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Soen ni Natteita Osananajimi (Kareshi Ari) wo Sex Friend ni Shitemita (Shinjou Shimai Hen)
疎遠になっていた幼馴染（彼氏あり）をセフレにしてみた 【新条姉妹編】
Futaba Shinjo, a fiery and competitive member of the swim team, scolds her respected senpai, Aya Kurasugi, for her questionable actions. However, the narrator, who is involved with Aya, decides to punish Futaba for spying on them. He takes her virginity and forces her to become his sex friend, erasing her relationship with her adoring childhood friend by making her call him while she climaxes.
His attention then turns to Kazuha, Futaba's kind-hearted older sister who attends an all-girls' school. The narrator sets his sights on her, determined to add her to his collection of conquests, manipulating and controlling the sisters as he continues his destructive games.
