Thank's for response.
It's easy to explain, because it gives not really incest in the game, it gives no love or share routes for her.But it's a Simulation/RPG and she is a Teenager. You have influence on her reaction on you with your choices that makes other routes possible (in the future with her best friend or the sister of her Boyfriend ) And of Course you can avoid to see explicit scenes. Some more informations are in the FAQ.
Best regards