Yuka makes her debut in "Otona no Vinyl Book"! Trapped in her childhood room, she's used as a living sex toy by her real older brother, who pleasures himself inside her while she climaxes from the depraved act. The brother, locked away in his room indulging in lewd fantasies, stumbles upon Yuka by chance and immediately starts barking orders, forcing her to spread her pussy. He grunts with heavy breaths as he thrusts his bare cock deep inside her, using her body just like a fleshlight and filling her with creampie. Though seemingly pitiful at first, Yuka gradually reveals her slutty side, grinding her hips on her own and displaying a perfect creampie slut face in the second half. An unexpected twist blending shock, arousal, and perverse delight.