[She's being lighthearted about it, but wow, even the pretend idea of Papyrus being married is still really weird to him. Hopefully if it ever happens for real Sans has more time to prepare for it.

Sans picks up a piece of sandwich loaf, more to examine it than anything else, as he considers.] Maybe it's like a really pushy way to populate this place. Can't have people say no to movin' in if you don't give 'em a chance to.

[That seems really dumb, but maybe his real point is that this whole thing seems really dumb to him, so why not a dumb motive, too?]