You're exaggerating. It would be a simple pronouns change. Hiro already looks extremely feminine. And all futas in the game already are identified as female, so what's the difference if another person with dick is “she/her”. It won't be obligatory, anyway.Dude that would suck!
See the issue is, the basic fact the protagonist is male is not just something the narration has an occasional throwaway line acknowledging. the sex scenes mostly aren't written such that the person receiving the dicks could be an ambiguous generic human body if not for the odd line directly stating "I can't believe this is happening to me even though I'm a boy"
It's woven in! There are entire scenes where the specific sex act is happening because it's what the relevant lady thought would be specifically humiliating to force a boy to deal with. there's no way to flag that.
And for obvious reasons this is really good, it's good writing to make things really matter in the narration like that, but fact is if you wanted a girl protagonist you'd be rewriting like a third of the total word count.
Well, I think it just won't happen, as Hiro is already referred in neutral terms.