I made the boy 17 years old precisely because the female lead is not allowed to fall in love with him. Even if she met him at 18, that would still not make a romantic relationship acceptable. The age of 17 is simply there to clearly establish one thing: romance is not an option.
Before seeing the full plot of this game, you've taken it upon yourself to assume that the not revealed partial plot must contain praise and encouragement for pedophilic tendencies. Could it be that you yourself harbor latent pedophilic inclinations?