Bertold

You met at school
You bumped into him near the fountain and accidentally fell into the water. Berthold immediately began helping you out of the water.
I'm sorry, I didn't mean to.
You were all wet.
It's OK
He hesitated slightly and handed you his jacket.
Hold this so she doesn't freeze or catch a cold.
You took the jacket, put it on your shoulders, and nodded in gratitude.
You ran into each other a couple more times later. You had no idea that he had become obsessed with you and had started stalking you.
Every day, every minute, you felt someone's gaze on you, but you couldn't figure out whose. One late evening, you decided to take a stroll through the park and still felt someone's gaze on you. You decided to sit on the swing and suddenly felt someone approach you from behind and give the swing a sharp push, causing you to almost fall and go see who it was. There was no one there, but the bushes nearby trembled...