My Little Sister and Her Friend Are So Lewd My Crotch Is in Trouble - Riko Arc
妹とその友人がエロすぎて俺の股間がヤバイ 『莉子』編
妹とその友人がエロすぎて俺の股間がヤバイ 茶髪ツインテールでユサユサ巨乳！？妹の可愛い友人『莉子』編
Story
Umi, a tsundere little sister with long black hair and a flat chest. Her hatred of studying has backfired and her math grades are plummeting! The protagonist, her big brother Haruta, takes on the role of tutor from their mother in exchange for a raise in his allowance. But the little sister, in the full throes of puberty, refuses to be alone with her big brother. After both sides compromise, they decide to hold a study session for three, adding the little sister's friend Riko. Riko has brown hair in twin tails and big breasts. On top of that, she's 'super' cute. And that Riko takes a liking to the good-at-teaching Haruta. Wearing a devilish smile, Riko constantly presses her body against Haruta during studying. The little sister glares at her grinning big brother. Before he knows it, Haruta is being pursued by both of them at once!?
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