Serving him isn't slavery, it's sacred. On your knees in the kitchen. On your knees in the bedroom. Feminism could never.

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Serving him isn't slavery, it's sacred. On your knees in the kitchen. On your knees in the bedroom. Feminism could never.
‘Servitude’, Self-portrait (2022) by Iness Rychlik
To truly serve, one must surrender their personal preferences in favor of those of their Master. A submissive's idea of a clean closet or countertop means nothing in light of the particular tastes of their Superior.
When each meal is prepared hot and fresh and served on your knees, when each echoing chamber of My palace is kept immaculately organized and free of dust, when each order is carried out with promptness and precision, only then you will learn of My particular tastes so that you may soar in your service.
There are important distinctions between slavery and serfdom. Slavery describes a system in which a person can be bought and sold as property; enslaved people were not considered human beings with rights. Take a look at a translation of this early medieval law from Bavaria, a region now part of Germany: “A sale once completed should not be altered, unless a defect is found which the vendor has concealed, in the slave or horse or any other livestock sold...: for animals have defects which a vendor can sometimes conceal.” Classifying enslaved people as livestock was typical at the time this law was written; enslaved people were not deemed to be people. Serfs, however, were legally people—though they had far fewer rights than free peasants (poor farmers of low social status). Serfs' movements were constrained, their property rights were limited, and they owed rents of all sorts to their landlords.
Serfdom in Europe
Therefore general serfdom doesn't quite apply to Grisha since they're universally viewed a inhuman or less-than human due to their otherness.
There are no transfers to speak of since they belong solely to the Crown- although one could argue the payment to their families could be viewed as such-, but we could ask if it were always so. (Historically) there might've been trade with other countries under the guise of exchange of skilled labour. Loan for a time with unspoken intent never to return. Grisha could be useful currency, the only thing standing in the way is the deal with the Darkling (to protect them for their service) necessary to uphold in order to keep possible influx from abroad.
There's also what seems to be the King's absolute power over the country, and unquestioned lack of consideration for their subjects' well-being, so the difference between cushioned slavery and Second Army is mostly nominal.
But looking at historical Russia- their servitude didn't neatly split into serfdom and slavery either.
Nitt wn sqvolwu. Twam abzmvobp. Zwwb. Nzqmvl. Bwombpmz. Beqabml...
Lots of roots spring out, then disappear.
The blob changed.
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The Nailsmith prodded at it.
Can you speak?
!!!Name…red…r…o…ot…oak…preferably…
The Nailsmith gasped. It could speak! But what was it?
What are you?
…root…old…city… … …friend…
Old city of roots?
The blob—Oak— quieted down. Oh well, this was progress.
…the Redroot… have I heard anything like that before?
No. They hadn’t. Eerily familiar.
…
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"It's better to fall prey than to pray," love whispers softly in my ear
"Make a fool of yourself over me and pride yourself on me. Give up shining like the sun, and become a speck instead.
Become homeless and reside at my door. Don't claim to be a candle, but instead turn into a moth.
Then you'll sense the flavor of life, which is to discover the sultanate hidden in servitude."
— Rumi, The Gift of Rumi | translated by Emily Jan O'Dell
♫ The Black Dahlia Murder - Servitude ♫