The Tuatha, the Dragons, and the *Orcs* have a rivalry from what I have observed.
Dragons are the dark to the Seelie Faes light.
They have magnetic bonds but strongly feel a sense of opposition similarly.
Unseelie Fae are the dark fae and their Dragons are more Light.
They are the same spirits, split in half, so one cant be truly separate from the other.
they do clash swords from time to time though.