I voted for reluctant, but just because it seemed to me something between willing and unwilling.

Of course i play with a willing slave and would not enjoy forcing an unwilling girl into any BDSM or sexual action (wouldn't I?).
But the great thrill is to bring her to do and/or to accept some action or situation she would not have accepted before. ... in my long story with caroline this happened a lot of times ...

For instance giving up the safety word, accepting to be used as a pissoire by me in a first place and by guests later, accepting to be exhibited in various ways .... all in a progressive manner and my satisfaction peaked every time she said: " I don't like to do this, but I believe that, as a slave, I must do it ..."

When she decided to interrupt our relation (after 10 years), she argued that I had done to her the same I do with my horse: if he refuses to jump I shall patiently bring him back and back to the obstacle until he will jump ..... well, she was right and I am proud of this.... but she enjoyed it a lot as well.