"You know-" The demon smiled nervously at the second son and the two priests flanking him "my way seeing of the world- my morality- is not unlike yours. I think we should approach these things with mutual respect-"
"Silence, you insolent oath-breaker." The second son was having none of the demon man-woman-thing's tricks. "You broke our contract."
"Broke? The contract?" The demon laughed politely as they took their handkerchief out to clear some sweat from their brow. "Whatever could you mean?"
The second son took out some glowing parchment. "In return for freeing your uh... siblings? you agreed to sabotage this castle and not aid the royal bloodline of Northchester. And yet, the Northchester Prince has miraculously evaded capture. Summoned allies. Then they together are preparing to march against us."
The second made a signal to the two priests as he continued. "Our seers have confirmed our suspicion. You are a traitor. And even your kin now run free, your life will serve as a default."
The priests wielded their holy implements. There was nowhere to run in the small room.
"No third parties shall mediate the Contract." With the demon's command, shimmering shadows leapt from the parchment unto the two priests. They both froze, as if stuck in time. The second son gulped.
The demon grinned, this time toothily, "Too bad- the contract has been unbroken and it's magic is quite alive. Well, until you broke it just now with your little assault on my life. Heh."
Realization set over the second son. The first son was far away- he must have known something was off.
The demon laughed, haughtily and fully, "Let me spell it out for you. There is no bloodline Prince of Northchester- both because she's an adopted orphan and she's a princess. And barely a princess at that- she's more interested in returning the land to its people and their ancient ways~" the demon tucked their handkerchief into their chest, "I happen to be quite fond of her. My protection of her has been irrelevant to the contract."
"Anyway- since you so rudely broke our agreement- I'll have to exact penalty-" The demon declared. With a snap of their finger, the contract glowed, and something ethereal yet important was removed from the second son.
"Let me repeat myself-" the demon continued, "I'm quite the agreeable person- if you and your cunning siblings were content to chop up and backstab other church nobles, I wouldn't care less. But seize and strengthen the colony in Northchester? And then you threaten my siblings to force me to help you?" The demon spat on the carpet "Well, lets say I don't have many polite words for you."
The demon looked at the ghostly thing yanked from within the second son. "Well, allow me write your destiny for you. You forget our meeting this day. Your more clever siblings abandon you here. You rule here as an unpopular despot for a month at most. You die- swiftly and pathetically- at the hands of the Northchester people."
The immaterial something moved back into the second son, and he immediately passed out. When he came to, neither him nor the priests were sure what they doing in this room to begin with.