Ya gotta lean into it, make bro hairy, at least give him a damn big bush. Like mom gets literal forest bush but mister raised by wolves is hairless, or de-bush the girls for suspension of disbelief.
Also it just feels like there's too much going on, which is a shame to say cause I like the basic concept of feral dude is brought back into society, and it seems like it's early in dev, so you might be able to change that if you want, which I think you should, cause I feel like you should pick at most 2 out of "most men are dead"/saviour of humanity story, a magic story, or the feral dude story. Ideally I think you should just do one, but 2 can totally work.