After her mother died, Yukine lived away from home. But for the first time in a long time, she decided to go back to her parents' house with her stepfather and her younger brother. It wasn't long before she met her cute little brother and stroked her chest, but she soon discovered the secret of her stepfather and her brother. Her stepfather was bisexual. For her younger brother to be treated as her father-in-law's sex treatment, Yukine decides to take her side as her older sister...
