[Toneri Dan (Yoshio Ereki)] Imouto to Game o Suru, Soshite Mama to Sex o Suru [A Cool Person]

Akira splits his time between innocent games with his bubbly younger sister Reimi and a consuming secret affair with his gorgeous, big-breasted mother Kyouko. Before he knew it, shy glances over lacy lingerie and desperate, devoted oral moments had become irreplaceable, until the day he must decide to leave threatens to unravel their intimate domestic balance. Torn between Reimi's playful calls for her onii-chan and Kyouko's soft, milf curves aching for his reassurance, he finds their forbidden bond growing deeper and harder to leave behind.