''[[http://archiveofourown.org/works/679146/chapters/1244723 Blood Doesn't Make Family]]'' by [[http://archiveofourown.org/users/musicdefinesusall/pseuds/musicdefinesusall musicdefinesusall]] is a ''Series/{{Supernatural}}'' and ''Franchise/HarryPotter'' CrossOver in which Crowley discovers how the Dursleys are abusing Harry and so adopts him as his own son.

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!!''Blood Doesn't Make Family'' provides examples of:
* AngelsDevilsAndSquid: or angels, demons, and various supernatural things.
* AngryGuardDog: that just happen to be {{Hellhound}}s.
* TheAntichrist: Well, technically, Harry's dad got a promotion at work recently...
* BloodMagic: Crowley uses a blood ritual in order to adopt Harry.
* BreakTheHaughty: [[spoiler:Crowley when he and Harry are under attack by other demons and then he's unexpectedly summoned by the Winchesters.]]
* CanonWelding: ''Harry Potter'' gets melded onto the ''Supernatural'' universe, so now there's a group of natural witches and wizards in Britain that are different from the witches of ''Supernatural'' who make a DealWithTheDevil for their powers.
* TheChessmaster: Crowley.
* CrossOver
* DarkIsNotEvil: Harry and his family. Castiel decides that for demons they're "not so bad."
* DraggedOffToHell: This is the ultimate fate of Vernon and Petunia Dursley.
* DysfunctionJunction: You won't find many happy, well-adjusted people among the cast. Everyone has had abusive families or screwed-up situations.
* EvenEvilHasLovedOnes: [[spoiler:When the Winchesters unexpectedly summon Crowley while he's dealing with some other demons, he is reduced to begging them to save his son.]]
* EvenEvilHasStandards: [[DemonLordsAndArchdevils Crowley]], who condemns souls to Hell for a living, is moved to take action when he overhears what's happening at the Dursleys' house.
* ForWantOfANail: Naturally, Harry is now a Slytherin and Draco is his roommate.
* GrudgingThankYou: Harry insists on thanking the hunters that saved him and his dad, even though they had initially wanted to kill them.
* HalfHumanHybrid: Crowley adopts Harry using a blood ritual that simultaneously binds him to Harry and makes Harry a half-demon.
* HappilyAdopted: Harry with his dad, Crowley, and "Uncle Gabriel."
* {{Hellhound}}: Crowley gets Harry a puppy for his birthday.
* HeroAntagonist: The Winchester Brothers and Albus Dumbledore.
* HiddenInPlainSight: Dumbledore can't find Harry as Harry Potter because he looks a little bit different from the [[BloodMagic blood ritual]] and is attending Hogwarts under his adopted name -- "Harry [=McLeod=]."
* HolyHandGrenade: Gabriel's sword.
* IHaveManyNames: Gabriel, a.k.a. TheTrickster and Loki.
* KickTheSonOfABitch: The wizards find that something happens to the Dursley family... that something being Crowley and his {{Hellhound}}, to be specific.
* OddFriendship: Crowley and Gabriel.
* OverlordJr: Harry reckons he'll go into the family business one day.
* PetTheDog: All of Crowley's interactions with Harry.
* PlayingWithFire: Harry gains this power after the blood ritual.
* SerialKillerKiller: Harry (with help from [[OurAngelsAreDifferent Gabriel]]) practices using his demonic powers on criminals.
* TrademarkFavoriteFood: Gabriel's candy.
* TheTrickster: Gabriel.
* TrainingFromHell: Harry gets this, literally!
* VanHelsingHateCrimes: The Hunters.
* WeaksauceWeakness: Unfortunately, Harry has inherited a demon's allergy to iron.
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