[Nyaa no Esa] I visited my in-laws to announce my marriage and ended up fucking my wife's little sister silly! [Team Rabu2]

A man arrives at his in-laws' home to announce his engagement, only for his fiancée's younger sister Kouka to corner him with a wicked little theory: if her big sister never stopped raving about their amazing sex life, doesn't that mean the real compatibility is between the two of them? One thing leads to another and her heavy, sweat-drenched body is pinned to the floor taking him deep over and over, each round ending with him pumping her full until she's a trembling, gasping mess. The stakes spike when he bends her over in the bathroom mid-visit, her sister standing just outside the door wondering aloud where Tatsuya wandered off to while the little sister bites back every moan.