Doul is very reasonable when it comes to matters of payment; so long as he's able to save for the things Nuala wants and he can keep himself fed, housed, and well provisioned, there's little else that he wants.

"I would also like the chance to practice outside, with the others, if that's agreeable?" It wouldn't do to let his skills get too rusty by spending all his time buried in stacks of books, scrolls, and curious tomes.

It's also worth mentioning that his voice is probably unlike Pullo's in that it's constantly being described by his original author as being ridiculously beautiful. No, really.