It starts out as klaine living together in their suburban home in (Ohio? I think). Their lives are nice, and peaceful. Kurt is an interior designer, and Blaine is a music teacher. While their sex lives are not unfulfilling by any means, (I believe it was Blaine's suggestion at first, and Kurt was more that willing to oblige), they seek out another man to enjoy a threesome with. They go to a local gay club, and Kurt sees a guy who he thinks will work, Blaine goes up to the guy Kurt points out with Kurt following shortly behind, when they both realize that the guy is Sebastian. They both agree that Sebastian is a good choice, their past behind them, etc. All three go to their house and have sex and it's amazing and Sebastian is invited to spend the night. Kurt wakes up first and Sebastian is in the kitchen making them coffee/breakfast. Kurt and Sebastian chat until Sebastian has to leave for work. Kurt had just wanted this to be a one time thing, but Blaine feels bad as if they had just used Sebastian and convinces Kurt for them to reach out to him and befriend him. But yeah, basically they eventually meet up again at a gay sports bar, end up having sex again. I think Sebastian gives them his house keys at one point? We also find out that Sebastian is miserable with his life, doesn't have friends, hates his job, and Kurt and Blaine reach out to him even more. That's all I remember from what I read...
I think it's a WIP, but not totally sure.
If anyone knows what I'm talking about here, please tell me! I've been killing myself over this for the past couple days trying to remember, but just can't.