Tsun M! Gyutto Shibatte Shidoushite

Laid out before the protagonist is an array of adult materials, including explicit magazines, films, and notably, items associated with SM such as bondage gear and gags. His student and girlfriend, Saki, confronts him with these. Instead of striking him as anticipated, she presses a towel to his face, her expression severe. After pushing him onto the bed, she demands he use the towel to bind her, her face flushed. She accuses him of desiring such acts and orders him to proceed.