Oh and VERY important detail, i really, and i cannot express this enough, REALLY hope that in this Slut NTR ending the antagonists are not around, kinda like a mix of the normal NTR ending where Leto loses the girls, and the Revenge ending where he defeats the bad guys. I just simply don't see how it is possible to create a LOGICAL full blown slut ending for Cyanna if Ulrod is around, as a matter of fact i doubt it can be done for the other 3 heroines as well, but for Cyanna...no shot.
I doubt it would be possible since it is branching off from the normal NTR ending and probably won't have
too many differences (or else it would wind up just becoming a full fourth ending), but reading this reminds me of how much I love the thought of Leto suffering a pyrrhic victory, where he does manage to thwart the Duke's plan and takes down all four antagonists... but for one reason or another, that doesn't stop or undo any of the corruption like it would in the Happy ending. He
technically saves the day, but doesn't manage to save any of the women in his life... and things might even wind up
worse for them specifically because of his actions, where they would all be slightly better off if he had simply twiddled his thumbs and let the bad guys win.
Like to use Cyanna as an example, becoming Ulrod's personal whore in the Normal NTR ending obviously isn't
ideal for her because he's an abusive monster... but by having Ulrod get arrested in the Slut NTR ending, it would leave her in a precarious position where she might be held responsible for some of the things that he did. Either demoted back down to the lowest rank where she starts being harassed by all of the men she used to boss around with no power to actually do anything about it, or if she is thrown out of the guard entirely for her association with Ulrod, that she ends up working at the brothel from Update 13 because her reputation is so ruined by Ulrod's downfall that it's the only place willing to hire her.
tl;dr — the Slut NTR ending is where Leto defeats the villains and then immediately buries his head back into the sand at the first possible opportunity because he assumes everything will automatically go back to normal with them gone, without addressing any of the underlying issues or having difficult conversations.