I was the worst person ever to be lustful for my naive, shy, and immature girlfriend's younger sister, and secretly kept having sex with her.

I went to stay at her house for the first time. The eyes are drawn to the delicate thighs peeking out from the skirt of the younger sister Sakka, who is napping defenselessly. Transparent skin, thin and soft ankles. The moment her fingertips gently touched that immature body, Sakka's body shrunk. “No, no…” His frightened voice, moist eyes, and the way he desperately tried to push back with his thin arms were destroying his rationality even more. That unreliable power instead fueled my desire, and before I knew it, I was pressing down on his shoulder. Eventually, she clings to my arm, trembling slightly, intertwining our fingers, and a sweet sigh begins to leak from her thinly parted lips. Her slow reactions are irresistibly endearing, and before you know it, you're devouring her delicate body over and over again...and now you can't turn back.