I never really watched the first FMA series and I don't read the manga, but the latest (FMA: Brotherhood is I think the official title) caught my attention
Please read and enjoy at your leisure! Thank you for your time. ^^
Title: Size Matters When He's Prince Charming
Characters: Alphonse Elric, Edward Elric, Winry Rockbell
Pairings: That's what it's all about! >.> So I won't spoil it, but I promise no sex, they're only kids! Ew!
Rating: G/All ages
Summary: Ed and Al (as kids, ages 10 and 9 at the time) each try to woo Winry. This story gives the background of the comment from the series, "You tried to ask out Winry as a kid, but she turned you down because you were shorter than she is!" (Ed to Al, talking about his suit of armor)
Spoilers: That line up there, but it's not much of one. :) Other than that, nope, this is pre-series and purely speculation on my part.
Disclaimer: Square Enix owns Full Metal Alchemist: Brotherhood. I own nothing and have no relation to the company.