She was rocking rhythmically on me, grunting with exertion. I could tell she was still on the plateau and was working herself up to another orgasm. I ...quirmed under her, toes curling. I wanted so badly to feel the heat of her cunt swallow me. I’d never experienced something so thrillingly arousing and intensely frustrating.When she started rubbing her clit, I lost all restraint. I started bucking my hips to force her forward so my cock would slip inside. She gave me a swat and carried on. I gently swatted Dani's ass, careful to keep my arm below where Mom could see."Didn't mean to startle you honey," Mom chirped. "Is your sister awake? I'm a little thirsty." Mom knew that my bulk would prevent me from handing her a soda, but that Dani had no such hindrance."I dunno, Mom. Let me check," I replied. I scooted my hand up from Dani's ass and slid it up under her shirt, slipping my fingers around her breast I found her nipple and pinched, pulling a loud, deep groan from my sister's. "Keep your face in the bed. I am going to rip you open baby." With the top third of my dick firmly in her ass, I held her hips tight and rammed her hard. I heard her muffled cry into the sheets and felt her ass instinctively try to pull away. Her ass was dry as the desert compared to her hot lubed pussy. "Fuck yesssss," she turned her face to the side for me to hear her next command. Through clenched teeth and tightly shut eyes she said, "Just ram it. Make it bleed." I pulled out fast and went. ...they are very comfy and cool (a little thin), trouble is through they are pretty see thru when they are wet. I always pick a swimsuit or something colorful underneath. He said, yea, that's cool, I couldn't help but notice. Yea, my heart started to flutter! I think the guy was probably really checking me out. Without being to obvious about it I had noticed quite a nice bulge in his trunks. Anyways,...since he asked me where I got them...we were the only two at the pool bar at the time sitting.