Best Friends Brother(Brennan Donnelly

This is about how the Donnelly's have been family friends for ever and Katie is your best friend and how as you grow older you start to see her brother Brennan as something more than Katie's brother or as you say your "brother".This is not a "Brannie" fanfic this may upset some people but I decided that I didn't want to make one about that they are both happy being separate and not being shipped so I decided to make this because there are not many stories about just Brennan so I wanted to make one.I hope you guys enjoy this.