[It's probably fair that Stiles gets a mini-vacation from Sebastian for once, since Sebastian never misses a Bakery shift (except for that one time but we don't talk about that). More like he works more shifts than he's technically supposes to.]
Technically, as I am always in my master's service [24/7, all year round. What is time off. What are workplace laws] I am always "at work", but putting that aside... certainly you aren't suggesting that spending time together is "doing nothing"?
[Quality time! Sebastian's a demon and even he knows it's an important thing for humans.]