Kurtbastian Fic, Kurt finds men to have sex with Sebastian

It's been quite a while since I've read this fic, but I've been trying to find it for maybe a year now. Here's what I remember:

-Kurt and Sebastian get engaged, but Kurt's afraid Sebastian is going to cheat
-Kurt finds guys for Sebastian because if Sebastian will cheat, then Kurt can at least let him cheat on his own terms.
-Sebastian thinks Kurt is just kinky, but when he finds out the real reason they have a huge fight
-Sebastian finds a guy for Kurt to have sex with (I think it was Cooper? Or maybe Sam)

This story really pulled at my heartstrings when I first read it, and I wanted to read it one more time. I feel like I've exhausted Ao3 and Tumblr looking for it. Please let me know!