merMay (31 day prompt challenge)

When Ferb gains some... additions to his body in the middle of their first project of their summer, he ends up requiring the help of a woman he hasn't seen since he was a baby. And that's not the only change going on in the Flynn-Fletcher household. Five years later, when Ferb returns to Danville, he finds the city and the people a little different, but there are some similarities.