DemonKing!Dick x Hero!Jason? Say Dick’s been secretly in disguise and has been traveling with Jason since the beginning. At first it was so he could judge whether Jason would need to be “dealt” with, but then he slowly fell in love and kept making excuses to himself to stay. So when they finally reach the Demon Castle throne room Dick reveals who he is and then proposes marriage. He tries to sweeten the deal by offering throne sex and saying as his consort Jason could distract him or advise him.
Jason couldn’t believe this. His dearest companion. The man that had been with him every step of the journey since he’d crossed the border to the kingdom of Gotham. The man he had fallen in love with.
Was the Demon King he had been sent to slay on orders of his god, the great Bat Lord.
“Please, Jason. Rule by my side.”
“How could you lie to me like this? I love you!”
They stood in the throne room. The batwing throne throwing shadows in sharp relief against the stonework.
In all honesty, it was nowhere near as dark and terrifying as Jason had always expected.
“I love you too!” Dick knelt at Jason’s feet, a circlet resting in his hands in offer to the knight. “I never expected to fall in love with you, but I did! How could I tell you who I was? How could I knowing you were sent to kill me?”
It was agony. The deception. The lies.
His whole mission was to -
“End his reign of solitary destruction and terror.” Jason ground out. “That’s what Bruce told me. That’s my mission.”
Dick froze. “I’m sorry, Little Wing. Did you say ‘Bruce’?”
“You don’t get to call me that right now!” The knight hissed.
“No, this is important.” Dick stated, rising. “Bruce? I thought you said your god sent you on the mission. The Bat Lord.”
“Yes.” Jason stated. “Bruce is the Bat Lord. He came to me. Spoke to me himself when he gave me my quest.”
“And what,” Dick ground out, suddenly furious, “was the exact phrasing of that quest?”
Taken aback, Jason recited the words by rote. They were seared into his memory, “Jason, my son, you face a perilous path. You must tame the Nightwing King of Gotham. End his solitary reign of destruction and terror and make Gotham and Parkrow whole again.”
“You! I! Bruce! Argh!” Dick threw his hands up in the air. “I’m going to kill him!” He swooped in and claimed Jason’s mouth in a hungry kiss. The other man couldn’t help but respond, fingers curling in the blue cloak.
When they parted, the Demon King rested their foreheads together. “I am sorry you got dragged into this. I love you. And I’m going to kill my father.”
“What?” The knight was confused. Nothing made sense anymore.
Dick stalked over to a brazier and lit it with a wave of his hand before reaching into a pouch and throwing a handful of glittering powder into the fire.
“Don’t you fucking ignore me, you bastard!”
One did not summon the gods. What the hell was Dick doing?!
The Bat Lord’s face appeared in the fire, the ears of his cowl curling with the path of the flames. If Jason didn’t know any better, he’d say he looked… smug.
“My dearest, eldest son.”
Nightwing was the eldest child of the Dark Knight. Gotham’s chief deity.
“You manipulative pain in the ass!”
“Did you just call me to insult me, Dick?” Bruce drawled, amused. His eyes flicked over to Jason and his expression seemed to shift. “Jason.”
“Stop trying to set me up!”
“Well, as I was successful, I no longer have to.”
“Wait -” Jason squeaked, “What?!”
“Bruce,” Dick explained through clenched teeth, “set us up.”
“I don’t have to kill you?” Jason cautiously asked.
Bruce recoiled as much as an image of fire could, “Of course not.”
“Fuck off. You’re not invited to the wedding.” Dick doused the fire with another wave of his hand.
Jason stared at the empty brazier. “I-I don’t. What.”
The Demon King gently placed the circlet on Jason’s brow. “Marry me.”
What could he do? He loved him. “Dick. You can’t… You can’t keep on the way you have been. No more destruction. No more death.”
“Jason, you’ve already changed me. You make me better.”
“I… okay. I love you.” Dick claimed his mouth in a hungry kiss and snapped his fingers.
Jason found himself straddling his lover on the throne. “That’s -” A moan as dragged from his lips as teeth scraped his throat, “Cheating.”
Mmm. It was good to be the king.