ナマイキ巨乳J●が「おしっこ漏れちゃうっ！」⇔「イクっ！」を繰り返す放尿快楽ループに沼る！バカにしてた童貞兄の目の前でお漏らししてしまった妹、瑠花。その姿に興奮した兄のおしっこを拭うようなクンニ＆禁断の生チ●ポ挿入に羞恥心も相まって気持ちよくなってしまう。「い、イッたの？」「し、知らないよそんなの、マジで変態！」やがてお漏らしが快楽のトリガーになった瑠花は家でも外でもお漏らしするようになり…

A sassy, big-breasted JK gets caught in a loop of urination pleasure, repeatedly going from "I'm going to pee!" to "I'm cumming!" Ruka, the younger sister who used to make fun of her virgin older brother, wets herself in front of him. Excited by the sight, her brother wipes up the pee with cunnilingus and then inserts his bare penis, making her feel good as her shame is amplified. "Did you… did you cum?" "I… I don't know anything about that, you're such a pervert!" Soon, wetting herself becomes a trigger for pleasure for Ruka, and she starts wetting herself both at home and outside…