I recently found this sub and after reading some posts, I feel that it’s the perfect place to share my story. I am currently living with my girlfriend of five years, and I am also currently fucking the 19 year old dancer/college student that lives downstairs. Before you go judging me, know this, it was 100% my girlfriend’s idea. Well, maybe I had thought about it as well, but she’s the one who made it happen. I’ll call my girlfriend “Kate”, and up until a few months ago, I had never cheated on Kate. We live together, have a great sex life, and are probably headed towards marriage some day. We’re both in our late 20s, but we live in a city with a lot of college students. “Melissa” moved in downstairs about 6 months ago. I ran into her a few times in the parking lot/laundry room, I introduced myself and couldn’t help but notice that her body looks like it was built for fucking. Perfect legs, a nice curvy ass, and some perky breasts that I later learned were deceptively sizable, too. My GF seemed to notice, as well. She started making comments about how “sexy” Mel was, and asking me what I thought of her. I always got a bit awkward, not knowing how to respond, until one day she flat out asked me if I’ve ever thought about fucking her. Of course it had crossed my mind, but not in a way that I thought it was possible. I should mention that a few months before this, Kate took an interest in asking me about past experiences with girls. She still seemed to get jealous of any emotional connection, but she really liked hearing about sexual experiences. She’d only bring it up when she had been drinking, but any details I told her made her crazy horny and would lead to very passionate sex. One such night, Kate told me that the thought of me with Melissa really turned her on. She said that she thought about Mel and me all the time, she would fantasize about me “plowing Mel”, and asked if “I thought she could handle my cock”. Not only had I never heard her talk about me with another girl in the present, but I had never seen her hornier. She brought up the idea a few times but after a few months she got more serious about trying to set it up. She didn’t want Mel to know about her desire, but she started inviting her over more and more, and the two of them became friendly. I don’t know the full extent of their conversations but she definitely made it clear to Mel that we were not in a conventional relationship. One night, Mel was drinking with us and her leg kept rubbing against mine. It seemed like an accident at first, but then it kept happening. At one point, when Kate was making some drinks in the kitchen, we locked eyes and she bit her lip. I felt movement in my pants, she was definitely sending me signals. I told Kate about this later that night, and it sent her into freak mode. She dropped on her knees right there and went down on me. A few days later, Kate had to leave for a business trip. She told me that if anything were to happen with Mel, I had to tell her immediately and would need all the details. She even asked me to try and take picture or video (we had recently started doing that in our own sessions), but not to tell Mel that she knew. The first morningthat Kate was gone, Mel texted me asking for help moving some furniture. When I went down to help, she answered wearing a sports bra and yoga pants. Her body is just unreal, she definitely caught me staring more than once. I helped her move her new couch (pretty much across the room and then back, haha) and during the process I kept finding myself in very sexual positions with her. At one point, I ended up right behind her and she pushed that perfect ass against my crotch. She let out a little giggle as I’m sure she felt my throbbing cock up against her. After we finished moving everything back to it’s original place, I had to go to work. I gave her a hug and it felt like it lasted forever. We both seemed to be pressing our bodies against one another, especially our hips. When I returned home from work I texted Mel to see what she was up to. She didn’t respond right away so I got in the shower. When I finished up, I put a towel on and could hear knocking at the door. It was Mel, she was wearing a sexy little slip and had a bottle of vodka. It probably made it more charged because I was just wearing a towel at this point, but it felt like we were going to go at it right there in the doorway. Both of our eyes kept darting up and down each other’s bodies. I let her in, put some clothes on, and she made us some drinks. She came and joined me on the couch, we clinked glasses and took a sip, then had a long pause of eye contact. I was trying not to stare at her thighs, but it was impossible. This time, it was just the two of us, and I moved in. We started making out and I immediately slid my hand in-between her thighs and started fingering her. Her pussy was already wet but insanely tight, I could only fit one finger at first, and the little noises she made were heavenly. She stood up and let the slip fall on the floor, her body was even better than I imagined. I recorded a later session so here’s a screen shot of what I’m talking about. https://i.imgur.com/zPFyh4x.png (I won’t be posting the video to protect her identity) She stood in front of my like this and went down on me. It was amazing. Then, I pulled her on the couch and we 69’d until I could feel her thighs trembling from an orgasm. She slid all the way up and sat on my cock. It felt like it took her a full minute to slide it all the way in, she was so fucking tight. Then, she took control and bounced her perfect ass up and down, bending forward with her hands on the ground in front of us. I was in heaven. I asked her to turn around, and she rode cowgirl for a while.https://i.imgur.com/jz7a7Fo.png Her movement was unreal, I could have busted in a minute. Her hips, combined with the little noises she made got me so horny that I sort of lost control and we were both just going wild on one another. I knew I couldn’t hold it much longer, so I lifted her up and made sure to fuck her as hard as possible standing up (for Kate haha). It was incredible, she was screaming and scratching my back as I bounced her up and down on my cock. She felt light as a feather and I could feel her tense up and get an orgasm just as I exploded inside her. We fucked two more times that night, and countless times since. She still isn’t aware that Kate knows, but Kate is warming up to the idea of telling her. I kind of like the sneaking around aspect though, it’s fun. I usually “sneak” down to her place, but we even got a hotel room once for an afternoon quickie near my work. Kate and I are probably having more sex than ever. She absolutely loves the videos, and she insists on fucking me the moment I walk in the door after I’ve been with Mel. It’s exhausting, but in the best way possible. There’s a lot more to tell, but that’s all for now. Sorry for any typos, didn’t get a chance to proof read.