.Occasionally I was asked to work extra hours on a Sunday or on a Friday night after school.On one such Friday night I had gone straight to the shop a...ter school and was working in the back pricing up some new stock etc.There was only me, 16 at the time, and the elder brother (Mr R) present at the time.After a while I was asked to stock up some shelves at the front of the store and did as asked. It was during this time that I sensed myself being watched. I was pricing up some tins and stuff,. She could sleep at one of her friends' during the weekdays, but the friend didn't want her there when the boyfriend was visiting over the weekend. So she had started trading her body for a place to sleep and some money. Before last night, she had had between ten and twenty clients, who had mostly been jerks. The guy I had seen last night had been one of them, and he had wanted to see her again. He just had forgotten to tell her that he planned on gangbanging her, with some of his friends.She. All the while increased the speed she was yanking my cock.After a while of doing all this I began to experience this weird sensation in my groin, like nothing I had ever experienced before, then with out warning I seized up and my cock began to spasm shooting this strange white fluid, spurt after spurt, covering all of my body."Wow, so that is what cum looks like" my sister said as she removed her finger from my bum hole."What's cum?" I asked."Well I'm not entirely sure, but I was talking to. I went and got in the lift and pressed the button for the top floor like he said, I still had a hood over my head because I didn't want him to see me without my clothes. I walked out, left all the way to the bottom and as there was only one door. I knocked, pretty quietly but I was extremely nervous, a loud voice comes from the other side "Lucy?" i didn't really want him hearing my voice either, so I just simply knocked again. The door opened, the lights were off in the main room and seb.