Cool de M / Cold masochist

Asami Shiino, a cold, quiet, but attentive teacher, is quite popular due to her beauty and large breasts, though somewhat naive. Worrying about Masaki, a student in her class, she gets into a compromising situation. She is forced to jerk him off, keeping a serious face and justifying it as 'just work'. Despite being covered in his semen, her expression remains unchanged. Masaki, aroused, takes advantage of his teacher's naivety.