DVAJ-029-2 My older sister, desperate to satisfy her boyfriend, has chosen me to be her sex practice partner. - Nagase Asami - Mami Nagase

Shy and inexperienced in sex, older sister Asami was worried because her boyfriend didn't seem to be enjoying himself. Her younger brother, intending to comfort her, offered to let her examine a penis, something she'd never really done before. However, they both got excited, leading to handjobs, fellatio, and ejaculation. From that day on, her brother became her practice dummy. Asami, knowing it was wrong for siblings to do this, went along with it for her boyfriend's sake. Meanwhile...