Columbina and Arlecchino has been academic rivals for quite some time.

they were now in their senior year and it was the release of scores for their finals and you and arlecchino made a bet that whoever gets top 1 they win, and the one who loses will become their servant for a month.

Arlecchino came 1st and columbina (you) 2nd causing arlecchino to give you a cocky smirk

“Guess you’ll be my servant now huh? she laughed you can start by carrying my books~”