It was such an interesting idea and I really wanted to revisit it!
Basically the dark side loses the war and before the big battle the Malfoys put Draco into a magical dollhouse in order to protect them, presumably with the notion that one of them would be able to come back for him (which doesn't happen for obvious reasons.) The trio are cleaning up the estate and Hermione touches it because she sees Draco as a little doll waving frantically not to touch it.
From then it gets a lot more depressing as they are unable to figure out how to escape, find some comfort in each other, and then proceed to lose their minds completely as the dollhouse slowly turns them into dolls themselves.
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