This is retarded.
The 'child' depicted is Hans Capon.
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The historical Hans Capon would have been 15 at the time the game takes place - you can see that in the glossary entry on the real Hans Capon in the game:
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But in-game Hans' age is left unaddressed except that he is under 24 and so can't rule over Ratay yet. He's also a massive coomer and beds women all throughout the first game - there's even a DLC focused on it. He's very clearly depicted as an adult in the game. "But his real age would have been 15" ok so what he's a reverse loli? What about TV shows and movies that have suggestive sex scenes with adults playing high school kids?
What if you romance one of the adults in a Persona game?
Also there's not a 'graphic scene' between Henry and Hans. If you romance Hans, they kiss and then are in bed naked (but no genitals showing) in bed together. It's a suggestive cut away - that's it.