This happened about two weeks after I taught Patti how to masturbate.
I've submitted two stories here before. One was about me and my brother Mike and the other was about me and my sister Patti. What I'm getting ready to share happened right at two weeks after I taught Patti to masturbate. It was at the beginning of Christmas vacation when I taught her. Our best friend Corey lives next door to us. His family went out of state for Christmas and didn't get back until the day before school started up again after New Years.
After school Corey always comes over to our house so we can do homework and study together. On the day we went back to school there wasn't much homework. We were in our bedroom with Corey finishing up our homework and talking about vacation.
As soon as we were done Patti looked at Corey and asked 'Do you ever masturbate?' He told her that he does it everyday at least once. Patti asked Corey how he did it and he told her he'd show us but he'd need to look at something to get an erection. Without even thinking about it Patti took her shirt and bra off. I went ahead and took mine off too. Corey took off his pants and underwear and sat on the bed. Patti and I sat on the floor in front of him.
After he got hard Corey started jerking his five inch long cock. A minute or two went by and I started getting very horny. I put my hand down my thong and fingered myself. When Corey was getting ready to cum he started grunting. Mom must have heard it because a few seconds later she opened the door and saw us. She said 'Sorry. Go ahead and finish. I'll come back in about five minutes.' That caused Corey to cum and he shot his load onto our shoulders. I had an amazing orgasm.
Mom came in a few minutes later along with Dad and Corey's mom. They explained that it was ok for us to masturbate together as long as we don't let Corey's cum get near Patti's pussy or my pussy.
After that, every day Corey would come over so we could masturbate together. It started off us doing it on our own but after a few weeks Patti and I would take turns jerking him and Corey would finger us.
This went on until I left for college. Patti and Corey continued to masturbate together. They ended up getting married.