Into a regular tiger or a sabertooth tiger? 'Cause the only thing I can think of is Crossfire (http://archiveofourown.org/works/540911) which is an Ironman Noir story where Steve is turned into a sabertooth... and there's no Loki.
I think it might've been a bengal or white tiger. I remember it was definitely Loki who did it because Steve pounced on him at the end to get him to turn him back.
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Date: 2015-02-10 03:55 am (UTC)no subject
Date: 2015-02-10 06:26 am (UTC)no subject
Date: 2016-06-05 03:54 am (UTC)https://www.fanfiction.net/s/7616876/1/Pretty-Pretty-Kitty