This is a fabulous character study of both Millicent and Petunia. The non-linear structure works very well to provide the background of Millicent and Dudley independently of each other and of their relationship, by granting us short glimpses into these character's lives and relationships with other people. I particularly like how fondly Millicent remembers Vince. It paints her as an affectionate person and fleshes him out as a character in his own right. Petunia is very formidable here, she seems to have grown and matured so much since we last encountered her in canon.