I hope it's okay for me to do this, but I posted this before when I was super tired and didn't give any details and now I wanna do this prompt proper so -

Foggy coming out to Matt as trans while they're undergrads. Foggy teaching herself how to braid her hair with Matt helping. Matt and foggy painting each other's nails because Matt can't see how it looks anyway and he doesn't want foggy to be singled out when they go to parties with ppl foggy isn't out to (which is like everyone but Matt). Matt buying foggy hair bands and cute shit like that that foggy can wear without it being obvious she's trans. Matt coming back to their room with a massive pack of razors because he knows foggy hates her stubble and her chest hair.

Basically Matt being amazing and supportive of foggy, to the point where she eventually feels safe enough to come out to more people than just her roommate/bff (who she only initially came out to because it would be really hard to keep it a secret from).

I think I'd prefer gen for this one but its up to you