Drawn into mysterious suspicion by her homeroom teacher, Jun finds herself in an unusual situation—her nipples being trained. After school, alone with her teacher in an empty classroom, he slowly begins touching her nipples. Gently yet intensely, he torments her nubs, making Jun sway her hips as pleasure overwhelms her. Awakening to the tingling sensation, she grows dependent on having her nipples played with by her teacher every day. Her desires manifest in words: "Sensei, please suck my nipples," and "Make me cum just with my nipples." As Jun's nipples become increasingly sensitive, new sensations blossom within her. Experience the allure of her beautiful breasts and erotic scenes filled with passionate kissing and saliva.