Ok this is going to be so incredibly vague I can only hope someone will know what I'm talking about.
There was a WIP I read a while back. There was bdsm though for the life of me I can't remember what kind. Jared was sub Jensen was dom, Tom Welling used to have a thing with Jared, just once though and it didn't end as he hoped and now he's kinda jealous of them, when Jensen brags about what a good sub Jared is. The last part I read was Tom going to some BDSM club and a woman there trying to ... make him be her sub? yeah, something like that.
Alas, that's all I remember, sorry... can anyone help?
ETA: You found it for me! :) Thank you all :)