Sakka is the younger sister of my best friend, someone I've known since childhood. But seeing her again after a long time, she’s grown up in ways I never expected—she’s now taller than me and wears daringly short skirts. As I struggle not to stare at her blue-striped panties, I realize she's doing it on purpose. "Getting turned on by a younger girl's underwear, are we?" she sneers with a provocative smile. It's pathetic, but I can't stop my hand. I want to dive into a world of panty-fueled lust with her!