Almost cucked by gf in club [cuckold] [F22]

It was one year ago, when my girlfriend (F22, petite fit blonde with a round ass, 5’2”), and I (M23, 6’), dating for 2 years, were on vacation in London. She knows I have a cuckold fantasy, but she’s really not into it. Earlier that day, she got upset with me because I was checking out a girl in a miniskirt. She complained, saying she thinks she’s not my type, that I prefer slutty girls who could cuck their boyfriends and dress provocatively, but she’s not like that at all, she’s in love with me and vanilla. That night, we were both drunk at a dance bar. She was wearing a tight black dress that made her ass look huge. A lot of guys were checking her out. As a joke, I pointed to a drunk older woman and said, “I’m gonna kiss her.” A few minutes later, I tried to kiss my gf, but she pulled back and said, “You’ll ruin my plan,” nodding toward a very tall, muscular guy (6’6”, I think) way taller than me. My stomach flipped. I’d always fantasized about this, but I wasn’t sure I could handle it in real life. She started making eye contact with him without asking me, smiling at me the whole time. She backed up slowly until she was right next to him, making sure he noticed her. Now there were 5–6 meters between us, and I was watching from the bar. She began talking to him, I couldn’t hear anything over the music. She touched his huge arms, and when she leaned in to whisper in his ear, her hand brushed his neck. Every now and then, she’d glance back at me and smile. My heart was pounding through my whole body. Then came the point of no return: I saw them kiss, then French kiss, while I stood alone at the bar. His hands were on her ass. One of her hands was on his chest, the other trying to feel his dick through his pants. The guy was trying to rub her pussy through her dress and I could see her squirming, making it clear he was hitting a sensitive spot. I’m not sure if I liked it or not, but my dick felt like it was going to explode just watching her small, innocent hand trying to wrap around a massive cock. They danced for 3–4 songs, her ass grinding against his cock. Finally, she said goodbye to him. I saw her grab his dick one last time to tease him, then she came back to me. She was really drunk and said, “My plan worked perfectly.” I asked her what she thought about it all. She said she loved that I was close by, that it made her really horny, and that she was soaking wet. This was the biggest dick she’d ever touched, despite having only seen four real ones in her life, and that’s why she almost dragged him to the bathroom to blow or fuck him. On the moment she was super happy to have touch an other dick than mine. She likes to act slutty in front of me. When we left she tease me a last time « Fuck, it was so much longer and thicker than anything I’ve felt. I kept thinking about sneaking him away to let him stretch me out right there » Maybe I’ll tell the rest of the evening in a second part.