My two best friends were fucking each other and I was stuck masturbating.Eventually Sarah asked me to drive her home. She had a ride from another frie...d that night, one that left earlier. Rachel gave me a weird, concerned look, but then we left. It wasn't a long drive to her apartment. She was quiet the whole drive. When we got there we stayed in my car and she finally said something."I'm sorry about having sex with him at the part. I'm sure it was kind of embarrassing," she said."Yeah, now. Raghav, pack your clothes, you’ll still be able to catch the train if you leave within the next half hour. You guys enjoy yourself, and I’ll be back by Thursday.”That is how I found myself, sharing an AC berth with mom at 10:30 on a Friday night.We would reach our destination mid-morning the next day. “You’re ok going on a holiday with your boring old mother?” Mom asked me, once we got settled in the train. “Sure mom. I needed to get away from the studies for a while” I said and smiled at her. My cock was already pretty hard at this point but with Bec kissing my neck and rubbing her hands down my chest, my bulging dick felt like it was going to break through my underpants. Her hand reached my pants and gripped my shaft, sending tingles right down to my balls. I ground my throbbing cock into her palm as she lightly bit my lip, I thrust up a second time but she moved her hand to stop me. I moaned in protest but instead she straddled me reverse-cowgirl and began to grind her wet panties. It was then I noticed the twins Kate and Stacey, Bridget's younger sisters, walking with two other girls a chubby red head girl and a thin young Asian girl, they were all in tiny little bikinis and were to busy chatting to notice me.Thinking I could maybe get out and not be noticed I carefully swam towards the edge and as I was about to step out of the water Stacey suddenly saw me."Hey it's peter" she said pointing at me.Then Stacey and Kate came running over towards me."Hey peter what you.