i'm not even that horny for superheroes but secret identity shit is great and so is public sex and superheroes were made for banging on rooftops
i don't have names for these two but the idea is she's a business exec, and he's her assistant. they have an entirely platonic dom/sub relationship outside of work and it's Fine.
but they are also a supervillain and a superhero, with a very passionate sub/dom relationship and no idea who the other is. it's perhaps less fine.