breath more rapidly, my hands smearing the juice around her hairless pussy as I rubbed her tiny budding clit. "Umm keep doing that, ooo yea."

My cock was now as hard as a rock as I pushed it in deeper. We had done this often enough before to know that it would take me longer to cum and the fucking would be more vigorous because I had fucked her so much already today, but that was not a deterrent. Rather it fueled our lust. We were obsessed.

I had now stopped rubbing her clit, being too caught up in driving my cock harder and deeper into her. We once had measured my cock and she was proud of that fact that she was practiced enough to take my full eight inches with no problem and as far as we were both concerned, the deeper the better.

She made a partial motion to roll on her tummy, wanting me to roll with her without taking my cock out. I eagerly complied, knowing she wanted me to be in a position to really drive it into her. Jennie then spread her knees and arched her butt up as I slowly but steadily pushed into her with longer strokes. She was breathing harder, wiggling her little butt just a bit. I pushed it in to the hilt and held it there, her anal ring clenched firmly around the base of my cock. After a few seconds she clenched my hard penis with her ass muscles, and then squeezed it again, knowing this anal massage of my cock would get me going. It worked, and for the umpteenth time I started fucking her ass with long deep strokes.

Jennie reached down to play with her clit. I could feel the tips of her fingers brush against my balls when I slammed forward into her with stronger faster thrusts. My cock kinda hurt from being so raw as I drove it into her, which would only make it take longer for me to cum.

She was cuming now, her fingers bumping frantically against the base of my thrusting penis as she rubbed her clit. "Oh yea, keep fucking, oh I love you, uhhh keep fucking me." Arching her back some more to better allow penetration, she orgasmed again.

Jennie's ass was well lubricated with the KY and large sperm deposits I had put there earlier. She reached back and pulled her butt cheeks apart, spreading her knees as far as possible, wanting to feel the sensation of the head of my cock bumping against the part of her asstube that turns. I was fucking her furiously now, sweating as my heart pounded, thrusting with all I had. Occasionally I would have to pause and catch my breath, firmly imbedding my cock all the way into her tight little ass. Again she would squeeze the base of it with her sphincter muscles, prompting me to continue fucking her. I glanced at the clock on the bed stand; I had been screwing her ass as hard as I possibly could for over 40 minutes now. Finally I rammed by cock all the way in and shot another load of cum, her anal ring against my balls as my cock head pushed against the curve in her colon. Surprised I had that much cum left I kept spurting, then collapsed onto her back still buried deep. Jennie squeezed my cock again with her ass, wanting to milk out every last drop of sperm, as I caught my breath. I told her I love her, but she was already falling back asleep, her grip on my cock loosening, feeling warm and safe with me sprawled above her small frame.

My cock would be sore and bleeding in the morning and Jennies asshole would be red and swollen. We would apply ointment to each others wounds and go back to school, looking for another opportunity to have anal sex with usually no more than a couple days abstinence. As I lay there, exhausted, I contemplated the turn of events that got me into this situation. I knew that screwing my little sister was wrong in the eyes of society, but we both wanted it so much we couldn't resist, and we weren't hurting anyone. I hadn't fucked her pussy, respecting that she wanted to remain a virgin that way. It was her that originally wanted it, not me. As I fell asleep I thought about the first time she seduced me, but that's a story for another chapter.