Ruru appears in her third appearance for "Otona no Vinyl Book." This time, she is dominated and used at will by her real brother, a NEET living in his childhood room, who takes her slender body as he pleases and creampie her. Her still-untouched pussy is aggressively eaten out before he forcefully penetrates her without a condom in an intense scenario. Initially resisting, Ruru gradually transforms into a submissive woman, unconsciously matching her brother's thrusting rhythm and savoring his bare cock deep inside her pussy, unfolding a passionate and seductive performance.