Plot twist: Turns out that this is unrelated to his original gender, and it just so happens that they're at a cursed hot spring where a boy drowned. He just has to splash herself with cold water and he'll turn into a girl again.
It doesn't. Nor does obsessive reading of gender benders, concluded with leaving a comment that "it's gay" to reassure yourself about your standing. So.
I have nothing against 100% gender benders (and usually ignore the "gender does not matter" bullshit), but less than 100% is obviously gay, dude. That includes the futa or trap stuff.
i wanna say he's mistaken and may not realise that he's feeling the same thing but as a woman, and that it hasn't actually grown back. just have to wait till next chapter.