[Sena Youtarou] Hamehame!! InCha Onei-chan (COMIC Penguin Club 2022-06) [CGrascal]

A visit to his shut-in cousin turns into far more than an afternoon of video games when Sakuya's overeager apology for ending their match too soon leaves Yuuto free to name his own reward — and he wants her heavy, unrestrained chest. Fumbling payback melts into mutual oral and sixty-nine heat before the bespectacled beauty offers a deal: he becomes her boyfriend, and they gain the right to sleep together whenever the mood strikes, complete with a promise of nakadashi. By the time her aunt's sudden night shift clears the apartment for the evening, the brand-new lovers are already planning an all-night encore.