I'm looking for any fic where Pepper cheats on Tony, or where Tony or others would consider it a reasonable assumption that she has. If the infidelity is assumed rather than actual, I'd much prefer if Pepper not realize that she's given that impression. The only 'Pepper Cheats" story I could find was one where Tony has a cuccold fetish, which is not what I am looking for.
If none such are available, I'll take anything where the relationship is on the rocks or breaks up and it's Pepper's fault rather than Tony's. (Please do not including the thousand-odd fics where she breaks up with him in order to leave him free for the relationship that's the actual focus of the story.)
Internet fudge brownies if Tony assumes that their issues are his fault, since Pepper's so good with people but Tony isn't, and sucks at relationships. And of course Tony whump is always good.