My step sister Lilly was getting dressed for the school party she had an invite for. I notice she put on her push up bra even thought she is only a B cup, It did make them look bigger. Next were her crotchless panties she was ready for action, then her pink slinky dress which when pulled down comes to her knees. However when pulled up and arms taken out it becomes very small around the waist. She did test it three times. With her figure of 22, 12, 19 she looked as sexy as hell. I moved from my peeking spot and dressed in my room.

“Tom” Lilly yells out, “Tell mum and step dad I’ll be home after midnight. Bye” and off she went to the party six houses up the street. What my 18 year old sister did not know was I got an invite as well. I changed my jeans into a very loose football shorts, ones that allow me to pull my cock out very quickly. I am eleven inches long and do keep my girls happy.

Thirty minutes later Dad messaged ‘had drinks will be home mid morning’. I replied ‘OK dad have fun’ That was it, I knew I could go to the party with no problems. Locking up the house I walked down the street to the party house. It was on, drinking, drugs, sex and rock and roll music very loud. Just what a randy boy needed.

On the lounge was Kate getting fucked by three guys, which is normal for her. Every party she tries to fuck every male and get females to eat her cream pies. She was the school slut and proud of it. The only person she had never got was me, I just clashed with her. I walked around with a beer in hand to see the other scenery. In the back yard were three couples banging away with their partners. Back inside and upstairs I saw my step sister dress pulled up and masturbating herself holding onto the door frame. This was my chance to teach her.

I walked until I was behind her and pulled out my semi hard cock, I wanked myself getting it hard watching Lilly watching the couple on the bed. I slipped my cock between her legs and pushed her fingers out of the way. Not looking around she held my cock and presented it to her pussy. I knew she was not a virgin so I rammed my cock deep inside her. I hit her womb and she had an orgasm, holding the door frame to keep herself steady. I was not fully inside her, my cock did not fit her cunt. I pulled out and rammed my wet spunky cock into her arsehole. She moaned loudly as I entered in pleasure. Now we were being watched by five other people. One grabbed her head and pushed his five inch hard cock into her mouth. She gobbled his cock in pleasure. He soon shot his load. I came out of her arse and moved to her mouth, she tried so hard to fit me in, at least she cleaned my cock. Another boy fucked her pussy as I shot another load into her mouth. She gagged on my cum spilling half of it on the floor. I moved away and another male pushed his cock into her mouth.