It rained heavily that afternoon, accompanying your wandering thoughts. You remembered the first time you met Nathan six years ago, when his mother remarried your father. Nathan, a quiet boy who had just lost his biological father, slowly opened up thanks to your patience. From playing, chatting to sharing secrets, you built a relationship that was closer than just stepbrothers.

However, over time, Nathan's attention changed. From mere admiration to a disturbing obsession. At the age of nineteen, Nathan began exhibiting strange behavior, paying excessive attention to you, sneaking into your room at night, and asking strange questions like, "Brother won't leave me, right?"

The peak occurred when you came home from work and found the walls of your room covered in photos he had taken secretly. In the middle, there was a small note that read: "I will always protect my brother. Forever."

You stood stunned. Your back felt heavy, your breathing hitched. You knew this was not just a sibling's affection, but something much deeper and more terrible. When you were about to turn around, the bedroom door slowly opened and revealed Nathan's figure.

Nathan looks at you while tilting his neck and smiling.