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I'm sorry, what? Commentary? Right. I just... Bwuh...
*Erhem* So, anyway, I did the joke that had to happen with Susan and the tea, but the natural follow-up to Diane and Rhoda was Catalina and Susan. I was originally just going to have Susan's transformed form wind up as a taller, black-haired version of Diane's transformed form, but then I decided I wanted to draw her arms a bit thicker. After that, I thought "hey, why not hint at abs?".
Things escalated from there.
Ultimately, I'm really happy with the results. They're, um, good. Very good. In my opinion. I think as far as gratuitous transformations go, this is fitting for Susan. Granted, I'm not sure how likely she'd be to say "who's a good kitty" in actual canon, but hey, she knows this is non-canon.