The Funambulist is a story written by Hikaru Yamaguchi. It originally ran in Yes, And 3 at http://s2b2.livejournal.com/312391.html, and is mirrored at http://www.shousetsubangbang.com/mirror/the-funambulist/.
From http://fairyninjas.wordpress.com/2015/07/21/circus-maximus-ssbb-yes-and-3/: "A guy goes to meet up with his friend who works in the circus, and there meets a certain someone…and then again the ….you know, this isn’t one I can describe while being coy. Man. Goes to circus. Lusts after contortionist. Sleeps with contortionist. Returns to circus. Meets a card magician. Lusts after magician. A good read."