Of course he has a pack of Betties. There's also one named Booger. Apparently, the king isn't the only one who's bad at names.

As Sans takes the spool, the Gaster Blaster floating above them blinks as Frisk taps it. It backs away slighty, at first unsure of what the human was doing. But when whatever-they-did apparently turned out to be harmless, it came back, sniffing in earnest down. Sans chuckles as he turns to the sky, watching the kite.

"My magic. I call 'em Gaster Blasters. They're technically attacks, but... eh. They kind of have minds of their own by themselves. Kinda like dogs, honestly."