He looked at her with a tilt of his head while she spoke and thought about the mortal beings and all he had ever seen from them was fear, fear of what he was going to do to them and he deserved that for being the monstrosity he was considering he was there to crush their kingdoms and bring their lands to ruin under his rule. He growled in thought and all he wanted was to make his master's happy and to prove he was loyal, he was a powerful demon but in this place his power was weak in this place but the angel caught him off guard when he was still in his weaker forms. "Well I guess they welcome you more willingly but it is easier for that, after all you are there with the Praetors to stop me and my minions from taking their lands."
When she spoke of peace he felt a bit sick in his stomach at that word especially coming from these divine lapdogs, "peace is a fantasy that can never be a reality between the creatures like myself and your kind." He said looking at her with a stern gaze adamant on his point, "the only demons you'd ever be able to co-exist with are those who followed my brother but, they are shunned by us and will never be true demons again." He said with a growl as he finished placing the books on the walls and smirked when she said she might be summoned soon, "oh and what does Desmond need you for, yes I know who the Praetor of Eternity is, maybe another one of my kin is entering the mortal world."
(ya Angels are the warriors of the gods but they are specifically under the command of the most powerful of the Incarnates which is Eternity, and his Praetor is a human named Desmond Aldren who is the one who would summon angels to help him fight.)