Look at Heavy, he’s in happy Heavy Heaven right now. Dohohoho.
In one of my more minor Heavy/Medic headcanons, Heavy is actually the one with the crossdressing fetish, enjoying it immensely when his lovers dress up for him. When he and Medic get together, he isn’t shy about mentioning it, and Medic is all like “vhat ze fack” at first, but he eventually dresses up for him just to experiment a little (and because he likes Heavy a lot and wants to please him). And after that, he’s hooked, or at least has no qualms about doing it some more.