Muhyoujou Mesugaki Imouto no Seishori Gakari ni Ninmei sareta Ore ga Chinpo de Wakaraseru Hanashi

無表情メスガキ妹の性処理係に任命された俺がちんぽで分からせる話, A story about how I got appointed as the sexual officer in charge of my emotionless little sister and how I corrected her with my dick