After Sombra return, he attack Canterlot. To stop the war ponies agree to sign non-aggression pact. But there was a price to that. To seal the deal between the nations, King Sombra will get Ponyville as kingdom of his own, as well as princess Twilight Sparkle to be his wife.
Sex tag is not for a clop story, I just want to be clear that there is some humor like that involve.

This story conect to Mommy Pinkie Pie Diary, but you don't really have to read it to understand it.