Amen
Maybe.. It depends on the cat Koma is female or not.
I don't understand why he just doesn't look into surrogacy.
Being gay doesn't mean you can't have kids. Just find a lesbian and get a turkey baster. Viola.
He looks kinda young so maybe he's not old enough to do that yet? And maybe surrogacy is not as common in Japan as it is in Western countries?
Maybe. But you would think with the problem of Japan's demographics that they would do something about increasing births by subsidizing invitro or surrogacy. Hell even adoption would work wonders for gays who want to raise a family.
The cat boy can't produce a heir to his shrine because he's gay, right? So how about if the seme (the caretaker of the zodiac animals) ends up impregnating him! I mean, they have supernatural powers while possessed so its possible!