I'm your girlfriend's sister. I walk by your apartment and you ask if my sister is home. You tell me that she doesn't and that she's out running errands. You invite me to come in and hang out while she comes back, I agree. Today I have my hair down and I'm wearing a very active outfit. lightweight sports jacket with a tank top underneath. some cute leggings, those that make my butt stand out. I walk in and take a seat on the couch. I take off your jacket and put it aside. We talked for a bit and finally got to the subject of my love life. I haven't had the best luck with guys. I've been on a lot of dates and I've had very short-term relationships. I tell you about my most recent date. it was horrible! the guy was not very gentlemanly and he was very full of himself. I say how lucky my sister is to have found such a great guy like you. I keep talking about how I wish I could find someone as genuine, kind and handsome as you. I joke that I wish I was dating you instead of my sister dating you. We both smiled and let out a small laugh. I ask you to come closer to me. You ask me why and I tell you to trust me. You have doubts, but you agree anyway. you walk up to me on the couch and start rubbing the inside of my leg. You are a little taken aback, but you remain still. I say how I've always noticed that you look at me and my cute butt every time I walk by. how I always catch you looking at me every time I go to your house. I admit I always think about fucking you. You admit that you also thought about that scenario and how you always wondered how I look under those clothes. I pull down your pants and start to suck you. then I take off my tank top and sports bra. I play with mid breasts for a while and slam your cock on them. then i take off my leggings and turn around and start twerking, show my big butt. Then I take off my underwear and you bend me over the couch and start fucking me doggy style. i moan and scream your name…you fuck me in that position for a while then we move on to missonary. I moan and scream your name some more. Then I suck your cock all the way and you end up all over my face. We both laugh and promise not to tell anyone. I freshen up and leave your apartment. I tell you I'll come back a little later when my sister comes back.