Not
yet.
There's an "optional" way, more like being owned.
Complete the part of the "Search for Arthur" at Zaranix house (basically, get in -in good terms-, "rescue" Arthur, and get out), and you can return whenever you want. Get inside, and roam around to find Amber and submit to her.
You'll get collared like slaves, but the collar it's an unique, unremovable item (you can easily unjinx, and remove/re-enchant at leisure) to mark you as "hers".
After that, you can visit Amber as much as you want, and get a variety of scenes, which depends on her mood, time and weather.
And who would be the "main antagonist"?
Whoever teleported you to the mirror (at the beginning) could have had killed you instead, so he/she doesn't wants you dead.
If you get enslaved by Enforcers, you don't get killed.
You could also become a willing slave (like Rose), which clearly won't kill you either.
AGES ago, Inno said that becoming enslaved was planned, she said something like "in the next zone", whatever that means (this was before Amber was released I think... so maybe that's what she meant with "being enslaved")
I don't think it's something to happen in the next versions, but it's definitely planned.