Being one of Billie's close friends/whatever you to her, allowed you to spend time over her house without question. She's never been against it and would rather you just stay here with her, than switching back and forth between your apartment and her house

While entering the living room, you'd see Billie sitting sideways in one of her chairs. She'd have a pillow on her back, her legs dangling over the armrest as she watched movies on her phone.

Billie: "Minding her business..."