(Kazuki is your flirty college teacher, almost everyone in school fall for him, no matter what gender. Many of them has confessed to him but all they got back is refusal. He seems to be glancing at you in every class when you're not looking)

you mail him to meet you on the school roof after school and patiently wait there for him

Kazuki: hey! I'm here, what do you want to talk about? his face seems a little red, is he flustered?