If you missed part one My name is John and my sister's name is Emily. We are twin brother and sister off to our freshmen year of college together. Our parents were driving us there in our stuffed suburban. Emily and I were in the back seat and had just discovered how amazing sex with each other was.
"I can't believe I just came in you Emily." I said as I was looking into her glowing eyes. "You aren't on the pill! You could get pregnant."
"I know, It's ok John. If that happens we will deal with it." She said as she was still slowly sliding her pussy up and down my still mostly hard cock. Our juices were dripping out of her I could feel them dripping down around my shaft as she moved up and down. I leaned forward and rest my head on her back as she moved. My hands slid back up to her perfect firm breasts and I felt how hard her nipples were.
"I don't want to get off" She said as she moved her hands over mine and guided me around her nipples.
"Well we are going to have to clean this up eventually. Mom and dad are going to see the mess and they have to be able to smell us."
"Dad has his window down to stay awake that will help air things out." Emily said as she was still fucking me. I couldn't believe I wasn't getting soft yet. But when you have your cock buried in your sister's pussy and she is riding it you can't help but stay hard until she is done with you.
"I know." She said as she sat down on me and bent over to pick something up off the floor. As she bent over I slid my hands back down over her stomach and hips and lifted up her skirt over her back. Her ass was amazing. Perfectly round and plump. It was a bubble butt of supple flesh. I grabbed both her cheeks with my hands and squeezed her ass shaking her back and forth with made my now fully hard dick strain against the side of her pussy walls.
"mmmmmm" She said looking back at me smiling. She wriggled her ass back and forth for me then leaned back and twisted around so she could kiss me. She reached around her body making her breasts squish together, which made them look even bigger, and ran her hand through my hair as our tongues tangled together.
"You like grabbing your sister's ass?" She said bouncing up and down making my dick bottom out in her.
"I know it's dangerous but I want fill you up with cum every day."
She giggled again smiling at me "Oh I think we can make that happen." She said kissing me again. She slowly started to stand up off me and I noticed she had grabbed her panties from the floor and was using that to catch all the cum that came gushing out when my dick finally popped out of her. She cleaned my dick off as best she could with her panties then tucked her panties under the seat. "I'll get those later."
"Hey Emily, I know you just cleaned up but..." I looked down at my erect penis. "I think I'm ready to go again."