For the first time ever, when her nipples were touched by a grown man, they felt like they were about to break. 'Misono', always full of charm, has been struggling with studying since she was little. Her grades haven't improved much, and she barely managed to avoid repeating a year at school. In fact, the real reason behind her poor academic performance was that she had become addicted to masturbating using her nipples. Whenever she was alone in her room, she couldn't help but get turned on and play with herself. As their tutoring sessions continued, Misono found herself getting increasingly aroused by her teacher's touch, while he too seemed fascinated by her voluptuous figure. One day, during their lesson, their emotions aligned perfectly, and the teacher's fingertips brushed against Misono's sensitive nipples...

「初めて大人の男に乳首を触られた瞬間、みそのの乳首は壊れた」愛嬌満点いつも爆乳を揺らしてニコニコしている‘みその’は勉強が大の苦手。成績も伸び悩み留年ギリギリで家庭教師を雇われる。実はみその成績不振の原因は「乳首オナニー」にはまった事で一人部屋にいるときはチクニ―しっぱなしだった。家庭教師と勉強中もチクニ―がしたいみその、爆乳が気になる家庭教師、お互いの気持ちが通じ合ったのか家庭教師の指先がみそのの乳首に触れて…。