I woke up in the morning, in the exact same position. I was behind my sister, my arm under her neck, and wrapped across her chest, just under her collarbone. I assumed she was having a bad dream, because her breaths were shallow, and quick. I was about to jostle her awake, when she let a soft little moan slip. At that same moment, I noticed motion from her right arm. It was laying in her lap, and was moving gently up and down. My eyes widened. Was my sister having a masturbatory dream, while I held her? I instinctively started to snake my arm out from under her, as I did my best not to disturb her. I thought it best if I gave her privacy. As soon as I moved, though, she grabbed my hand.
"No, Brandon, hold me, keep me safe, I'm almost done. You promised."she whimpered.
I truly did not know what to do in that moment. I mean, I knew my sister was beautiful, but never thought of her as a sexual creature before this. But here she was, trusting me to help her through this journey, believing with all her heart that she was safe here, so I stayed, still, motionless, and just held her. As her tension built, she kept holding my hand, and lowered my hand to her breast as she toyed with herself. I could tell by her moans that she was getting close to cumming. That is when everything changed. Suddenly, she switched hands, releasing my hand on her breast, and diving that hand down to her pussy. In the same motion, she reached back with her right hand, and started stroking me!
"Oh GOD Brandon, don't move. Just stay there. DONT MOVE... I'm so close."she whimpered. I fought to control myself, as she stroked me, realizing that I was inches from her bare ass. As she squirmed, she would occasionally brush her ass against my cock. Was she doing it on accident? At this point, I really had no clue. But, as she got closer, I felt my blood boiling in my genitals.
I could tell by her strokes that she was trying to get us to finish together. I truly did everything in my power to hold out, hoping that if she came, she would net me go, and I could keep our relationship innocent, at least on my part. Ultimately, though, my plan failed, of course. As my sister worked herself into a frenzy in front of me, she hit the boiling point, and without warning, shoved my cock between the cheeks of her ass as she came.
Apparently, she had gotten herself quite wet, and let it run down to her ass, because when she shoved me between her cheeks, I was instantly in danger of sliding into her ass completely. As she came, the head of my cock could feel her tight little ass pulsing with each wave. I closed my eyes, and tried to maintain control, but as she came down from her orgasm, I got the shock of my life.
"Oh, FUCK Brandon, I'm.. gonna cum again, PLEASE CUM WITH ME..PLEASE!" she cried.