Not sure if this is the one you mean, but it's the first I thought of. If not, I'm keen to read the one you're looking for too :)
Win Win Situation (http://mediaville.livejournal.com/50836.html) - by mediaville (11K, NC17) Summary:The (plot device) made us do it! The boys have to make out on camera. Also available as a podfic (http://audio-by-juice.livejournal.com/21388.html)
There's also Premium Cable (http://archiveofourown.org/works/331504) by bewaretheides15: "It isn’t the fact that Jensen’s a guy that’s really bugging Jared at the moment. It’s more that he’s pretty sure Eric Kripke secretly wants to be making gay porn."
And Chemistry (http://glovered.livejournal.com/114834.html) by glovered: "Jensen reminds himself that there's absolutely nothing wrong with a platonic jerk-off scene between brothers. And there’s nothing platonic about his feelings for Jared."
no subject
Date: 2016-10-17 03:03 am (UTC)Win Win Situation (http://mediaville.livejournal.com/50836.html) - by
Summary: The (plot device) made us do it! The boys have to make out on camera.
Also available as a podfic (http://audio-by-juice.livejournal.com/21388.html)
no subject
Date: 2016-10-21 01:10 am (UTC)And Chemistry (http://glovered.livejournal.com/114834.html) by glovered: "Jensen reminds himself that there's absolutely nothing wrong with a platonic jerk-off scene between brothers. And there’s nothing platonic about his feelings for Jared."