Recently, My Sister is Unusual

Farewell, Hiyori-chan (1x12)

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Mitsuki's his little sister, and Yukina is an older sister figure. To Yuuya, both of them are precious "family members". But on one morning of their stay at the hot-springs, Neko hypnotizes Yuuya to "be more honest", and he calls Mitsuki "really cute" and gropes Yukina's breasts.