although there may be 4,000 words in my 'drafts' folder on AO3 with the tags 'Sharing Body Heat, Canadian Shack, Snowed In, Spirit Animals, Dreams, Hurt/Comfort, Blanket Fic, Soul Bond'
Anyway. I lost any incest squick long ago, and I haven't actually got to the point where Thomas shows up in the books yet anyway, but when I've been in a fandom with a major incest pairing, I usually find that what they're doing isn't what I want out of the pairing, either. (Especially Sam/Dean, there was so much they could have done with incest there and missed it.)
Based on what I've read of Thomas in non-pairing fic, I think I would want either a) your AU where neither of them knows, or b) a story where Thomas has no incest taboo and legitimately doesn't understand Harry's squick, or c) some kind of weird magical situation where incest isn't just normalized, it's mandatory, and Harry accidentally gets used to it.
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although there may be 4,000 words in my 'drafts' folder on AO3 with the tags 'Sharing Body Heat, Canadian Shack, Snowed In, Spirit Animals, Dreams, Hurt/Comfort, Blanket Fic, Soul Bond'Anyway. I lost any incest squick long ago, and I haven't actually got to the point where Thomas shows up in the books yet anyway, but when I've been in a fandom with a major incest pairing, I usually find that what they're doing isn't what I want out of the pairing, either. (Especially Sam/Dean, there was so much they could have done with incest there and missed it.)
Based on what I've read of Thomas in non-pairing fic, I think I would want either a) your AU where neither of them knows, or b) a story where Thomas has no incest taboo and legitimately doesn't understand Harry's squick, or c) some kind of weird magical situation where incest isn't just normalized, it's mandatory, and Harry accidentally gets used to it.