堇和麻衣在課堂上害羞又低調，但當她們敏感的乳頭被發現後，她們每天都會被欺負者嘲笑。當她們決定向班主任請教時，卻意外地獲得了以「改善乳頭結構」為由發育雙乳頭的機會！她們雖然長得普通，但乳頭卻硬得像石頭一樣……她們得適應各種刺激……（笑）作為好朋友，她們應該互相舔乳頭……考試時還得戴上玩具……反复的乳頭發育最終以兩人都尿濕自己結束！抽搐！ ！雙乳頭高潮！ ！ ！
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