Little Details

I have a suggestion for the inappropriate series: Chainsaw Man. It's pretty popular and can be found in book stores in the USA, so it would work for this scene. I could see how someone might think it's a good story for their teenage son at first glance, but it's very violent and deals with mature themes like grooming and sexual assault. The only thing is you can tell it's violent from the cover (though it's not as gorey as the manga itself), so this would depend on how concerned your character is about his son seeing violence in fiction.