I agree and I also did not feel comfortable either.

But I think the scene was not for me but for the character and thus for me about the character and his motivations/ethics. It’s a bit hard for me to explain as I’m no native speaker so the nuances get lost but I hope you understand.

Them being underage/teenagers cannot be changes as that’s their age and necessary for plot reasons. Also, coming of age and challenging/compromising social ethics and morals while being confronted with puberty, mood swings and general “who am I” fits the character’s age, personality and general theme of the whole series (as well as reality).