Before Sebastian came out of his study room, aurora, actually while she was on the second floor, she came across a large double door room, it was located on the west wing of the mansion, she decided to enter the room as the door itself with how huge it was, attracted her attention, she opened the doors and looked inside.
The room was dark Inside, she couldn't see clearly as the curtains were shut tight, ans there was no source of light inside, thus she moved on her own in the darkness of the room and went to the closest window she saw, she held on to the curtains and pushed them aside.
Then, light rushed in, and brighten up the whole room, the moment light shone inside it, she turned around to see what was inside, and in there, she found out she was in a bedroom...and by how it looks like it, it was master bedroom.