Dude, you are literally born wanting to already fuck, while Malice has no clue about sex and has shown no interest or understanding in it, you can see it when you leave one of the unhappy captives and she asks you about why are they imprisoned and you sort of dance around it - because she's a fucking child. You are not.
On top of that, Malice is clearly not a baby, she's born aged equivalent to about a 5 year old in human age. She can speak and asks lots of questions about the world, we can pretty confidently reason about her maturity.
And to add on another detail, you grow pretty naturally over time, while Malice accelerates her development through time-travel space-time fuckery, her suddenly turning into an adult is not something natural for her species if it makes any sense to reason about the nature of reality breaking abominations.