I didn't realize this was what it was called until I found the tag on Pixiv not all that long ago. But I had been looking for a long time. A... really long time. See, in the first Streets of Rage, there was a whip using dominatrix enemy. I liked her, but the thing that I liked the most was something she did past the 4th stage. Up until then, she'd take hits like every other character. But at that point, she got a trick. Sometimes when she was taking a normal attack, she'd scream and fall to her knees. Now, this was a gameplay element that forced you to change the way you approached the encounter. But oh man, for me, it was the beginning of a lifetime of searching.
I fuckin' loved that idea. It took me so long to find words to describe it, to understand how the power dynamic shown was something I loved, how to contextualize it so I understood I wasn't some horrible monster who just wanted to beat women into submission, how the interplay between danger and vulnerability is what floored me and sent me looking. I'm not trying to be self-pitying here, but when I think about this it's hard to not think of how long I spent genuinely scared of this part of me, when I don't think it's something to be scared of. In fact, these power dynamics interest lots of people. Just look at erotica, people love to explore this sort of thing.
But yeah, it was Streets of fuckin' Rage. Not only that, of course. Diablo 1's succubi died in an overtly sexual way and boy did I like it, although I really disliked that they died. It's why I preferred Golden Axe 2 to 1, because I didn't like cutting up the Zubrokas. I have a distinct memory of the side of a Final Fight machine that had custom art of Poison and I was mesmerized by it. Other things that make me realize I'm old now.
I'm gonna make myself sound even older but anyone finding this fetish now has it super good. The idea of finding weak enemies in particular super sexy wasn't codified in any language other than Japanese until a few years ago. And while you'll hear people talk about how games don't have sexy enemies anymore, they're wrong. There's so many out there because there's so many GAMES out there, and the amount of art aimed at this particular niche has exploded. There has not been a better time to be a zako fan. Enjoy it.