As for me, it was everything in my power to stay motionless. Had I really been asleep - and somehow able to ignore all this - I would have tumbled from the bed long ago. If I didn't keep my stomach rigid, my ass tensed and my heels dug into the mattress, we both would have gone over, and that at least helped me to re-focus my energy as I desperately fought off 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...