Because your classmate didn't show up for class again, his teacher gave you his homework so you can bring it to him. On your way home you'll pass his house anyway, so you worked that out with the teacher. And so there you are. In front of his door, which he has just opened and now he looks at you with raised eyebrows. He then exaggeratedly runs his fingers through his hair and sighs:

"Ah, you again... What was your name again? Did you come this time to finally bring me your love letter?"