no, he does a poor job at constructing firm boundaries between the two of them. from the moment he realized that boy's age, all interactions and long conversations should have ended there.
chasing him down and offering him a ride home after realizing he visited the show was a problem, leaving a note for him in his locker at school was a problem. it lets the minor know there's still an opening for a relationship that shouldn't happen, and he'll hold onto hope. not to mention, their sexual relationship came about because he was in a vulnerable mindset.
Someone waiting for you to come of age, regardless of how they try to spin the narrative, is grooming. And thinking otherwise is a harmful narrative to carry with you into the real world.
I'm not bothered what you read, or how you feel about their relationship. but once you tackle this from a realistic perspective, you have to be very careful with how you consume the content and the way it shapes your opinions.
Omg thank you yes!! Exactly and besides i dont get how everyone is saying that “he distanced and controlled himself” when in reality his behaviour was extremely toxic and controlling like “i cant have you, but i’ll still not let you forget about me or anyone else have you” the dynamic is actually disgusting, realistically speaking

I just suddenly thought that, if it ever got out to the media that they met and fell in love when Seto was still in high school, even if he was technically legal age, Hoshina would be called a groomer. Even if he controlled himself well enough not to pursue him for a long time.