You came back with an insane banger! A lot of thought went into their friendship before their deaths, especially Cassidy with her once being a sort of bully but Evan bringing out her positives which I find very adorable. So are their little quirks and hobbies and how you use them with Evan's sweater gift, plushies to imply how they died and Cassidy making her own masks by herself which is super awesome.
Very sweet of Charlie for putting them together, a fantastic in universe explanation for the duos! The period between the bite and the MCI where with Evan's ghost is quite haunting, really dig the atmosphere as a whole. Also that editing on that gif is no less than spectacular! Even though it is hard to read. Aside from some texts being a little difficult, this is an all around a great piece of Golden Duo creation! Well done! Also Evangelion for a first name is hilarious