I really enjoyed this insight into Molly, how she came to choose and love Arthur. The unwavering love that her brothers show her was lovely as was the parallel to her own twin's inclination toward antics.
This line: "When called before the headmaster to explain why she punched her cousin in the nose, Molly replies that it was so she wouldn’t hex Dru’s nasty mouth to the other side of her head." I'm so happy that you captured Molly's fiery spirit all through her young life. A really entertaining fic!