A threatening letter arrives to female teacher Ashina, who has had sex with a male student Shiina secretly filmed, and she falls into the abyss of lust. Higashikawa, a male student who has been voyeurizing Ashina for a long time, forces her to have sex only once with a promise not to fall apart. Higashikawa, a busty nipple maniac, makes Ashina take an aphrodisiac that makes her nipples abnormally sensitive, and begins to caress her nipples with fingers and tongues. The nipples that have been blamed are developed sensitively enough to immediately cum and continue to be erected all the time. The promise of only one day is broken, but Ashina is forced to accept it, falling into pleasure and unable to suppress her lewd inferiority. She finally becomes an irresistible horny teacher who wants her nipple orgasm...