Source at https://www.pixiv.net/en/artworks/88614266
This has been TL'd by an anon in the 4chan /trash/ TF threads, and typeset/fucked with by me; you can find that english version at https://e-hentai.org/g/1875567/eefc1da60e/

Artist note:
-「尻尾を出す」って諺がそこはかとなくえっちだなあという気持ちから生まれ出たまんがです。ほんとだよ。うそじゃないよ。

-"It's a comic book that came out of the feeling that the proverb "to show your tail" is somehow a piece of cake. I'm serious. I'm not lying."

(Page 6 was a +20mb jpg at source; had to re-render it as a png since panda's upload limit won't jive with that big a jpg. In case you were wondering.)