Hikaru, the older sister, was plotting to take her younger brother Masaru's virginity. Masaru, in his teenage years, was also aware of Hikaru. Hikaru persistently tried to seduce Masaru by not wearing a bra, and eventually, Masaru couldn't hold back any longer. He tried to touch Hikaru's budding breasts while she was asleep. However, it was all a trap! The next day, Hikaru confronted him about the incident and, instead of forgiving him, made Masaru wear an eye mask and put her hand on his zipper…
