I figured that the Emperor would suggest a marriage between him and the Mc, especially now that she is free to be wedded. Or maybe with someone from his kingdom since it would enable our Mc to stay in the Empire under his control.
Or after the kidnapping if it is successful, he could try and have her married with a bonding type magic or something close to a curse.
I mean if u want her that badly that's the route I can see working in his favor ╮(￣▽￣)╭
I'm rooting for Green boy to end up with Aristia.
They can even each other out with her gentle nature and his hidden dark one? He seems to really care and even love her and by his actions he would go further and beyond for her. So I hope they end up together(￣∇￣")
I'm thinking that the reason they keep dying is because of her.
Maybe she was an angel in love with Sam and was the one who told on them or even murdered them in the 1st life
And as punishment for killing a fellow angel she would reincarnate as well or she still is an angel and always kill them.
Either way I don't trust her(〜￣△￣)〜
Your theorie is too good. You might be the next Shane Dawson