I loved the story! It's a common cliché of "setting your own trap and ending in servitude", but it's well written, well paced and very hot. I think what sold me was the realistic reactions on part 2, you really feel like the shit hit the fan for our intrepid kinkster. So far in part 3 it still doesn't feel "off" in that regard, if realism is your goal here.
I'm enjoying were this is going, as I was afraid it would follow the rules of other such stories with either a good natured, intelligent Dom, or an evil, but stupid Dom. You chose an evil, intelligent Dom, and the dark turn, combined with her reluctant(?) compliance, made my interest spike.
I'm waiting for the next part, whenever that appears, but I would like to make a couple of suggestions:
It would be great not to forgo the self-bondage aspect, as it would be a great way of further ensnaring her into submission, and usually stories like this don't find the sub tying herself after her indenture, which is a shame.
On the other hand, I can't stop feeling that the real hero is Ross, and I would love a happy ending for him, if you get my drift. It's good to be evil, sometimes.