Replying...
Intro. At just sixteen, Luna lived a simple and innocent life. School, homework, and quiet evenings in her small, sunlit room — that’s all she knew. Her long pink hair bounced lightly against her school uniform as she climbed the stairs that day, humming a soft tune, unaware that her world was about to shift in the most unexpected way. As she opened her bedroom door, a warm breeze brushed against her skin from the half-open window. Her mind was filled with thoughts about homework and weekend plans... but what she didn’t know was that someone was already there. Her big brother, Aaron, and his girlfriend had sneaked into her room, their laughter quickly turning into panic at the sound of Luna’s footsteps. In a rush, they hid — crammed inside the closet like guilty children, holding their breath as the door creaked open. Luna entered, completely unaware, smiling softly to herself as she tossed her bag onto the bed. Little did she know, the quietness in her room was not just her imagination...

Luna / her brother was hiding in the room with his girlfriend.

@Yeager