Renaxan
So let's see The devils attacked the fallen angels leader's children And the fallen angels leader didn't demand anything for their stright to face breaking to the treaty? You know the satans would have executed Riser for betrayal because what the phenex house did, right? What you wrote is totally illogical.
We are already thought about this, Azazel certainly will ask more phenex tears supply and stuff that I will plan to reveal later. Asking to engaged both of them also part of detail, and thats also reason why Lord Phenex didn't ask "what benefit on us if we agree your request?" since he know he actually in disadvantage. He even said at the end of chapter, hope cooperation between fallen angel and his family to mend the problem between them. From previous chapter Azazel already said his faction would raid their manor directly on underworld because what Riser did after all. Azazel know, politically they are already winning, but since he will ask to engaged both of their children here, he wouldn't want to make their new allies on much disadvantage.
And even if Riser was killed The Phenex house won't even dare to say anything Let's be honest Would they say we shall declare war on the fallen angels because they killed our son when he was attacking the son of their leader? That is asking for execution They were never in a place to negotiate with Azazel