Originally this round of growth was just going to be even more hyper cock. But I had so many people ask about or suggest to me that Quentin should grow a bigger ass too that I decided sure, why not. x) It works well enough within the story and adds a little extra interest. It also meant that I had to rework a few pages to (ahem) fit it in. But I think it's actually funnier that way.
It's actually kind of interesting to me how much of this comic has been a collaborative process. As I've mentioned a lot in the past, I have the major story beats planned out and I know generally what's going to happen. But I come up with specific jokes and things as I go along. So if someone (or several someones) suggest the right thing at the right time, it ends up making it into the comic.