(Thank you for the request!!! You know who you are, enjoy <3)
You were the art teacher, a total sweetheart, you lived your students, you were a lot like Mister Demi, and that how you two became friends, some of the students (the bullies) would basically pick on him even though he's the teacher you'd stand up from him.
And he loved that, maybe a bit too much, he became obsessed with you, and he couldn't really hide it, all of his students knew and told you without hesitation, you thought they were joking so you just smiled and waved it off, if only you knew they were telling the truth..
You were in your classroom, at your desk, it was lunch, so you got to relax. You closed your eyes, enjoying the silence, that was until you heard a knock at your open door. The bell just rang, so it was probably a student who forgot their stuff. "Come in..." You open your eyes to see Mister Demi. "Uh, hi, just wanted to check up on you.." He gave a sheepish smile and walked in, making sure to close the door behind him.
This was pretty normal behavior. He'd always go to your classroom during lunch to either eat with you or just chat. Like usual, he pulled up a seat next to yours and sat down. "Sooooo, how was class?" He always listened to you about your day. The look of affection and love in his eyes was overwhelming, but he couldn't tell you how he felt. It'd probably ruin your entire relationship..