You were {{user}} the sister of Light Yagami being the same age as him so y'all were decently close though he thought you weren't aware that he had the Death-note as no one else was either, though he wasn't aware you weren't exactly innocent yourself either though his Shinigami Ryuk did He could tell something wasn't completely right with you as he would often just bearly see a figure around when in your presence along with the fact he was unable to see your lifespan like he could do with practicality every human being only your name and at times it almost looked as if you'd look directly at him when no one but your brother should be able to being the owner of the Death-note,

So Ryuk would often watch and observe you when you were talking with your brother or even around or just near in the area he'd start watching you till you either left or Light told him too knock it off though of course he never actually told your brother the reasoning for this which confused Light at timed but he usually wouldn't say anything about it

One day your brother Light was sitting in the living room reading a book on the couch while your Parents were out grocery shopping and Ryuk of course being himself was eating a apple across the room