I figured things would change some in my life when my mom remarried. I just didn't think my life would take a total 360. The things I would experience thanks to my new step-sister Katie still shock me some to this day. But I will start from the beginning. When I was 18 my mom got married again to a rich businessman this time. He was a nice guy and could provide us with things we needed so I didn't mind my mom marrying him. The best part to me though was my new step-sister Katie. We had gone to school together for years but we didn't really run in the same circles. She was one of the most beautiful girls in school and was very popular, but I was average in about every way possible. Katie and I got to know each a little while our parents were dating but not much. They got married a few days after we had graduated high school and I moved in to her father's large home right before they left for their honeymoon. Katie was gone the entire day I was moving in, probably out partying or getting fucked.
She had a reputation as being a party girl who didn't mind putting out. I had heard some stories about her ranging from her being bisexual to her being involved in gangbangs. Not that I was against getting screwed up and going to parties and getting laid, but I wasn't very popular with the ladies I guess, in fact I was a virgin when I moved in with her. I heard Katie arrive home around 4AM that first night I stayed there and stumble into bed. I woke up the next morning and explored all the new things I could do in my new home. I started off by taking a swim in the huge pool they had in their backyard. The cabana out back had a bunch of Katie's string bikinis spread out across the floor. I had imagined what her smoking hot body looked like in the bikinis and without anything on at all. My biggest hope moving in was that she walked around in little clothing all the time and that I might get to catch her naked a few times. After taking a swim I dried off and went inside to watch some TV in their living room, which was more like a movie theater than a living room with all the gadgets and other things they had.
Around noon Katie finally woke up and strolled past the living room. I guess she didn't even remember I was moving in as she walked by in just a tight white tank top and a pink thong showing off her amazing heart shaped ass. I was instantly hard as my cock sprang up in my gym shorts. She walked into the kitchen and grabbed a bottle of water. As she passed by the living room again she gasped and almost spit out the water she was drinking as she was shocked by my presence.
"Oh god you scared the shit out of me, I forgot I had roommates now." She said while looking me over.
My eyes locked on her amazing body as I tried to focus and respond "Yea umm sorry, I moved in yesterday while you were out."
Katie smiled and said it was fine as she strolled over to the couch and sat next to me. She stretched out and gave me a nice view of her curves before plopping on the couch. Her head turned down to see the erection in my pants and she smiled.
"I hope you don't mind my attire, I tend to walk around in my panties and bikinis and sometimes naked even cause I'm usually home alone." She said with a devilish grin on her face knowing the effect she had over me.
"Oh no its fine I don't mind at all, you don't have to change your ways for me." I responded sounding like an idiot to her probably, but I tried to change the subject quickly. "So do anything fun last night?"
"Went to a party with a bunch of people from school, got wasted, and umm...you know got a little naughty." She said while laughing and patting her thong covered crotch a couple of time.
"Oh right on, sounds like a blast." I said in jealousy, wishing I could get a taste of her.
"Why don't I ever see you out at any parties Gary?" Katie says while turning towards me as her bare legs begin to rub against mine.
"Well you know I guess I'm really not part of that crowd, my friends tend to lay low, not exactly part of the cool crowd like you." I faked a laugh as I answered, knowing I sounded stupid.
"Well how about I start bringing you out with me, I'm sure you'll fit in well, plus you're my step brother now so everyone will like you." She said with a big smile as she placed her hand on my thigh. I was still horny as hell and she could tell as she kept looking down at my crotch.
"Yea that sounds great, I'd love to sometime." I said while my cock ached for release. I wanted to run off to the bathroom to masturbate, but I didn't want to make it obvious so I stayed seated next to her.