The two of them are level 5 demon kings and they had to struggle to kill level 4 Celestials in a one-on-one fight. Meanwhile, Aeternus is currently fighting 3 Celestials at the same time after killing 4 other Celestials at once. One of those four Celestials also includes the Celestial Supreme of this plane.
The proof that Aeternus is not what he seems to be is right there in their face but the snake demon king can't see it. It is either due to plain ignorance, pride, or blind confidence. Either way, Aeternus is very weird. This black energy that he produced is very weird.
'I just hope this cooperation will end on a good note. Then maybe I can celebrate by fucking the brains out of this dunce.' She thought to herself. Then she licked her lips while glancing at the snake demon king.
She likes to have sex, she likes to bring powerful individuals to their knees through pleasure, and she also likes violent and strong sexual partners. Aeternus and this snake demon meet all of her criteria for a long session of mind-blowing sex. Unfortunately, Aeternus doesn't seem to have feelings. He is like an emotionless robot. All her flirting and teasing don't get any reaction from him. He is always calm and detached.
She would love to break Aeternus's will through waves upon waves of sexual pleasure. It will fulfill her fantasies and it will also let her crack his secrets. He is sure to spill his deepest darkest secrets when his mind is clouded with unending pleasure. So it is unfortunate that he doesn't reciprocate her charms in any way.
She can try to actively seduce him but it might lead to him taking it as an offense. It has happened before. A succubus queen tried to seduce him and it led to a fight. That succubus queen disappeared since then. She has never been seen after that fight.
Word is that Aeternus has turned her into a chair or something like he always does with his captives. He is notoriously wicked to those who offend him. That's why they call him Reaper. He kills without hesitation at the slightest offense. So she doesn't want to test him. She is still wary of his corrosive energy. Besides, she isn't out of options for someone to have fun with. The snake demon king also meets her criteria. He is strong and he is violent.
Aeternus is not an available option which leaves the snake demon as the next best. She knows that her "feminine charms" are having an effect on him. That's even without her actively trying to charm him. He seems to be angry at her when she flirts but that's good enough for her. Any reaction is good.
He just shows anger because that is the predominant emotion that demons of wrath display. That anger will go nicely with sex. She just has to grind down his resistance.
'He can discharge all his anger on me once I get him in bed. I'll take everything. I am pretty flexible and very accommodating.' She thought to herself in anticipation.
The snake demon king didn't know what she was thinking about. He saw her looking at him weirdly and licking her red lips. That put him on alert immediately. He growled menacingly at her.
"Stop whatever you're planning. I will kill you if you dare."
He doesn't need to think too much to know what she could be thinking about and he doesn't want her to set him as her target. So he tried to threaten her so that she would stay away from him.
His aggressive display didn't deter her at all. It only spurred her on. She purred seductively at him. The snake demon king's eyes narrowed in anger. He felt threatened and when he feels threatened, he attacks.
He did immediately. He shot toward her to strike her. He is not one to be reactive to threats. He likes to be proactive. Demons of lust fight with sex and demons of wrath fight with physical violence. So he intends to fight her now before she uses her charm on him.
Aeternus came out of the cloud at that point. The cloud dispersed behind him. The two of them paused to look at him.
He shook his head and said, "I was only gone for a little while and you're already at each other's throats."
"No, we're not at each other's throats yet. I would like him to get into my throat. I can swallow really well. But he is delaying." The succubus pouted cutely while complaining.
The snake demon king couldn't take it anymore. It moved forward to pounce at her but Aeternus interrupted again. "We are not done yet. Let's get to their divine kingdoms before they get completely destroyed."
The Celestials are dead so their divine kingdoms are defenseless. Their divine kingdom is also where they keep their wealth. They have to get to it before the divine kingdoms are completely destroyed. The divine kingdom will start to fall apart with the death of the gods so they have to rush.
The snake demon king relented. Aeternus makes a good point. The wealth of Celestials is a better alternative than fighting the succubus queen. He looked around and noticed that the defense of the plane was falling apart. The death of the Celestials hit them hard.
The angels of the Celestials died after the death of their creator thereby removing their strongest forces in the angelic host. This allowed the Heralds of the demon kings to rampage across the battlefield without opposition. Even grand gods are not safe from the Heralds.
The snake demon king also noticed the 5 very shiny cores on the ground. Four of them are Celestial Godhoods. The fifth one is the Authority of the Celestial Supreme. The fifth one is the most valuable and also the most dazzling. It is the biggest core on the ground.
The eyes of the snake demon king couldn't help but stare at it with longing. The contract of partnership that they signed couldn't stop him from having some thoughts about Aeternus's loot.