After Harry defeats Voldemort and returns to Hogwarts. He and Ginny are together. A while later they marry and have kids.Luna was crushed by his decision since it was her that had known exactly where Harry stood, being able to see thestrals and all.
Soon she looks Harry up and asks him if he still wants to be friends. Of course Harry being the lovely person that he is says yes. After talkin for a while Harry and Luna realise that they still love each other...or more to say that Harry fugures out that he loves Luna and Luna realizes she still love Harry.
After Luna's visit, Harry and Ginny's relationship gets rocky and they get divorced. Ginny gets the kids and Harry gets Luna. 2 years later they have 3 kids. 1 boy and 2 girls. The girls have Harry's eyes and Luna's voice while the boys are spitting images of Harry with Luna's hair. Their names are James, Lily, and Rose. Their ages are 11, 10 and 13(in order of names). Harry and Luna have a great relationship for the rest of their lives.