Natsu! Please remember me!( a Nalu story)

When Lucy finds her self fighting for Natsu's love with her friend Lisanna she totally freaks out. I mean Lisanna is her friend but, has a promise Lisanna want him to keep. She has the total advantage. But, Lucy has been on missions and was there when Lisanna wasn't. Who will win this love battle? Go on read. You know you want to. ( Lisanna is not evil in this one.....)