It was non-au, Jensen was helping Jared renovate his house, he was painting a wall and slipped and fell down the stairs. After Jensen was signed off from hospital, Jared took him to his house and took care of him. I remember that Jared furnished a room for Jensen specifically, so he could have his own room. I'm pretty sure Jensen was pining.

FOUND
http://aelias-fics.livejournal.com/38974.html