Oooh, I know this one! For me it's fic where a character has some aspect of themselves (sexuality, kinks, wings - it covers a broad range!) that they're ashamed of, finally reveal to someone else, and are affirmed in. I probably see it most often in kinkfic, where someone's ashamed of their kink for watersports or whatever, and their partner helps them embrace it, but I'm also super into it in non-kinky and non-sexual contexts.

It even has a name! stultiloquentia coined the term "shame/comfort" a few years ago, and I've tagged a few fics with it on AO3, but unfortunately it's never really caught on with fandom at large.

Here's a couple of fics of this type that came to mind:
untitled - Hockey fic where a pregnant guy is embarrassed about his loss of bladder control
I wanna fit inside you - Hockey fic where guy has an oviposition kink (and is also into his sister)