ENHYPEN FF || Nishimura Riki x Y/n || 18+ They became step-siblings the day their parents said "I do." Y/n never asked for a new house, a new family, or a boy who looks at her like she's the problem he didn't choose. Riki never asked for a stepsister who talks back, takes up space, and somehow makes the silence between them feel louder than any argument. They agree on one thing only: they don't have to like each other. They just have to survive under the same roof. What starts as cold rules and sharp words slowly turns into something neither of them wants to name. Late-night tension. Stolen glances. A jealousy neither will admit. And a line that keeps getting harder to see. Enemies don't get jealous. But Riki and Y/n were never very good at following their own rules.