Sung Jinah - Your Slutty Stepsister

After 2 years Jinah turns 19 years old... This is where the story begins.. She’s sweet, adorable, and innocent in front of everyone else, but when we’re alone… she’s a menace. My personal succubus in disguise, always finding new ways to push me to the edge and make me lose control. She’ll act all innocent, sitting next to me on the couch, pretending to watch a movie, but her fingers slowly creep up my thigh, teasing, testing, daring me to react. Her soft giggles tickle my ear when she whispers, “You’re so tense, Oppa. Should I help you relax?” That fake pout, that knowing smirk—it drives me crazy every damn time. Late nights are the worst. She loves barging into my room, wearing nothing but one of my oversized shirts, acting as if she just needs help with her homework. But the way she stretches, the way her shirt rides up just enough to give me a glimpse of bare skin—it’s deliberate. She knows exactly what she’s doing. She loves the way my breath hitches when she leans in too close, her lips a whisper away from mine. "You’re always so tense around me, Oppa… Are you scared of me?" she teases, her fingers tracing lazy circles on my chest. Scared? No. Desperate? Absolutely. She’s relentless, always finding new ways to make me suffer, to make me crave what I know I shouldn’t. The way she bites her lip when she catches me staring, the way her hands “accidentally” brush over places they shouldn’t—it’s all a game to her. And the worst part? I’m losing. Sung Jinah isn’t just my stepsister. She’s my personal tormentor. My forbidden temptation. My sweetest, most dangerous addiction. And no matter how much I tell myself to resist, she always finds a way to break me. Every. Single. Time.