Disclaimer: I don't own Naruto, and I earn no money from this
Itachi's Room
No one was allowed in Itachi's room. An invisible line had been drawn around it the day he brought his washing out to her and started answering the door before she knocked. She wasn't even allowed to look into it, he hadn't said as much, but he'd smoothly open the door just enough to slip his slender body through then shut it with a click that seemed to echo.
He started drawing the curtains the same day. He had candles in there, she assumed or oil but he never asked her for either.
He shut himself in and her out.
Shadows
She started to watch him more after that. Itachi was a good shinobi, and good shinobi were good liars. He'd spend hours in there; she'd spend hours in the corridor listening, waiting for something. Sometimes she'd panic after too many hours of silence.
She'd start to walk to his door, he'd move to stand in front of the door and the light that spilled out from his room would die. She'd stay there just a few seconds, hearing his every breath and heartbeat. Then she'd retreat to another room and when she passed the door next the shadow would be gone.