VENU-991 — Drained Nonstop for Two Days and One Night by My Wife's Sister, Who Showed Up Unannounced

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After yet another marital argument, Atsushi's wife finally storms out of the house. Lost and unsure what to do, he receives a visit from her older sister Rin, who checks on him and offers some advice. She teaches him a secret for keeping a marriage happy, and a grateful Atsushi casually promises to repay her. That night, Rin makes him settle the debt with his body...