They do exist, but with some caveats. Usually they’re instantanous transformations or take place during an accelerated period of time. You’re also less likely to find ones about fem or flambouyant guys and more about “average” guys. Plus they range from becoming a frat bro to a military man, to a leather daddy so its a much wider category.
The biggest issue i think is that they’re much more likely to veer into homophobic stereotypes or outright gay to straight. So if those don’t bother you you’ll have an easier time looking. Rozza’s stuff has some of that, for example.
I think in general feminization has an easier time because we all know what it looks like, its fun to take a straight guy or masc gay and make him a flambouyant stereotype or sissy, and its less likely to veer into uncomfortable territory.
Good luck looking and I’ll post some if i see it.