King's Contract

King Igneel has only one choice left when all of his daughter's suitors are married off. King Makarov has two sons but he cannot decide which should be the next heir to the throne. The oldest is prideful brute, while the other is a trickster who spread lies. Whichever one Natsha chooses to marry will become the next King. Fem!Natsu Fem!Natsu&Laxus/Sting