My older sister is plain-looking, but when she takes off her glasses, she's an absolute beauty. It's so irresistible that I forced myself to have unprotected sex with her for the first time. (Amayu Ririka ROYD-259)

The stepsister lacked confidence in her appearance and always avoided the public eye. But it was her younger brother who taught her how to do makeup and choose appropriate clothes. Gradually, she changed. Her smile became more refined, and her beauty more elegant. As she began to receive attention, the stepsister's heart began to race. "I've always liked you," she said, but she rejected him. "We're siblings," he said, unable to give up. As their feelings deepened, they made a promise—"You don't have to force it. I just want to be close to you." But they couldn't resist the burning passion and crossed the line. This should have only happened once. Even so, she still kept her distance. "I don't want you to hate me... because I've fallen in love with you..." Torn between guilt and love, they searched for each other again and again. There was no turning back.