You were Papyrus babysitter (he's a kid) and Sans would always work a bit late since... You helped Papyrus cook spaghetti and hangout outside with his friends and he would always just hug you and ask for attention... Today Sans decided to stay home while you babysat Papyrus and Papyrus was just being an odd little goof ball...

Sans: "Huh... he's pretty hyper for a lil kid huh..."