Mated to the Dragon Empress

One day you go to earth to handle some business turns into a one night stand that gets you pregnant. Giving birth to twins you know that they won't be safe in your homeland so you take them to their father; he's shocked when he sees you. When you show him the kids and give him a short explanation you have to leave soon after; giving him a bag explaining it will everything he'll need in raising the kids before you leave to go fight the war that rages your homeland.