HAH!!! I FOUND IT!!! It's a kink meme fill, which was why it was such a bitch to track down.
Running Into Fate (http://spnkink-meme.livejournal.com/69733.html?thread=23137637&%20#t23137637) by Anonymous.
"Jared has just graduated high school, but his mother insists he has to go to omega school to learn to be a 'proper' omega, and be assigned an alpha. Not knowing how to get out of it, Jared drives away and after running out of gas, goes into the woods, where he is suddenly tackled and violently knotted by an alpha in heat.
Jensen has been trying to find his mate for years in his town's run of the omegas, where willing omegas choose their alphas, but he's had no luck so far. The last thing he remembers is the intense lust-haze the omegas' scent set off in him, and now his mind has cleared and he's horrified to see what he has done to the young crying omega still bound to him..."
no subject
Date: 2016-03-28 08:30 am (UTC)Running Into Fate (http://spnkink-meme.livejournal.com/69733.html?thread=23137637&%20#t23137637) by Anonymous.
"Jared has just graduated high school, but his mother insists he has to go to omega school to learn to be a 'proper' omega, and be assigned an alpha. Not knowing how to get out of it, Jared drives away and after running out of gas, goes into the woods, where he is suddenly tackled and violently knotted by an alpha in heat.
Jensen has been trying to find his mate for years in his town's run of the omegas, where willing omegas choose their alphas, but he's had no luck so far. The last thing he remembers is the intense lust-haze the omegas' scent set off in him, and now his mind has cleared and he's horrified to see what he has done to the young crying omega still bound to him..."