It would help if you could include the name of your story and the archive in which it is published to speed up locating your story.
For future reference, our FAQ on disclaimers does contain examples, including a fairly simple example of a fan fiction disclaimer. We do appreciate a bit of creativity, actually, but there are certain things that must be stated in order to stay in compliance with the copyright laws here in the US. It must state that you do not own the fandom, by name, which for you is Captain America. It must say that you make no money or that you make no profit.
As long as those things are there and unmistakable, I myself enjoy a bit of humor or creativity. It brightens my day immensely, especially when I've had to review over a hundred stories that day for ToS compliance. I will say that we have very clearly defined criteria for leaving a warning on a story about any ToS issue, and everything we moderators do is submitted for review to the administrators, so it's not a case of our being arbitrary. Even the warnings we leave are standardized and written by the administrators. No one is treated differently that way.
As an author, I'm required to observe the exact same rules on this site, and I'd get warned just as quickly and in the exact same manner. In fact, I'd probably get warned faster, since my fellow moderators and the administrators all know a dozen ways to poke me. It's not meant to be punitive, or difficult. It's simply what needs to be done to make sure that fan fiction can continue to be written and published for everyone to enjoy.