If this is in the Lighter Chains universe, it makes me wonder what she did to deserve such robust restraints. Very heavy duty, enchanted, and in multiple places!
First, she's stunning, love the tats. My own imagination? She's actually a powerful magic user in her own right, those manacles with the runes are to keep in her check ;-)
Madeline, seems to have made several rather good points. Thick runed manacles in this universe (where lighter chains are given to more willing submissives and slaves) seem to say that only is she a powerful magic user in her own right but, as one would not exactly be "reduced" or subdued into submission/slavery. Though the wrist manacles seem to be missing.
Now, given the nature of her restraints, she'd almost have to be a seriously powerful mage from a country - or perhaps even a parallel universe - that Mistress' leaders are having considerable trouble with. Since Allison had no real idea what Mistress' people are, they must be fairly new in his world. I do recall that, in the first series, he said that the demons had been on Earth for a few centuries. But he was considerably surprised by the demons apparent relatively normal appearance. The two datums seem to conflict, but I'm sure that The Author could explain, if he/she choose to.
Methinks the reason why there are no wrist restraints is because they want her to fight back against her conditioning in order to give them justification to double-down on said conditioning and ramp-up its intensity
