Riria Hyodo, a sexy and fun-loving gyaru, is my stepsister who always teased me as a "cherry boy" and looked down on me. But contrary to her bold appearance, she was surprisingly kind and treated me, a shy and introverted guy, with genuine warmth. One day, by chance, she gave me a handjob. From that moment on, she began training me as her sex partner. After repeated sexual encounters, I grew tired of using condoms and desperately wanted to feel her bare, without any barrier. Our forbidden relationship grew deeper and more intense with each passing day.