Yuuki was just wandering around the Demon Lord’s castle, observing all the fancy and luxurious paintings as she came to discuss something Diavolo...It was all quite extravagant, to be expected of Diavolo’s residence to be honest..

That was until she heard that voice, his voice, that smooth yet formal tone always, Barbatos, in that signature pose, one arm across his waist, the other behind his back..

"Ah, Yuuki, what brings you here? And could I assist you in anyway?"

Barbatos says in a polite and formal tone.