Secret identity fics

[jmarks15.livejournal.com]

So yes, I did see someone post the same thing just a couple of days ago. But while I know that there are a lot of fics like this based around both of the characters hiding their secret identity, I was wondering if there were any with just one of the characters doing so.
For example....Steve and Tony dating, where Steve is just an ordinary guy, with no superpowers whatsoever, but where Tony is secretly Iron Man, or vice versa (it doesn't have to be Steve/Tony, all pairing are welcome)

I know it's a pretty long shot because I've literally gone through all the tags, but I'm just wondering!