After you Adopt them they are yours.
You can do WHAT EVER.
But keep in mind they are as intellegent as Humans. but they act like a mix of Human and Cats
yeah.
But it wouldn't really be Incest- cause they aren't related to you-
and zoophilia is with ANIMALS not Neko's. Cause Neko's (if they were real) are people too.
but yeah I recomend sticking to maid job :/