"Oh, Chris. Fuck me big bro. Fuck your little sister."
Since the entire family had turned 18, it quickly became commonplace to have incredibly erotic things happening all around you, even when you are just doing something normal, like I was that afternoon. I was just sitting on the couch with Sara snuggled up against me, watching football.
Across the room, though, was my twin sister getting slowly fucked by our big brother.
Sara was in my arms, having started out beside me, but soon finding her way onto my lap. Her ass was grinding on to my cock, and it didn't help hearing our siblings cumming from across the room. Soon I was hard against Sara's ass. If I hadn't been distracted by the game, I would have fucked her right there.
When the game ended Chris and Lynn had long since left. Sara got up, gave me a kiss, and walked slowly into the kitchen. She always walked slowly now, swaying her ass, knowing that her brothers and dad were drooling over it.
So I was left there watching uninteresting post-game, with a rock hard cock. Before I decided what to do with it, I heard my mom come into the living room to check on me. She glanced over to see my cock at attention.
"What has you so horny, son?" She asked.
"Sara," I told her as she gave a mischievous smile, "She was sitting on my lap during the game. Her ass drives me crazy."
"Really?" mom asked coming over to sit next to me. "Can I tell you something?" she said moving in to whisper in my ear. "I love your sister's ass, too."
My cock jumped as she breathed into my ear like that. "Oh, do you like that?" She asked. "Do you like that your mom thinks your sister is hot? That she loves eating her daughter's pussy?" She kissed me a bit, and then said, "Look another game is about to start. Why don't we make sure you really enjoy it?"
She moved to her knees in front of the couch and took my cock in her mouth. She took her time so that I could sit back and enjoy it while I watched the game, but by half way through the first quarter, I couldn't take anymore and shot my cum into my mom's mouth.