Assuming she wasn't vaporized, I'm not entirely sure what I COULD do. I mean, he's a physical god. What are you going to do, break your hand at him? I suppose I'd sort of passive-aggressively imply he's a dick, if I could without weeping at his beauty and falling on my face in awe.
If the Emperor wants to fuck your girlfriend, there isn't terribly much you can DO about it.