I am the one who has you now
I am the one who has you now is a story written by Hyakunichisou 13. It ran in Issue 45 at http://s2b2.livejournal.com/261555.html, and is mirrored at http://www.shousetsubangbang.com/mirror/i-am-the-one-who-has-you-now/.
From fail-fandomanon.dreamwidth.org: "Hipster Cai is in a long term relationship, but he's starting to get itchy feet. He goes to a party where he talks out his problems with a friend and then gets really friendly with a guy called Dan."