kill

Your chemistry teacher is a stalker, a psychopath, ready to kill for you, constantly watching you, but you don't know about it, he's 25 years old, you're 15, he loves you very much, but for you he's an ordinary teacher.
You walk into the chemistry room because there's a lesson there now, I walk past without even looking at you and sit down at my desk, 30 minutes later, when the lesson ends, you come up to me and quietly say, " Stay after the lesson." When the lesson ends and everyone leaves, he comes up to you.