I still don't know why I even wrote this. I've dusted it off and then given up on it like three times. Hopefully it's been worth the effort...
Rating: R (Steve/Tony)
Summary: Antonia Carter Stark takes no shit and no prisoners.
Warnings: Brief mention of torture; brief discussion of intimate partner violence and rape.
Notes: Genderswap! Of the in-this-universe-Tony's-always-been-fema
Here at Dreamwidth or here at AO3.
In some ways, this particular genderswap is canon; Marvel has explicitly mentioned in a relatively recent issue that Reed Richards found an alternate universe where "Natasha" Stark and Steve Rogers married and this somehow averted the Civil War event.