Sounds like the author of that fic has a hurt/comfort fetish. That's when someone gets off on saving and comforting someone who has gone through something horrible. That's why the story alternates between sweet heartwarming scenes and horrible torture shit. People with this fetish typically get off on being the savior, not the abuser, so there's little chance of them hurting real humans. Regardless, this quote from the author is disturbing:
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What I don't get is how the rest of the smurf community didn't realize this was sexual. I mean, the first page is full of stuff about naked baby ass and fondling smurf tails...