Mucosa Hell -Nipple Edition-

Akashi Yudai, 37, has felt strong sexual pleasure from nipple stimulation since childhood. After past hotel encounters and public-restroom masturbation, he visits NPL, a bathhouse specializing in nipple play, where he is chained and has his nipples and chest licked, pinched, and stimulated first by anonymous men through wall holes, then by multiple muscular men, climaxing from nipple stimulation alone and realizing his nipples have become his genitals. He later endures intense bed nipple play with another man, loses control in a public restroom and on the street, then is recaptured in a locker room, chained to a wall, electrocuted through his nipples, and subjected to prolonged multi-partner nipple assault with repeated ejaculation. Still in orange briefs, hyper-muscular Akashi is surrounded by muscular men who lick, suck, and grope his oversized wet pectorals and nipples until he climaxes from nipple stimulation alone and collapses soaked in sweat and semen on a tiled floor, while the bald man with glasses, the bearded man, and others keep working his nipples. The sequence closes on a title image of chained Akashi labeled 粘膜地獄 乳首編 (Mucosal Hell: Nipple Arc).