maybe nothing will happen, in fact Nagi might actually like Mashiro because she stand up to him and since Mashiro is kinda of like his equal, he'll probably not be as piss as if a lowly hime did it to him. I think we may see some fake BL as Nagi trying to pursue Mashiro for many many laugh haha, after all if Nagi found out he his going to marry some guys....I can see nuclear winter coming soon if they have nuclear weapons.