Yeah, it's going to be weird seeing what they do with Tony/Pepper in any theoretical future movies, I think. I'm not sure I'll like it. I think this is possibly that they have a very specific sort of dynamic that is not very like Traditional Romantic Narratives, and I will be horrified and sad if any future movies try to take them and force them into a sort of "this is what romances are supposed to be like" type story?