Hey! Would you mind sharing any fics where Tony has to use his looks or charm a bad guy? Thanks a bunch!

The only one I can think of is With Nobody Else But Me by @sineala:
The Avengers need information, and Victor von Doom has it. At a
reception at the Latverian embassy, Tony needs to engage in some
intelligence work and get close to Doom. Very, very close to Doom. He’s
handsome, all right? These things happen. But why does everyone think
Steve would have a problem with this arrangement? They’ve never been
together. It’s not like Steve would ever want Tony.

Jealousy (Just Fuck Me Already) by navaan is a little like that:
Steve asks Tony take him to a party to get him close to a criminal he’s
looking for, and instead he gets to see multiple people hit on Tony.
Tony is having just a little too much fun with that.

@laireshi has some great ones with Tony and Doom where Steve is all jealous, but it isn’t really exactly your ask. If anyone else has other suggestions, please feel free to add them.