So in the books Jason never took any vamp blood so this is a whole new side plot that we've never seen before.
So, Lafayette says he isn't involved with drainers and he gets the blood consentually from a vamp lover of his, so concievably Jason keeps taking blood from the same vamp.
Taking vamp blood binds the human to a vamp, so who is Jason being bound to? What does this vamp get out of having people bound to him. (Since it makes sense to think Lafayette is dealing vamp blood to others throughout Bon Temps.)