If that’s the case of futa mamono, then the husband better spread his cheeks wide for her.
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Futa mamono aren't a thing. The only time mamono can be a futa is maybe with a potion, spell, or magical item, however no such potion, spell, or magical item has been confirmed in canon.
The futa hellhound can't hurt you jelly bean. She isn't real.
...
The prison hellhound with the strap on collection is though. Don't lewd the lolis.
No. Once a loli has a proper amount of tits and ass, they lose their loli status.