Ayane, the aunt, visits the Sugishita household for the first time in a while and is asked by her nephew Takuya to tailor a suit as a graduation gift for his new job. During the measuring, the slightest brush of the tape against his nipples causes Takuya to react sensitively. Noticing this, Ayane finds it amusing and can't help but repeatedly tease and play with his nipples. Naturally dominant, she begins deliberately tormenting his nipples whenever she gets the chance. Unable to resist these lewd acts, Takuya finds himself increasingly aroused and helplessly under her control.