After female teacher Renami was blackmailed for being secretly filmed having sex with male student Shinami on school grounds, she falls into an abyss of lust. Toshikawa, the male student who had been secretly filming Renami all along, coerces her into having sex with him just once in exchange for his silence. A giant breast and nipple fetishist, Toshikawa makes Renami drink an aphrodisiac purchased online that heightens nipple sensitivity to abnormal levels. He begins to tease her nipples with fingers, tongue, and toys. The tormented nipples become so sensitive that they reach orgasm instantly and remain erect continuously. Although it was supposed to be just for one day, Renami finds herself unable to resist the pleasure and accepts it, her lewd desires becoming uncontrollable. Eventually, she even seeks nipple orgasms on her own, turning into an insatiable lustful teacher…
