I can tell you how it will happen. Sookie will be SUPER nervous about telling him, then she'll finally just get up the nerve because he keeps mentioning how Debi just "disapeared" (of course it will have been Eric and/or Bill who helped her cover the whole thing up) and she will break down and tell him and do her normal "I'm sooooo sorry. " and he will be mad for a whole 2 seconds and her tears will get to him and she'll me like "I love you" and he'll be all I love you too" and they "won't be able to fight it anymore" and they'll do the nastey right then and there and the next time they show them they'll be naked in bed.