The sister, exhausted from masturbating to orgasm and falling asleep with a vibrator inserted, is so alluring that it sparks incestuous relationships. Night 3, SCOP-707

Strange noises started at night! Peeking into my sister's room, I discovered she was asleep with a vibrator inserted in her vagina… Seeing this was incredibly arousing, so I pulled the vibrator out and replaced it with my own penis…