This one was made by aoiuchuu, who also made a whole series of Fox x Falco pics with a cute, bishonen streak to them. You can find them here: https://e621.net/post/index/1/aoiuchuu
(The third one from the left in the last row isn't by them, by the way).
They completely disappeared off the face of the Internet after deactivating their tumblr, sadly.
Edited at 27/3/2017(Mon)04:48:56