My supposedly perfect sister, Rikka, came home after being dumped for an unexpected "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 blowjobs to licking his balls! She even sneaks in at night to have reverse sleep-sex with her sleeping brother! 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!
