Swordheart (Swordheart, #1)

by T. Kingfisher

“Halla. I need you to do something for me.” “Yes?” “For the next ten minutes, the only words I want you to say are ‘Yes,’ ‘No,’ ‘Harder,’ ‘More,’ and ‘There.’ And if you don’t like what I’m doing, ‘Stop.’ Can you please do that for me?”