That was one of the best sensation I had had until then. She gasped,”Ahhh” with pleasure as I entered. The feel of her pussy on my bare cock was a...mazing. I grunted, “uhhhh”. Slowly I started pumping that wet pussy increasing my pace. I grabbed her nice juicy boobs with one hand and hair on the other for grip and started pounding her pussy. Intermittently, she turned her head around and would smooch me. The air around was filled with animalistic grunts of “Ah ah ah ah ah ah” & muffled “fuck fuck. I shrug and keep walking, as i open the bathroom door i hear my sister-in-law say 'sorry about the mess' i say its ok thinking what does she mean? THATS WHEN I SEE IT. The treasure all men hope to find, there on the bathroom floor is my sister-in-laws worn knickers and leggings. I drop my trousers and my cock is standing straight up and already leaking precum, i pick up the knickers and leggings, the knickers are lacy and silky, by the looks of it they have been wedged up her fat arse all day.. As we gathered around a fire, and drank and talked, I found myself watching everyone and trying to figure out it thier bladders were also full. I was also watching to see people sneeking off to relieve themselves. After a while, I got lucky, I saw one of my guy friends kinda wiggling, and looking around for a place to go. I walked over to him, and started to talk. Just small talk, enough to keep him from going. I talked for about ten minutes or so, and finally he said, I gotta pee, I will be. Senior stepped towards the door, but stopped dead at Big’s, “Leave it-I think we got the only b*tch we need right here; and she won’t charge us by the hour!” Oh my, what HAD I gotten myself into? I thought in the most delicious anticipation. In the stall caused by the knock, I had gotten out of my pants, and was now only in my white shirt and loosened black tie. My legs were long and slim and I was feeling like quite the Black Cock slut, I can tell you!Big pushed me back on the edge of the bed.