Gortash/default!Dark Urge, Bane/Bhaal – first time, dubcon, used as avatars by their gods
Gortash and the Dark Urge have been making alliance overtures for a while, and it’s going extremely well. They’ve heisted together, they’re really impressed by each other; their gods are pleased. It’s time to formally seal the deal! Both Chosen are informed by their masters that this involves some kind of ritual murder (Idk, maybe the Chosen of Bane picks a political target and arranges things so the kill is convenient, while the Chosen of Bhaal does the actual killing). Neither of them gets told about Part 2 of this ritual – their respective deities possess their bodies and proceed to go at it like, uh, blood-smeared rabbits.
-Bonus points if the attraction was already there, but Gortash wasn’t going to risk his most valuable alliance by pursuing it, and the Dark Urge was convinced he’d slaughter Gortash if they fucked.
-Double bonus points for some truly unhinged dirty talk from Bhaal and Bane, using their Chosen's voices.
-Triple bonus points for aftermath where there’s a lot of surprise from Gortash and the Dark Urge, but it’s clear that this hasn’t harmed the closeness of their relationship (maybe they’re closer now).
-I don’t mind at all what the ritual sex consists of! Maybe they fight for dominance, or Gortash/Bane rides the Dark Urge/Bhaal’s cock while making a point that he obeys no one else now, or the Slayer shows up to make things memorable, or the Dark Urge/Bhaal gets put on his hands and knees and referred to as Bane’s war hound while he’s fucked?