Can it be the Terra verse (http://john-n-dean.livejournal.com/28219.html) by john_n_dean? If I recall correctly it's slave!Jensen who is hunted by his family as an unwitting organ donor.

Summary: Futuristic AU in which Jeffery Dean Morgan is a starship captain who saves the life of the president during an interplanetary civil war and gets rewarded with a willful slave named Jensen.