Once again Harry only became Mab’s Vassal in Changes in taking on the Winter Knight Mantle ...
The point is
nothing to do with Harry's "Vassal" relationship (which doesn't exist, pre-Changes where Harry takes the WK Mantle); but with Lea's Vassalage to Mab. It also is about Lea's "Faerie Godmother" relationship to Harry, which transitively becomes Mab's when she puts Lea on ice.
I (
very) strongly suspect that -- if it expires -- Lea's "Faerie Godmother" bargain expired the moment Harry became WK. That was the point Harry became "grown up" from the perspective of governing law. Before that, Lea was fully-obligated (insofar as the bargain held) to "protect" Harry as his FG; and Mab if she acted to prevent Lea.
I also suspect the role of "FG" is substantive & meaningful under Faerie Law... it's possible Margaret didn't have to bargain very hard at all, to get comprehensive and far-reaching protections for Harry, as soon as "FG" was invoked. Indeed, she may have had remarkably LITTLE room on that side of the bargain.
... he was not a vassal and not owed any form of obligation of protection by Mab ...
Harry's vassalage (or rather, as you point out,
lack thereof) was irrelevant to the case.
Lea was
Mab's vassal, and that is the relevant point: when Mab puts Lea on ice, she takes over the
entirety of Lea's obligations.
Lea's Murder Garden -- part of her FG duties -- is still there, in Changes. Lea was still Harry's FG (at least up through the start of the book).
As previously stated, Lea is Harry’s stalker ...
I see very little light between Lea-as-stalker vs. Lea-as-Faerie-Godmother.
This is
Lea we're talking about!
Several of the quotes provided in this thread show both Lea and Mab expressing that the FG obligation still exists; and this is
well into Harry's (mortal-POV) "adult" years.
You aren't providing ANY data to the contrary, only personal-interpretation stuff that is explicitly contradicted by the quotes already provided.