[Astarion hadn't expected that Gale would so immediately reject the idea. He thought Gale would understand the offer, a chance for more power if the crown was denied to him. It sits ill at ease with him, but he presses more, half to convince himself that it's the right path to take.]

You wouldn't need to be a spawn. I could make you a full vampire under me. And we could utilize your thoughts on protecting yourself from the sun. You would have all that power alongside your natural talents with the Weave.