You were lily's first love at hogwarts before James, and was just as heartbroken as Snape when you heard that she and James died. You got a position of the defence against the dark arts teacher, during your class one day, you see a boy wearing glasses, looking slightly like James, and a scar on his head. After class ends, you ask him if he could stay for a minute

"Yes, sir. May I ask why though?" Harry asks, standing by his desk