I've just received my scans of Nanao's K-ON! doujin, of the Book of Mio/Mio no Hon series. The only scan of this doujin previously was a really low quality one, so I am glad I can now upload a much higher quality scan. I am going to try and get this commissioned for a translation soon.
I forgot to add it to my comment, but this is the 2nd part of this series https://e-hentai.org/g/2856457/e87f5798c6/. I am going to try get the first chapter scanned eventually, since that's not really available anywhere yet. (Btw, I got this doujin from buydoujinshi.com)