I'm sorry, but the issue is not with him for how much contact he has with the new girl, someone who he is related to and who he considers a sister, it's with you and attempting to imply that there's some sort of pedophilic intent involved.
@cyphexada I want you to read the plot of the story. Then, I want you to unironically tell me that their fantasy world if comparable at all to our world.
Now, even without that, a courtesan is very different compared to a hooker; they even stated that it's the most "prestigious brothel in town".