It was like my sister didn't hear me. I knew there was no way Beth was on birth control. Here I was with my bare cock buried inside my sister's pussy. Beth wasn't going to unlock her legs. I fed her a few more strokes and then I unloaded. I sent hot streams of my cream deep into my sister's belly. Beth's eyes lit up when she felt the heat of my cum enter her body.
"Cum in me Tommy!" My sister was shouting.
That was exactly what I was doing, right or wrong. I dumped all my hot oils into my sister's body. I could feel Beth working her pussy muscles. She was attempting to milk every hot drop of my baby seed from my body. We must have gone another fifteen minutes before I started going soft. Beth finally unwrapped her legs from around my body. I hadn't had a fuck session like that in a long time. That much was for sure.
I pulled my dick out of my sister and I fell back onto the bed. Beth moved over and kissed me over and over on the mouth. I could feel her tits pressing against me as well.
"I love you Tommy," she said.
I frankly didn't know what to say. It all came clear right then. I was stupid for fucking my sister like that. I hadn't even used a rubber. I hated to think what might happen down the road. Beth didn't seem to care. She actually wanted to go again. I didn't think my cock was up to it, but Beth wouldn't take no for an answer. She wrapped her big tits around my cock and started to massage my rod. I was surprised to find my cock getting hard once more.
Beth then got on top of me. I felt her hand holding my cock. She guided my dick to her hole and then she sunk down on me. My cum had lubricated her pussy and I slid right in. We went right at it once more. I brought my hands to her tits and I rubbed my palms against her large nipples. That seemed to drive Beth crazy. I then brought my ass up from the bed and I pumped my erection into my sister again.
Beth just seemed like she couldn't get enough cock from me. I just hoped I could hold up a second time. My sister rode me hard. She was bouncing up and down and it seemed like she needed me to cum once more. I didn't think I had anymore in the tank. My sister proved me wrong. She just kept slamming down hard against my mid-section. I somehow managed to give Beth another load of my sticky cream. Granted it wasn't as much as the first time, but I did cum again.
Beth just rested on top of me and continued to use her muscles to get all my love load out of me. Once we finished we had to put all the sheets in the washer as we had love stains all over the bed. We then hopped into the shower together. I think Beth wanted to go again, but my cock was all raw from the two lovemaking sessions. It did end up that we fucked most every day that summer.
I never once used a rubber and I was worried the whole time. Beth insisted that she wanted to feel my bare cock rubbing her against pussy walls. She also loved feeling the heat from when I came inside her. Don't ask me how, but I managed not to impregnate my sister.
It was time to head back to school. Beth said she wanted to come visit me as soon as was possible. I had to wait some weeks until my roommate went home to visit his parents. Beth drove down that weekend. Over the summer my sister had managed to drop some weight. I have to say she looked so much sexier. Needless to say, we ended up fucking that whole weekend together.
You could say my sister is a nymphomaniac. She just can't get enough of my cock. We did it in every conceivable position. Beth even offered me her ass for the first time. God, was she tight back there. She was also screaming as I filled her bottom with my thick erection. When Beth gets home she is planning on getting fixed. No sense in taking more chances. It looks like I will be fucking my young sister for the foreseeable future.
