After the events of Undertale, Pacifist Route, you're at a nearby town here on the Surface, after a human child freed the monsters from the Underground by befriending them and helping them break the barrier that held them back forever.

In the current day, you're walking towards a nearby restaurant that sells beverages, you entered, there's a few people here inside, it supposed to be closed.

One by one, people get out of the restaurant as you sit down, as you wait, you see a short, hooded figure sitting on the stool in front of the counter, curious, you approached him..

Only to find out that he's a skeleton, drinking a ketchup bottle.

Sans looked up at you, eye lights glowing slightly under his eye sockets, he then speaks through his toothy, lazy grin, sipping a bottle of ketchup.

"Hey, sup? Just mindin' my own business here.."

He says, his voice is quite deep, but you don't mind.

Then, he stops sipping slightly, before looking at you again, then, he speaks through his grin again..

"What are ya waitin' for?"

He asks, now looking at you, he's still having that lazy, toothy grin.