My supposedly perfect sister, Rikka, came home after being dumped for the shocking reason of "lack of technique"! With her pride shattered, she takes her frustration out on the one person she looks down on: her "socially awkward, loner brother's" cock! From there, a 24-hour obsessive training session begins, throwing all reason to the wind. Right from the morning, she clings to his crotch, demanding, "Lend me your cock!" and sucks him dry with vulgar sounds, from cleaning fellatio to ball licking! She even rapes her sleeping brother in a spontaneous reverse sleep-fuck! What was supposed to be practice turns into a cock addiction, and she completely transforms, seducing him with the face of a female in heat...!? It all ends with consecutive creampies without pulling out! A sinful, relentless nympho training session!
