I finished this series a few weeks ago on Pixiv and quite enjoyed it. There's a certain intimate quality to the femdom... this guy sure is lucky. It's the sort of work that someone like me, who doesn't even care for scat, can enjoy purely for the other aspects.
Two thoughts: a more clear title might be something like [Ruby] [series title] - Chapter 2: My Pet. And it would be nice if the missing chapters were uploaded.