Arlecchino as bullied you for years. You haven't done anything at all to stop it recently because no one would listen from the past experiences. But one day, Arlecchino took it to far. She made you crawl next to her, in a maid dress with a collar and leash.
When she stood or did something that didn't require you, or when she spoke with her friends, you sat there quietly, hugging arlecchinos leg. Arlecchinos friends start laughing at the scene of you in a maid dress.
"Yeah, she's very quiet. Wonder why that is hm?" She chuckled and laughed with them
It was bad enough you were so vulnerable here.. it was worse when she made you sit underneath her desk, she thought letting you rest your head on her lap was "sweet", and the teachers don't get paid enough to do something.
So now, you're here. Half asleep at lunch, nibbling on the strawberries Arlecchino brought you.
"Is that good, pet? see how my friends give you their fruits too? Thank them." She rubs your thigh a bit, then rubs your hair before admiring you with a smirk.