. That's fine with me..." Mike replied.Andy and I stood up and all three of us pulled our boxers down.All of us were having boners at that time.Mike p...t a little bit of vaseline on his dick and Andy put some on his butt.They positioned for missionary and Mike slowly slid his dick in Andy's ass.I was sitting next to them stroking my dick and watching them fuck. I think just the sounds of their fucking made my dick even harder.Mike was trying not to moan loudly but he couldn't help it. Andy was. I stood slightly and hung my breasts over the seat next to him. He instantly looked over at me. “Do you want to sit back here?” I asked him fearing someone else would try to sit next to me. There were still people getting onto the bus and this huge woman appeared at the front. I could see her eyeballing the back, too. I looked at him in a panic. “I like to take window.” He said smiling back at me and then turning to peer out into the depot. I looked at my seat next to the window and pointed to. .. hot in here Tim, clothes may come off, just forewarning you," Emily said."I'm forewarned," I replied.From the chair, I had a perfect view of them, that was about five feet away and it was a sight to see. I had seen my sister in her bra and underwear before, but never naked, so I was in for an experience that really just fell into my lap, not literally though. I knew it was really weird to get a hard on watching my sister make out with my girlfriend, but it happened for reasons I don't think. 'No, my dear, on the contrary you'll enjoy yourself, ' I said.'No, I don't believe you, ' Nagma said.'Ruby, are you willing to try?' I asked.'Will it do any permanent damage?' Ruby asked cautiously.'Of course not, otherwise I wouldn't have suggested it, ' I replied.'Nagma, get off him and let me try it, ' Ruby said.'Y... you are willing to do it, ' Nagma asked surprised.'Yes get off, ' Ruby said again.'Wait a minute. I've changed my mind. I'm willing to try, ' Nagma said.'Okay, Ruby you lie.