I could tell that whomever had set this up had also payed for the whole floor to be clear as the only guests that seemed to have a room on it, were pa...ty-goers. At first glance it was a regular kind of party. Hot guys, sexy girls who wore slutty dresses like mine. but as soon as we all entered the room we noticed just how wrong we were.... There were people on the dancefloor, dancing and drinking but also, there was people in the kitchen having sex on countertops, an orgy in the bedroom, people. I didn’t have exciting plans for the weekend ahead, but at least I’d be at home with Adam, my boyfriend of two years.I clicked through my personal mailbox as I ate my lunch, discarding the reams of January sale offers. I was about to delete the next message on the list, when the title caught my eye: ‘Valentine’s Fling, by invitation only’. The name in the sender line was simply ‘K’. I'm apathetic about Valentine’s Day, but I wondered if the ‘K’ in question was my friend Kate, and she was. I started watching her through my bedroom window and wanking off over her. I loved seeing her in her work clothes. Very tight black trousers caressing her round shapely but full arse. Usually with Tights or stockings and black high heel shoes. For some reason I wanted her to see me naked. My cock was becoming quite a nice size by now. I started off standing on my bed in the window towling myself down, pretending I'd had a bath and I was unaware of her but making sure she saw me naked. Not to. She works magic as she sucks, but I'm eager for sex. She must feel the same way, because she stands up and leads me to the couch. “I'm on top,” she tells me knocking me onto my back. I do as she says stretching my hands behind my head. She gets in a reverse cowgirl position and starts to move up and down. I follow her rhythm and after a while we flip over and I get on top. I love playing with her boobs while we fuck. I lean down and bite one. She moans and I move to the other nipple. We.