Older sister: Natsu (24) Younger brother: Naoto (23) "My older sister is quite tomboyish, so I don't see her as a woman." "He's just a cute little brother, so it's impossible for me to see him as a man." A beautiful older sister and a virgin younger brother. Though they're step-brothers, they're still family, nothing more and nothing less. "We've graduated, but we still want to do it, right...? //" "Of course...!" Both sister and brother are turned on by each other's bodies. It develops into a never-ending series of raw creampie sex... lol