Responding to the OP's query.
i feel like i only grasp pieces to the puzzle of why types of humiliation or embarrassment can be so erotically powerful with me? my best experiences are when a Dom sees me and doms me without their being any agreement, He just leads me into the situation and i willingly follow, it's a sort of dance where He leads? (i may have written about this elsewhere, but it was a profound experience for me, so i'll share it here).
A Dom picked me up when i was staying at a gay resort in Palm Springs. There was no discussion about D/s. We met outside in one of the lounge areas. This is a clothing optional, private gay resort, so it's not unusual for sex to happen outside. At some point things got to where He was standing in front of me and i pulled the front of His shorts down so i could suck Him. He gently, but firmly held he back of my head and guided me... but only briefly. He commented that He was not used to having sex in public, so i invited Him back to my room. As we walked there, i casually mentioned that He seemed to have some Dom tendencies, and that was the only time the word was ever spoken between us. He didn't really respond when i said that.
When in my room, He sat up naked against my headboard with His legs spread and asked me to lie between them on my stomach and take His penis in my mouth. It was big and it was thick. i'm not a natural at deep throating and i hate gagging. i'm afraid of vomiting. He once again held the back of my head with His hand, sending a message, but not forcing. But He never stopped talking. His talk was all positive. There wasn't a hint of force or bullying. Instead, He used encouragement and praise. He'd encourage me to take all of Him and say things like" "that's it, that's great, just around the curve." And when i would try and get more of Him, He's literally gush: "Good boy!!! I am so proud of you!" When He'd say that, like He was praising His puppy or a kid, part of me would think: "i'm not a kid." But emotionally, i found myself blushing with pride and redoubling my efforts. As i did, He would increase His praise, always telling me what a "Good boy" i was. It always made me feel embarrassed, but proud and happy at the same time.
He did other things too. He'd ask me to look up at Him and look me in the eye. That was awkward in that position, and the more i gagged, my eyes started to tear and my nose started to run. i must have looked a mess and it made me feel even more like a little kid. i don't have any fantasies about age play, but it seems He managed to regress me to some degree because i was really enjoying HIs obvious pleasure with me and what i was doing. He'd ask me questions when my mouth was full and i obviously couldn't answer, but He'd look at me fully expecting a response, which i could only mumble. Usually it was a question tagged onto His praise, like: "I'm so proud of you, aren't you proud of yourself?" Or "doesn't that feel good?" And even though i was gagging and tearing, i found i was really enjoying myself and honestly answered "uh huh" with a full mouth and runny nose.
After He came and was so obviously happy, my emotional response was one of adoration. And that too embarrassed me. i felt used, and sort of found out too, but i also felt so good and happy with Him that i couldn't help adoring Him, even though it seemed strange to me to feel that way. He forever changed the way i suck a guys cock, even to this day, it sort of triggers something in me.