After they broke up, Leah would sometimes sneak into Sam's house and take his things.
Small things. Pencils, rubber bands, lighters, hair ties. Nothing big enough to notice. Just enough to prove to herself that at one time he did belong to her.
That at one time, she owned more than a collection of garbage. That he once gave her his heart in exchange for her own.
The first time she phased, she thought of herself holding his used stationary to her chest. Then she learned that Sam could see into her mind.
He just sighed.
She stopped after that.