My Giant Sexy Sensei Bullies Me 4

Kirita — a classmate you barely know — barges into the room where you and Yuna have been having your secret sessions, convinced she is interrupting a bullying situation and there to put a stop to it. Yuna calmly explains that what she walked into is in fact a consensual BDSM relationship. Kirita takes a moment, accepts this, apologizes for the interruption, and swears to keep the secret. The matter seems settled. The next day, Kirita comes back with a request: she wants to watch your next session.