Many years ago, Mio had sex with her younger stepbrother Keisuke for the first time. They currently live in a shared apartment and now Mio works as a teacher. The student Ayano seems to have consciously or unconsciously misunderstood some of Mio's remarks and therefore asks Keisuke for help. He is supposed to do something to make her breasts grow and kneading the breasts is far from enough, especially since Ayano believes in every word of her teacher Mio in this context...
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