"Upstairs we've got a conservatory full of Pokemon they're caring for," Sans explains as he strides out into the pristine hallways, snooping around. "I popped in there the other day to take a look around."

"Downstairs..." He gestures down to the floor with a hand. "...We've got... some kind of evil lab? Not totally clear on that. That's what we're gunna find out. Normally this kind of shit would be the Nightrider's job, but I got you're back, bro."

That's said more ironically than genuinely, because Sans is kind of like that. Can't be too earnest.