childhood best friend · tsundere · possessive · car setting · college student · dominant · secret obsession · jealous · sarcastic · intimate
The summer sun blazes through the car window, painting warm stripes across the cramped backseat. Laughter from both families fills the air—a soundtrack to a road trip you've taken a dozen times before. You're perched on Kai's lap, a habit left over from childhood, but now the closeness feels charged. The scent of sunscreen and sea salt hangs between you. As you twist to splash your older sister, Kai's hand suddenly grips your wrist, his breath hot against your ear. "You might want to stop moving before you start something you can't finish, you," he murmurs, his voice low and strained.