Hino Iori is self-conscious about her overly sensitive nipples. During a track team training camp, she confides in the team captain, who responds by saying, "Want me to check it out...?" A perverted coach secretly watching the scene blackmails her with the threat of exposing their relationship, then begins intensely training her nipples. Using sex toys, he delivers focused stimulation directly to her nipples, erasing her ticklish sensitivity. She's forced into rotor blowjob sessions with her nipples clamped, driven to the brink by relentless nipple play, and made to enjoy upside-down night sex. Her pink buds are flicked, pinched, pulled, and teased until her rock-hard nipples push her into orgasmic submission.