>>280029554
>Tawawa author is a huge Sakurafag
Checks out. Looks like he even did a little something for Nanoha.
https://exhentai.org/g/49242/a3f5395205/

What I failed to mention in the OP, and why I think exploring this is so important, is that doujin spirit is also about inspiration.
Circles and artists all echo off each other and bring about the creation of something that might turn out to be your favorite thing ever, which in turn might inspire you to make something.
It's a beautiful cycle.