Getting Pegged May Have Changed Everything

My girlfriend and I have a great sex life, we love to try everything and my wife has always been obsessed with my ass, so naturally she has been asking to peg me for sometime. I go to the gym consistently, and I’m very aware my ass has a great bubble shape especially for a man, I take pride in it! It’s also important to know that my girlfriend is 100% the dominant one in the bedroom, I’ve never been with another women like this, she has completely flipped the script and is the one who does the talking, calling me a whore and her little bitch. She chokes ME while she rides ME, and has me where her sexy things. It still confuses me at times but it’s genuinely the best sex of my life. Now, she had been talking about pegging me for awhile and with the dynamic of our relationship, we both wanted to make it official that I was the bitch in the bedroom by bottoming for her, it had to happen. I had been playing with dildos for a few months on my own knowing this night was coming and wanting to be prepared, so she strapped on her 6 inch dildo and walked up to the bed, I was getting into doggy when she grabbed my hair and spun be around to face her strap, she forced it into my mouth and made me suck on it. THIS is what actually triggered a memory for me from earlier that day at the gym and where this story gets weird. I have an expensive nice car that I’m proud of, but that means i don’t get all sweaty at the gym and just sit in my nice car. So I am one of those dudes who actually shower at the gym, the showers at my gym of side stall walls but there’s no door, so everyone walking or looking between the showers can see into yours. I’m not a shy person so it never bothered me, I often got the one closest to the door so I could see all the “straight” men do a double take when they walked by my shower stall and saw my ass. Obviously in order to catch people doing that I have to look back and catch them, but today when I looked back my gaze went past the guy walking past me, I noticed the guy in the stall across from me that I could completely see was actually facing my while in the shower. He wasn’t looking or being weird, he was just facing my direction which no one did because obviously now any one walking by can see your dick and balls clear as day. My eyes of course went down to check out what he was working with down there and I was in awe, he had to be 5-6 inches soft, it was basically my size when I was hard and and had a good thickness but also not too much where you’d think it would hurt a women. I had never looked at a man or a penis this way before, but I was REALLY enjoying what I was looking at. My cock had sprung to life, and I was in a trance starring at this soapy big dick. That when I got caught, the soap cleared from the guys face and we made eye contact, I got terrified for a moment that I was caught, but the guy actually glanced down at his cock and then looked at my hard cock sticking out in front of me and just smirked then nodded. I was so embarrassed, all I could think to to was smile back and give a head nod, I was caught already so I did clearly look back at his cock again before turning back around. When I was going through the rest of my shower staring straight at the wall until I knew that guy had left, all I could think about was sucking his dick, I had never thought like this or at least felt this serious where I really badly wanted to suck a dick. I got dried up and left shortly after, I had a busy day and got that beautiful cock out of my head, but the moment my girlfriend put put her strap-on into my mouth and asked if her little bitch liked that, my mind immediately went back to my gym encounter. I closed my eyes and imagined it was him, my cock again sprang to life and and I up’d my pace on the dildo. After a few minutes my girlfriend was calling me a good boy, completely unaware what I was imagining or who I was imagining saying that to me. My girlfriend spun me around herself and smacked my ass hard, I was so ready, I buried my face into my pillow and was fully imagining it was the guy at the gym. My girlfriend clearly has done this before because she genuinely fucked me silly. I was obviously imagining the guy from the gym, but she was hitting all the right spots and had a perfect pace. I came in 2 minutes without touching my dick, she fucked me for 20 minutes and I came a total of 3 times, all without touching my dick. I was loud and begging for more, thank god I don’t know the guys name or I would have definitely said it just out of instinct. Since that night I have become obsessed with bottoming for the gym guy, I see him at the gym a few times a week and and he always smirks at me just knowing he caught me worshiping his cock with my eyes. I masturbate to the idea constantly and whenever my girlfriend pegs me. I kinda feel like I may have to act on it at this point, maybe a 3 way with my girlfriend? I’ll update if it happens.