To preface, I'm no slouch. I'm above average or at least average in many respects. I'm 6 inches and pretty girth. Above average height, and probably average looks. I'm lean and tone, but not muscular as I only casually work out. Before this event I'm about to elaborate on, my fiance found me very sexy and viewed me as a catch. She also said I was the best she ever had in bed. Unfortunately, I'm really into cuckolding, so while that did a lot to help my confidence, it made it very hard to find a good or comparative bull up to this point. Every one had either been too small, no stamina, or just not that attractive to her. This was until 'he' came into the picture, who I'll simply refer to as her bull. 
 She had been planning a visit to New York before we began dating, and the time had finally come. To spice things up I gave her an open hall pass, so to speak, to fuck whoever she wanted so long as she followed a few ground rules: they must use a condom; he must pull out; and only one night per person to avoid the obvious risk of impregnation and attachment. It's also worth noting that this was all before she was on birth control.
 The first day of her trip was uneventful and we simply said goodnight over the phone and that was that. The next morning however, I woke up to a video that shocked me. She was sucking a guy who was clearly 7 inches or more, tone and carved abs, and tall. This guy was simply put, hot. I immediately got hard and my mind raced full of questions. 
 Typically when she'd be with a bull she'd have to essentially role play them being good or better than me to go along with the kink, only admit later than none of it was true. This time, however, she'd clearly meant every word. Nothing was embellished and her voice was oozing with desire whenever she spoke of him. She told me after we said goodnight that she couldn't sleep. So she went downstairs to her hotel bar to get a few drinks. While there, she was approached by this guy and she more or less melted to him immediately. They quickly went up stairs and they fucked the entire night. She'd actually not even slept yet as he'd only just left when she texted me.
 Not only had she never been so horny to fuck all night with me, but she'd never sounded so enthusiastic to recall it. He was clearly better than me. She said he was massive compared to me, and while it hurt at first going in, she came extremely quickly on his cock. In fact, she admitted she'd cum multiple times on his cock before he'd even cum once, and they fucked multiple times throughout the night. She said he just hit the spot the way I just didn't. She even begged me to let her see him again tonight. I was hesitant at first, but admittedly I was extremely turned on and thinking with my bones so I allowed it.
 We'd agreed to him leaving at 11pm and after. 11 came and went. 12 o clock and still nothing. I called and no answer. Eventually I went to sleep, worried. I woke up to a string of texts apologizing but also followed up by another video. This one shocked me, but turned me on so much that I almost came without even touching myself. He was fucking her bareback, already a broken rule, but then she turned around and begged him to cum inside her. It was clear in the video she was completely consumed by the passion and the feeling and lost all logic. He was just too good. I watch as he started grunting, grabbed her hips and I was staring at the moment he filled my fertile fiancé with his seed. My heart raced. I was furious but couldn't help but jack off. Only a couple strokes and I came all over my chest. I jacked off over and over because of how hot it all was. 
 It wasn't until later that o followed up with her. She admitted that she was wrapped up in the moment and he felt too good. She even admitted that it wasn't just the once. He'd came inside her multiple times that night and even the night before. He had the decency to buy her plan B at least but the fact she so quickly caved to him was so worrying, but so hot. 
 When she came home, my position as a cuck was cemented when I tried the same position I saw him doing in the video and she was not at all reacting the same way. It was clear to me that I simply couldn't compare to him. My confidence was crushed, but my kink was so satisfactorily fulfilled. We've since not done anything like that and she's even back to borderline worshiping my cock because she's a very submissive type in bed, but I'll always remember.