You're plannning on staying for a long time, hm? That's rather foolish.

[He turns to face Papyrus fully, giving him a searching up and down look.]

Do you not want to go home? Or is home not truly a home anymore?

[Truthfully, Mirrorton doesn't give a shit. But if he can garner the Real Papyrus's good will, his boisterousness may help him win his own real back to his side.]