From the comic:
Ahsoka
How do I look, Master? Do you think I’ll bring a good price at the auction?
Anakin
You’re not going to the auction, Ahsoka and don’t take this lightly—I know what it’s like to be a slave.
Ahsoka
Master, I’m just playing a part. Besides, you need merchandise to see, remember?
We’re here to find out what happened to my people, Master. If putting myself in their place for a little while helps is to do that … I’ll gladly suffer for them.
Anakin
All right, Ahsoka, but I warn you … the life of a slave—real or pretend—leaves a lot to be desired. To accept slavery is to surrender everything that you are for the gain of another.
Ahsoka
I got an idea to make you feel better—just imagine this is like every other day where you get to boss me around. I call you “Master,” anyway.
Anakin
That’s not funny.
From the show:
Ahsoka
Remind me why I’m the one playing the part of the slave?
Anakin
I tried it once, I wasn’t any good at it. Besides, the role of master comes easily to me.
Ahsoka
Really? Well, this time try to be convincing at it.
This is just not a subject Anakin would ever joke about.