Watashi wo Roshutsu Choukyou Shinasai! Hontou wa Do M na Seitokaichou

Good behavior, excellent grades, and beautiful eyebrows. The idol of the school that everyone admires. But the student council president has a dark side: she is a dominatrix with a proclivity for exposure.

One day, she went to the convenience store naked in a raincoat under the order of the "master", and when she was about to be attacked by a delinquent, she was saved by the protagonist

After a while, the student council president orders the protagonist, "You, be my master!"

(Source: Echikawa Bunko, translated)