That and/or he’s trying to fill a need he’s not getting from his life, addiction normally stems from a deeper set issue like lack of connection with others or loneliness
I don' think so.. It's common to have AVs and he's just shocked he got someone so his type as a kouhai. The delusions are intrusive thoughts as he really shows to be bothered by them and don't want to keep having them
Is it safe to assume he's got porn addiction?