He secretly and continuously penetrates his introverted, shy, and immature girlfriend's younger sister, even when she's at her worst. (SONE-822)

It was my first time visiting my girlfriend's house. Her younger sister, Saki, was dozing off, completely unsuspecting. My gaze was drawn to her slender thighs peeking out from under her skirt. Her skin was translucent, her ankles delicate and supple. My fingertips lightly touched her youthful body, and Saki trembled with fear. "No, no…" she cried out in terror, her tearful eyes and the way she desperately struggled with her slender arms further shattering my reason. Her fragile strength only fueled my desire, and before I knew it, I had her shoulders pressed down. Finally, she trembled slightly, her fingers intertwining as if trying to grasp my arm tightly, her slightly parted lips emitting a sweet sigh. Her hesitant reaction was irresistibly alluring, and before I knew it, I had devoured her delicate body again and again… there was no turning back.