Stacy's Mistake

I first noticed how cute she was when she was turning 18. My step s****r had recently moved in once my mom remarried once again. To be honest I couldn't have cared less I was weeks away from leaving for college and didn't think I could handle another of moms 1 year marriages along with whatever baggage the man brought. Stacy was only about 5'4" with short blonde hair cut into a bob, she couldn't ha e weighed more than 120 with a decent B cup. This is normally not enough for me to take notice in a girl, but there was something alluring about her. It seemed whenever we were alone she tended to wear next to nothing, sometimes it was a bathing suit that barely hid her pussy lips and other times it was see-thru tops. Anyways getting back on track. It happened the weekend that our parents had planned a "lovers getaway". I came home from playing soccer with some guys from school and walked into what I thought was a empty house. I dropped my bag in the front hallway and went to the kitchen for some juice an as I opened the fridge I thought I saw her walking thru the den butt naked! I almost choked in surprise as I started for the den I realized I must be losing it and called for her, but like I thought I was going crazy I was alone. I proceeded upstairs to take a shower and maybe rub one out to help relax a little more. In the middle of my shower I heard the squeaking of the hinges as the door slowly cracked open, I froze once again thinking I was going nuts. I slowly pulled back the curtain almost afraid I would find some kind of apparition there only to be semi relieved and surprised all at once. There was Stacy sitting there on the edge of the sink slowly groping herself thru her shirt! In shock I demanded to know what she thought she was doing, to which she replied huskily "waiting for you Mike, don't think I haven't noticed you drooling whenever i walk past". I was almost a little angry she had noticed I watch her, but even as this thought entered it was quickly pushed away as I felt my cock start to swell and point into the shower curtain making a tent. Stacy noticed as well, then giggling she hopped off the sink an ran from the bathroom. I stood there for few minutes processing everything I had just seen and heard before quickly rinsing off an getting out to track her down for a explanation. I found her in the living room having changed into gym shorts and a sports bra that was entirely to small even for her. As I started asking her about it she fended off the questions pretending that she had no clue what I was talking about. It's only served to anger me, reminding of all the cock teases I had just went thru 4 years of high school with. With this came a profound hatred and strangely enough another hard on. The more she laughed about it and pretending I was crazy the harder and angrier I became. Finally I couldn't take it anymore I reached over the side of the couch and shoved her to the floor, hearing her cry out in pain only served to push me further. No more would this stupid cunt play these games with me, this was her biggest mistake. I hopped over the couch straddling her chest with my cock making a tent over her face thru the towel, she tried shoving me off and screaming in protest. I was enjoying this, I don't even know how or where this feeling was coming from but I loved it. As she opened her mouth to scream I seized the opportunity and shoved my cock in her whore mouth. To my surprise she didn't really protest as much but I guess when you're on your back and a cock is shoved into your mouth there isn't much you can do is there? I continued to rock deeper into her mouth attempting to bury my shaft until my balls would rest on her chin. All I could hear was her trying to breathe around my cock and see the tears start leaking from her eyes. I finally lifted off of her expecting her to scramble away, instead she slowly brought herself to her knees and looked at me defiantly and asked "is that all you've got you pussy?" This sent me over the edge again kicking the towel away I slapped her hard with one hand while the other grabbed the back of her head and pulled her into my cock, I started really face fucking her telling her how much of a slut she was and that I know all about cock teases like her from school. All the while getting a sense that she liked it, while still choking her with my meat I reached down a jerked up her sports bra letting her perky little tits point out in the air, her nipples stood out erect almost asking to be punished. I grabbed 1 nipple and pinched and twisted hard at the same time she cried out in pain around my cock making me want to punish her harder by this time Stacy had become self sufficient on my cock and was forcing herself to go deeper so I was free to grab hold of the other nipple and begin torturing them both at once. After a moment she pulled my cock from her mouth slapping herself with my cock telling me that yes I was right she is a little cock teasing whore and does deserve to be treated like one. Sucking my balls into her mouth tonguing me driving me wild, she would bite and suck on my inner thigh while jacking my cock. Finally I began to get closer and closer to Cummings, once I started to swell I forgot all about her nipples and grabbed her head in a two hand hold and without warning shoved her down on my cock so hard I swear I heard a pop as my cock head settled in her throat, her eyes bulged from her head and she made supreme in audible sounds but all I cared about was dumping my load deep in this sluts mouth. I felt as though I had shot a gallons worth of cum into her, and to her credit not 1 drop came back up as my cock grew soft in her mouth. I felt the vacuum seal from her lips break as I pulled free, she just stared at me like a orphan on the street as I walked away to put some clothes on smiling the whole time knowing I had just owned my step s****r. Also knowing in the back of my mind that this wouldn't be the last time.....