Mara and Karandiel didn't have anything specific they wanted to discuss with Ackster. They wanted to congratulate him on his success, pledge their allegiance, promise their loyalty, and profess their admiration and love for him.
It seemed like they had competed about who would confess their impure intentions first. But when Wilma one-upped them with her request, they decided they might not be first, but they at least shouldn't be last. So, they did it together.
However, Ackster couldn't give them an answer.
He had spent the last decade thinking only about saving the world and what he could do to achieve his goals. He had also done everything he thought necessary for that, including making use of Mara and Karandiel and their feelings for him. He had only approached Karandiel when she Fell to use her and her strength.