The Ballad of Captains America (http://archiveofourown.org/works/1719986) by JenTheSweetie, 11,183 words. A story where Tony accidentally duplicates all the Avengers. Naturally, a Steve/Steve/Tony threesome ensues. Hilarious and awesome.
No, wait, two fics:
Momentary Paws (http://archiveofourown.org/works/465004) by velithya, 16,834 words. This is the one where Tony becomes a kitten, and you have probably read it, but you should if you haven't.
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The Ballad of Captains America (http://archiveofourown.org/works/1719986) by JenTheSweetie, 11,183 words.
A story where Tony accidentally duplicates all the Avengers. Naturally, a Steve/Steve/Tony threesome ensues. Hilarious and awesome.
No, wait, two fics:
Momentary Paws (http://archiveofourown.org/works/465004) by velithya, 16,834 words.
This is the one where Tony becomes a kitten, and you have probably read it, but you should if you haven't.