I'm pretty sure I didn't imagine this story, though I won't rule it out completely:
Jared is a tattoo artist and runs his own shop, Jensen might be too I think but I'm not entirely certain on that one. I don't remember much about the story aside from a specific scene where Jared falls asleep in his office or the back of the shop or something, and Jensen goes in and sort of nudges him awake even though I'm fairly sure the other workers at the shop warn him not to catch Jared off guard. When Jared wakes up, he ends up pinning Jensen to the wall like he'd fending off an attacker or something until he realises who it is and its like OMG I'm so sorry, I didn't mean to jump you like that. It turns out Jared was attacked a few years ago or abused or something that makes him startle really easy and go into instant fight mode. That's all I remember, Jensen might have been a new piercer guy at the shop...possibly. But I might be mixing it up with another story. Does anyone know what I'm on about here? Or have I just lost the plot?