The Marriage Treaty (under heavy editing)

Royalty AU! Tony is the prince of Earth and everything was seemed to be going his way. He had a nice house, people respected and listened to him, and he had amazing friends that didn't judge him. However all of this seemed to fly out the window when he got a letter from pepper saying that Earth had fucked up and almost started a war with Asgard by holding the king's eldest son on Earth against his will and the only way Asgard would put this all behind them was if Tony married the leaders youngest son to rehabilitate him. What will the Prince of Earth do to get out of this one or will he fall so hard he'll lose himself in the act?