Not very quiet

Cassie was asleep in a minute. After twenty minutes, I couldn't get to sleep with a hard-on and a warm soft woman holding my arm and hand under her boobs, even if it was my sister.

She stirred and pulled my hand up to her breast, her hand over mine. She squeezed my hand, which squeezed her breast. Cassie moaned, and arched her back, bringing her ass in contact with my cock. She squeezed again and this time started rubbing her ass up and down my shaft. I could feel her nipple through the tee shirt.

She whispered, "Oh, David!" She must be dreaming of fucking her ex. Then she slid my hand under the shirt and put it on her bare boob. Now the nipple drilled into my palm, and her twitching ass started going faster.

My eyes went wide with fear, because I could tell that my cock had escaped my boxers and was rubbing bare against her panty-clad ass.

"Oh, David, fuck me," she moaned as she moved her hands to pull down her panties. Then she reached behind her and grabbed my cock, stroking it a couple times before she lifted a leg up and pulled it toward her sex. I was frozen by her actions. When she tucked me into her very wet pussy, she pushed her assback onto it, pushing my cock a few inches inside. "Oh, David, your cock is wonderful!" Now she started fucking me.

I was lost in lust. I grabbed her boob, squeezing it firmly and rolling the nipple between my fingers. The moan she let out was so sexy. Then I started thrusting into her as she fucked back.

I was full on fucking my sister! I couldn't believe it. I thought I should be waking her up to stop her, but I couldn't.

"Oh, my God, David! Your cock is so perfect inside me! Fuck me like the slut I am!" Somehow Cassie was still asleep, fucking my brains out.

I dropped my hand down to her pussy and found her clit. It was so slippery with her juices that I had no trouble rubbing it as we fucked. God, her pussy felt good, so hot and juicy.

I could feel myself getting close to orgasm, my balls starting to tighten, when she shouted, "Oh, my God! Yes! Yes! I'm coming! Fuck!" Her body doubled its speed, pounding back into me as I thrust hard and fast into my sister's tight pussy. Her inner muscles squished my stiffness inside her, and I couldn't hold back. I growled over her head as I spouted off deep inside her. The taboo nature of fucking my sister made me cum forever, dumping buckets into her womb. Finally Cassie slumped, turning slightly away from me into the bed, and I slipped out of her hot slit. I quickly put myself back in my boxers and rolled away from her.

"Thanks, John," she whispered as she drifted deeper to sleep.