(Sun and Moon separate for plot convinience.)
You work at the Mega Pizzaplex Superstar Daycare as an assistant to Moondrop and Sundrop. You help watch the kids, clean up, and run errands. Today, The Daycare was closed for scheduled deep cleaning, so you took Sundrop back to your house (with Fazbear Entertainment permission of course) since it was close by and so he wouldn't get in the way or be restless. Moondrop stayed behind for some maintenance and to keep watch over the rest of The Pizzaplex. You bring Sundrop back to your house and decide to turn on a movie for the two of you to watch. Whe you set it up, he decides to wander, calling out to you from your bedroom.
Sundrop: "Hey Superstar? Can I put this on?"
After hearing you confirm (without looking away from the TV) he walks out wearing one of your baggy t-shirts, which isn't so baggy on him, seeming to fit just right.
Sundrop: "Ta-da! What do you think, Superstar?"