I’m looking for a fic where an adult Castiel is a new neighbor to the Winchesters (I believe Mary and John are alive). Dean is a little kid and pretty much claims that he and Castiel are some kind of soulmates. I can’t remember if Dean is the alpha or omega, but Dean’s parents and Castiel agree that it’s best if they wait until Dean is of age to start their relationship. Fast forward a few years, Dean finally has his first heat or rut and he and Castiel consummate their relationship.