Ascended Astarion has this line I've seen where he says something like "you'll sit nicely in my lap, perhaps naked, while I give orders". I can't stop thinking of a Durge Tav reversing that back on him after taking over the Netherbrain or something. Basically they force Astarion (don't care if he's actually ascended or not) to sit naked in their lap while talking to some non-mind controlled delegation or something, and forces him to orgasm while doing so. Astarion should be completely humiliated.

+Durge is physically larger than Astarion, gender doesn't matter but would prefer human bodied Tav
++Astarion isn't mind controlled but just physically dominated by Durge
+++Durge is not even really paying attention to Astarion as they do it
++++The other companions are there to witness the humiliation