Before summer break, adult student Saki is summoned by her homeroom teacher Takagi, a creepy middle-aged mama's boy. He warns that her attendance and grades may keep her from graduating, then uses mandatory summer tutoring to threaten and humiliate her. Forced to arrive without a bra, she has her stiff nipples slowly kneaded, pinched, and licked until even the slightest touch makes her cum and lose control of her bladder. The nipple torment continues through oral sex, penetration, and every orgasm.