I was doing everything in my power to remain motionless. Had I been truly asleep - and somehow able to ignore everything - I would have rolled out of bed long ago. We both would have gone over if I hadn't kept my stomach rigid, my ass tensed, and my heels dug into the mattress, and that at least helped me re-focus my energy as I desperately fought the urge to cum inside my sister's hot, wet pussy.

I wanted to touch her, wanted to grab that mop of thick, dangling hair and pull, flip her on her back and drive into her until she screamed, her legs opening uncontrollably...