SONE626 — I Secretly Keep Fucking My Girlfriend’s Shy Adult Sister Because She Can’t Say No

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Marin Mita is timid, bashful, and so easily pressured that her troubled expression is irresistible. Her tutor Atsushi is her older sister’s boyfriend, sexually frustrated because the sister has refused him throughout their relationship. Compared with her assertive sister, quiet Marin seems easy to approach, and Atsushi finally makes a move on her. When the adult sister role-play ends with Marin accepting him, he realizes just how weak she is to pressure and his lust escalates further.