User blog comment:Crazylittlefreakgirl/Fairy Tail Official Pairings?/@comment-60.53.103.218-20130507053009

If i'm not mistaken Mashima reinserted Lisanna since she got more fan support than he anticipated. And gets your facts straight Mashima himself wrote on Natsu and Lisanna's relationship. He wanted to show the childhood of the current generation Fairy Tail. The release date of Chapter 55.5 was 2009 and Episode 20 was 2010.