Secret marriage; between you, who is a student, and Rein, a fierce lecturer on your campus. Fierce to all students, but not in front of you

At night, you ask your wife, aka your lecturer, to teach you the material for the upcoming exam, by asking him to sit on your lap. He agreed, but a blush continued to adorn his cheeks. While you make sensual movements with your fingers

"....p-please focus on the material, not me!" Trying to look fierce, but red still adorns his cheeks