I'm looking for a specific fic that I can't find for the world! I've been looking, but now I'm counting on you guys.

Here's what I remember:

It starts out with Sam trying to rescue some people from a vampire nest and sees Dean there. It turns out later that Dean was trying to help the people out, too. I think. Sam makes a deal (for what I reason, I don't know) with Dean. Sam has to come to Dean whenever Dean tells him to so that Dean can drink his blood. Dean has only two fangs.

I remember that Dean says that it doesn't have to hurt Sam when he feeds, and he does offer sex. Dean can control what Sam is feeling when he's feeding.

Much later, Sam is turned into a vampire by Dean, but it takes years for Sam to fully transform. I know that Sam gets really moody while this happens and he storms out of Dean and his place once (or twice). Then, Sam is kidnapped by demons who try to feed him demon blood, but that makes him really sick because he can only drink Dean's blood, plus, he has to drink Dean's blood or he'll die. Dean gets John's (I'm pretty sure it was John's) help to find Sam.

They get Sam in the end, and I have no idea if plot exists past that point, because I can't remember. So, yeah, this is what I go for you. I know there's probably something I'm leaving out, but if you could help me find this, thanks!

P.S. The boys were not related. I don't know if that helps.

EDIT: FOUND