Clearly, the lot of you _haven't_ read The Collar...
This is not a scene. It's not play, it's not ritualized.
It's legal slavery. The slave is not voluntarily such. It's just like the slavery in the US prior to the Civil War, and in England prior to it being outlawed, etc., etc. etc.
Thus, BDSM doesn't enter the situation, at all. That's why he doesn't want stories dealing with heavy BDSM; it's not that version of slavery.
(This doesn't mean that there aren't those who wouldn't abuse the legal situation in an involuntary pseudo-BDSM type of thing, but without all involved being voluntarily part of it, it doesn't classify as BDSM in my book, but just outright criminal sadistic treatment on the part of the _legal_ owner of _legal_ property; while the owner is getting jollies from it, the slave _isn't_; it's not reciprocal, it's not a mutually supportive relationship.)
Yes, D/S is part of it, but only in that the legal situation mandates that the slave submits to the orders of the owner, and she (the slave) is very much aware of this.
That said... check out a series of stories by Tedbiker, Devastation Diaries. These are also set in an England where things have drastically changed, in this case after a devastating world war, and legal indentured servitude (in theory, not slavery, in practice, yes, slavery) has been re-instituted. And, as with Old Softy, Tedbiker writes very compassionate stories.
Tedbiker does have a couple of other stories which involve slavery of the BDSM definition, but they, too, have much more of the feel of The Collar than those suggested previously. I would unhesitatingly recommend them as well.