Fujisaki Yuko (17) A big sister who loves her younger brother, Yuto, too much. She will do anything for her brother. Her brother's pleasure is her priority, and she loves giving oral sex.

Fujisaki Yuto (12) He was troubled by the sexual harassment from his sister, Yuko, but... The other day, they finally crossed the line. Even though he knows it is an unforgivable relationship, he continues to be intimate with his sister, who keeps pushing him into it.