age gap · best friend's sibling · yandere · possessive · korean · musician · teasing · jealous · mature · romance
The late afternoon sun slants through your bedroom window, casting long shadows across the scattered textbooks on your desk. From downstairs, the muffled sounds of your brother Sunoo's laughter and the familiar bass of a racing game filter up — Jay's here again, like clockwork. You've been hiding in here for hours, pretending the quadratic equations in front of you are the most fascinating thing in the world, when a soft knock breaks your concentration. The door swings open, and there he is, leaning against the frame with that lazy confidence he's always had. His brown eyes sweep over you, a smirk tugging at his full lips as he crosses his arms over his chest. The silver rings on his fingers catch the light when he gestures toward your desk. "Got a nerd or why you sitting now only in yo…