This is a fanfic. I have the Original author's permission to do this, so please enjoy!
(Check out sexgundam666, but if this is the stuff you like you probably have done so already)
Marie's POV:
I couldn't breathe out of shock. There, in the doorway, stood my stepsister only in her bra and panties. My dick was swimming around the bathtub, but covered by the bubbles. I stared at her DD Cup breasts, and at her beautiful ass that was almost fully exposed now. It was one of the biggest asses i knew, and i loved butts.
Startled, I exclaimed "oh my god Sarah WHAT are you doing here?"
"Oh stop making such a huge deal out of it, I wanna bathe too!" She said and started taking off her bra.
Oh god.
"You can't do that! Im already here!" I said, panicked.
"What are you so scared of sis? We've bathed multiple times together!" She said as she was taking off her panties. She turned around and jiggled her butt, just for me. She knew I liked it. And so did my dick. I couldn't argue with what she said, and without giving me time to respond she was sitting in the bathtub.
Thank god the tub was big, easily enough for two people, so my dick, lying across my balls and the floor towards her bare pussy couldn't reach it by a few inches. A single move by her feet though and she would find out.
We stayed like that for a few minutes, only a few words spoken, she seemed tired. Sarah worked part time at bar and was studying at the Uni at the same time. Its very rare that she's home, and it just had to happen now. I felt my balls fill up slowly, getting heavier by the minute. I couldn't keep my eye from her breasts or thinking of her awesome ass. She had her eyes closed, enjoying the warmth of the bath and some of my precum. Yes I was leaking like hell despite not being hard, and it felt very good. It was a hard task not to go hard and let my cock grow into her face.
About 10 minutes into my bath Sarah extended her leg and it crashed right into my balls, now the size of cantaloupes. A shockwave of pleasure surged through me, and I couldn't stop the blood from filling up my pole. Oh god, I was doomed. I had closed my eyes, in fear of Sarah's reaction, but nothing came. I looked up. She sat there with her eyes closed.
My dick was getting harder.
"Sarah?" No response.
She was asleep. Thank GOD. Now, what would I do? I had to move my dick somewhere before it got too long. I cant put it next to her, there is no place. I cant lift it up, then she might see it when she wakes up. I could tit fuck her- no. Stop. That was the horniness thinking. My dick now not even an inch from her pussy and still growing I had an idea. Back in the bathroom stall at school my dick got about 3 feet long, so I thought that if I were to put my balls behind my ass and sit back in the tub, my dick wouldn't reach her snatch. How good it would feel. How nice it would be to massage my cock between those soft asscheeks. How- STOP. I can't think that right now!
I got into the position that I had thought of. My cock was at about 2.5' now, and there was about 7 inches to her pussy. Thank god, it would work out. If she woke up, she still couldn't see the rod because of the bubbles.
I sat there, my pussyjuices trying to escape the prison that my sack gave it, and with a 3 foot cock that shot a steady stream of precum at my Stepsisters snatch. I was lucky that the stream was not strong enough to wake her. I was so incredibly horny, but I couldn't let off with her in the bathroom. Unconsciously I grinded my pussy on my tight ballsack that stretched over it like a tight pair of panties. I stopped when I was close to orgasm, because I noticed. I was on edge. I also had started playing with my nipples, each the size of a thumb, but kept stopping again because I did not do it consciously.
I had to
cum