Creatures

Harry one day finds out about his Creature Inheritance and comes to know that one of his mate is someone on who he has a crush on but.....it's truly unexpected.
The second is a mate who is a stranger, nor Harry nor Severus knows who he is.
A war is comming. There will be bloodshed, deaths, people will loose their families and friends.
The three mates must protect each other and others. Or the world will end.