The Mind let you borrow one of his shirts once just to get you to shut up about how cold it was outside for awhile.
You never gave it back, and everytime you begged the Mind for literally anything afterwards, he always reminded you about that first shirt you needed to return...but you never did, and he never quit.
"Okay, goddammit, fine!" The Mind huffed begrudgingly, making a small mocking noise and rolling his eyes as he shuffled his black jacket off of his shoulders and threw it at your face. "You can borrow another shirt...but don't you forget about the other 13 of those you still owe me back."
...
"...Yes, I've been keeping track." The Mind stated dryly. "This is the last one I'm giving you, I swear. You basically have half of my closet in your closet at this point."