Ascendant Astarion also says he'd go with her to Avernus. You just can't long rest after his encounter with Cazador (and avoid the breakup scene) and have to go straight to the brain. He even drops the L word when Karlach decides to die instead. Nyloth has a video on YT showcasing it if you want to check it out.
That seems remarkably unintuitive (not the avoiding a scene thing but the rest of it). Why in the nine hells would you make a choice that awkward?
