Was thinking for a while now about writing an AU (I realy dont have the time so, instead, I am offering my AU idea to you) ala Krypton never died AU where Kal gets send to earth as an adult to lead the forces and invade it. Krypton thinks that it will surely be easy. Humans arent as far evolved as kryptonians when it comes to technology AND life under the light of a yellow star. Easy pickings.
Turns out it isnt. Instead of an easy win krypton has unwittingly put itself into a year long stalemate war.But Krypton has nothing if not time and recources so, eventually, they get humanity on the backfoot.Entrance, Lex Luthor with the potentially dumbest idea in his career as a rebell leader.Can you guess it? Exactly. Seducing the General. (Definitely no personal reasons. Nu-uh. Only selfless saving the earth on Lexs side)
With your ideas of kryptonian culture Lexs thought process gets a little more logical. With the mating for life and extreme feral protectiveness of their mates and hatchlings (Could also be Lex making Connor as a political pawn and then not only falling in love with the child but also getting told 'Youre the generals mate now. The nest is that way'. Would be funny.)
The UNO Reverse twist is absolutely amazing! It would definitely be the start of some weird Human/Kryptonian "truce" that the Kryptonians are extremely on the fence about. Some just accept it, others try to challenge the decision and have their asses handed to them.
And Lex trying to baby trap Clark just to be Shotgun Wedding'd and ending up actually loving his own son is *Chef's Kiss*, perfect!
