dean/cas AU, nc-17, 3.5k.
cas is a dragon and dean is dragonborn. but that’s basically just the premise and the rest is — you guessed it — porn. warnings for interspecies ~relations, rimming, blood drinking, butt plugs, and very, very slightly possessive behaviour.
When Dean last asked Castiel why he would want to walk past walls celebrating the deaths of dozens of his own kin every day of his life, Castiel answered him with a cryptic tilt of his head, a tiny grimace and the words, “To remember.”