ROYD-216 Teasing the Pure and Shy Little Sister Day After Day, Turning Her into a Hypersensitive Prematurely Ejaculating Body with Endless Orgasms! Finally Revealing a Lewd Expression, Completely Transforming into a Pervert - Kokori Kitaoka

The film follows the male protagonist as he relentlessly teases and trains his pure, introverted younger sister, transforming her originally innocent body into one with hyper-sensitive, premature-ejaculation-prone physiology. Under continuous stimulation, the sister gradually succumbs to pleasure, experiencing uncontrollable orgasms and ultimately revealing a lewd expression, fully evolving into a perverted sex slave. The plot centers on the taboo brother-sister relationship and the body modification process, depicting the psychological shift from resistance to submission.