It's hard to know how to tag domination loss here, as demon lord starts out dominant but loses the upper hand for many pages while refusing to admit defeat, but then regains the upper hand and makes him admit defeat... So technically she barely never "lost" her domination. From an appeal perspective I'm tempted to just tag it male:domination loss though, since that's what it ultimately comes down to, this arrogant secret weapon-kun being taken down and brainwashed into a clingy slave. Hmm, yeah, looking at this artist's other works, male:domination loss feels like the right call to me. And the tag description phrase "without the dominant parties regaining control" confirms that female:domination loss wouldn't apply.