Author's note: Hey everyone! So, this is my first fanfic ever and I hope you like it. There will be more chapters published if anyone seems to be interested in this story. As the title might suggest :P, it is kind of inspired by Katy Perry's song "Last Friday Night". English is not my first language and I don't have a beta, so please excuse my mistakes. I would love to hear what you think, please review! 3 (Disclaimer: I do not own HP in any way)

Nothing is nicer than waking up because of some annoying people knocking on your door. Knock knock. My head was pounding and I didn't even consider getting up. Knock knock. "Go away." I mumbled into the pillow, but the knocking didn't stop. "GO AWAY!" this time I screamed. The person behind the door laughed for a moment and then said "Player!" and left. Player? What was that supposed to mean in this context? I sat up in confusion. Suddenly I noticed that something was wrong. This was not my bed I was lying in, neither was this my room. I looked around. The room, which was for some strange reason showered with glitter, was quite big for a Hogwarts dorm, and the bed I was in seemed to be the only one in it. Though I wasn't the only one in the bed, I realized all of a sudden, when a definitly male arm reached out from under the black silk blanket next to me, embracing my waist, which was, as a matter of fact, naked. Actually, almost every part of my body was in this condition, all I was wearing was my underwear. What had happend last night? I couldn't remember at all, and it was unpleasant to try because of the incessantly pounding in my head. The hand on my waist lazily started to draw imaginary circles with its fingers, causing me to shiver. I wanted to know so badly who this boy was, but I was way too scared to risk a look. Watching the fingers comforting my skin, I slowly began to realize the situation. I, Katie Bell, just woke up in a strange bed, next to a yet unrevealed person, hungover, naked... the conclusion kicked in my still not really properly working brain and I abruptly jumped out of the bed. I had sex with this guy! Not that I was a virgin before, god no, but I had never been a one-night-stand, casual sex type of person.

I started scanning the room for my cloths to escape as fast as I could, but couldn't find them anywhere. Recapulating what I was searching for, I remembered that yesterday was the day of the winter ball. After the official dance at the Great Hall, Angelina, Alicia and I went to the party Fred and George were hosting. So, I was probably bored watching Alicia and Angie flirting with their boyfriends and got drunk (I still smelled like an entire mini bar) and decided to make a move on another Gryffindor. This is how it must have happend, although the room didn't look at all like I imagined the Gryffindor boys' dorms to be like. I finally spotted my dress underneath a little coffee table, but grabbing it, I had to notice that it was completly ruined. Not only was my favourite dress, strapless and with black lace, covered with several smelly alcoholics and chocolate, but also was it totally ripped. "Shit", blurted it out of me. What was I supposed to do now? "Where are you going, Kats?" asked the boy, of whom I still couldn't see anything but the back. "Ehm..." I panicked. Why did he know my name while I didn't recognize him, not his well formed back, not his actually quite sexy voice? "Just to the bathroom." I turned around and faced two doors. After quickly steping through the left one, I found myself not in a bathroom, but in a huge closet, filled with expensive and exclusive looking cloths. I grabbed hastily a random shirt and entered the other room, which was thankfully the one I was searching for. The wall-filling mirror exposed unmercifully my hungover look. My dark brown hair was a mess, the attempts to rearrange it were pointless, left-overs of make-up were smeared all over my face. I let the water flow over my face and arms for a few moments, before putting on the shirt. It was big enough to hide almost half of my thighs. Checking that in the giant mirror, I suddenly noticed the emblem on the shirt and froze. No, that was just not possible. Probably my head was still confused thanks to the amount of last night's alcohol. For a second, I closed my eyes, took a deep breath. I must have been mistaking. But when I risked a second look, it was still there. The snake on the green background. The emblem of Slytherin.

I had to sit down on the floor. So, I slept with a Slytherin. A Slytherin. Knowing that fact, I suddenly knew who it was. Tall, black, handsome, and extremely arrogant... Blaise Zabini. No, no, no. That was bad news. I actually did it with Hogwart's biggest womanizer. How did I loose all my self-respect? Yeah, right, alcohol is the answer.