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Castiel ought to have been prepared for this: for the sight of Dean in the flush of his first heat, aroused and potent and so very possible. But he’d never expected for it to happen so far from home. This part of the business – Dean aroused but ignorant, uncertain, the transition from child to a confident desiring adult, who would look on Castiel and grin that grin of his but with something new and knowing behind it, who would reach for him with desire – this was always meant to be Gabriel’s. It was the alpha who had to forge that creature out of this molten mass.
- Part 1 of Angel flock 'verse