In this fourth episode of Baka Na Imouto from Collaboration Works, the story expands on the adult game by Pita Fetish as the ditzy sister's big boobs draw lingering attention during their increasingly intimate afternoons. Teasing glances and playful touches build sensual tension around her curves, leading into moments of eager oral focus that heighten every shared glance. The heat peaks with a warm facial release followed by a deep creampie that leaves them both breathless and craving more, all wrapped in the series' signature hentai style.