They end up being married after all this time waiting because Lucy loves him too much to deny him even if she might not feel the same way back then. They have a son together named Harry Potter (maybe not exactly what you would expect from a fairy tale story). Natsu has learned to control his powers through his interaction with Lucy and others, so he is able to fight during the final battle against Hades without hurting anyone. After defeating him, Natsu realizes that keeping secrets from someone you love is a bad idea so he tells Lucy about his past as a dragon rider.