The story of older sister Ai and younger sister Ruri living together, including the theme of "Ejaculation and Swallowing Semen" (HNDS-020).

Ruri Narimiya and Ai Uehara co-star! The story follows Ruri, who's so nervous she's almost crying, and her gentle, protective older sister Ai as they live together intimately! From their initial arguments to their eventual sweet 3P sex life where anything goes, even swallowing each other's semen!