My Girlfriend Cheating Changed Everything

So at the time this story started, my girlfriend and I were not in the best place in our relationship, but not at all in a spot where I think she’d do something like fuck her ex. But, it’s what happened! She sent me a text saying she messed up and that we should take a break, I pressed her for what happened and she admitted to inviting her ex over to talk about what ended their relationship, but things went in a different direction and they had sex. I was furious and asked when, that’s when she said it just happened, I found out he was still there while she was texting me. I was so angry I drove over there, I was going to beat the shit out of this dude for knowingly banging my girlfriend. That’s what I thought, what happened next lead to me unlocking a new main fetish that would completely change the course of my life sexually. So I got to her apartment and stormed in, the dude was basically the same size and build as me so it’s not like I was running at some dude twice my size, but he might as well have been. I got my ass kicked, just straight up threw me around like a ragdoll. I ended up yelling out for my girlfriend to stop him and get him off me. She did tell him to stop and said “I learned my lesson”. He was still naked during this, so when she told him to stop he pinned my shoulders down with his knees and said “nah I don’t think this little bitch has learned his lesson yet”, and proceeded to slap his dick on my face, to which my girlfriend bursted out laughing which was absolutely humiliating, to make it worse his dick was growing as he did it, so his full what had to be thick 8 inch cock was now slapping my lips and I was realizing the my girlfriends ex had a much bigger dick than my 5 inch much skinnier dick. Even in that moment it was running in my head that my girlfriend probably liked that more, I thought it couldn’t get more humiliating. That’s when he said “open up and put this big dick in your mouth and then you can go you little bitch” I heard my girlfriend say “that’s enough baby”. He was pushing it at my lips so I used all my remaining strength to flip around to get away from it, but that made it worse. He grabbed the waistband of my sweatpants and underwear and yanked them down in one motion, and gave me a hard slap on the ass and grabbed the back my hair and pulled it back so I was looking directly at my girlfriend who looked genuinely concerned, he told her to hand him the lube so he could put me in my place. My girlfriend laughed in my face basically and told him no and to let me go. I stumbled out of the apartment, tears in my eyes getting to my car as quick as I could. When I got in my car, I felt like i lost all my dignity, I drove back home and took a longggg shower. I didn’t do anything for days, called in sick to work and just laid around. My girlfriend and her ex got back together, I felt defeated and like I lost my manhood. But during that laying and moping around I started to do something, I started masturbating to what happened. I started imagining him fucking me in that moment and I was cumming harder then I’d ever cum before. I had never even thought of a man sexually before, but it was like something in my brain flipped. I started watching clips of femboys wearing lingerie and getting fucked, but imagining I was the femboy. That night turned me into a bitch, I could not think of dominating or fucking women anymore, I could only think of wearing women’s underwear and being submissive to a cock, I became almost resentful of that night not because of what happened but because he didn’t finish the job. I began living out my fantasies and the sex was amazing, but in the back of my head I knew I wanted his dick to finish the job and completely turn me into his bitch. 2 years had passed since that night, they broke up again after a few months and I had not heard anything from either of them, until one night last month. Not even in our city, I was out of town for work, sitting at a table right near the hotel bar having a drink when I heard “mind if I sit?”, IT WAS HIM. So I was in shock and just said sure. He basically said he just wanted to apologize for that night and said he didn’t know what came over him and that I didn’t deserve it. I was in shock, but I took his apology. We both got some drinks and kept talking, we got drunk and I spilled the beans on my fantasies about that night figuring I had nothing to lose. To my surprise he loved it and said let’s finish the job, and we went up to my room. After 2 years of fantasies it happened, he finished the job. He has a big dick so I wanted to start on top and slide down it at my pace in cowgirl position, so I slid down it and it felt incredible, my dick was leaking a ton of cum. When I finally got him all the way in, he reached around and grabbed my ass and i immediately came. Best sex of my life