The Dragon Maid manga is indeed still ongoing. It has a dedicated fan base and the creators are committed to bringing more exciting content. However, the release schedule might vary from time to time.
I'm not entirely sure as I haven't read this specific fanfiction. But generally, in 'Miss Kobayashi's Dragon Maid' fanfictions, they often explore different relationships between the characters in new and creative ways. It might involve the dragons and Kobayashi in some unique adventures or emotional developments that deviate from the original story. Since it has'shrink' in the title, perhaps it has something to do with the characters being shrunk and the resulting comical or interesting situations that follow.
One of the main themes is family. The relationship between Kobayashi and Tohru evolves into a family - like bond despite their very different origins. Another theme is acceptance. Kobayashi accepts Tohru in her life with all her dragon - like quirks, and Tohru also tries to fit into the human world which requires a great deal of acceptance of human norms and values.
Well, it could also lead to some comical situations in the fanfic. For example, the dragon might accidentally break things because it's so full and a bit clumsy. Maybe it knocks over furniture or bumps into walls while trying to waddle around. And since dragons are often depicted as powerful and majestic in the original work, this would be a really funny contrast.