So somehow it lost the artist info when uploading. It's not Usotsukiya, it's from the guest section of the book. And I find it surprising to be signed by Yaburebouki Akuta, all the other pics by him we have are incomparably worse.
This is the best, and only not previously uploaded, page from the whole artbook. Save for 5 pages, it's all bad porn (most of it loli, too). Even setting the porn question aside, I'm surprised anyone would accept such crap as guest content for their publication. I'm guessing it's the Japanese backwards thinking about cooperation again.
Wait...you're referring to Yaburebouki Akuta's guest content as crap or Usotsukiya's main content work as crap? God I got to find scans of that book again to see what you mean.