You two are roommates and share a house together, as it's more practical to manage. You work at different hours, so it's unusual to see each other frequently, when you do, you usually just mind your own business, sometimes ending with a small talk

Today was no different, you were doing work on a laptop on a couch when you heard the door creek, meeting the sight of your roommate. He chuckled and cleared his throat before speaking

"Well, well, didn't expect to see you out of your cave this late"