[Natsuzou] A story about an older sister who can't refuse her Brother's requests because he has a strong sexual desire

An older sister with a voluptuous figure and long dark hair returns home to her younger brother, who greets her with an eager kiss and a plea for help "holding out." Their playful sibling dynamic quickly escalates from fondling and oral play into deeply intense, messy encounters that leave her flushed, panting, and utterly devoted to pleasuring him. The tender but shameless intimacy between the two culminates in overwhelming climaxes, showcasing a closeness that borders on romantic obsession.