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Summary
Dean Winchester didn't consider himself much of an omega. He avoided dating alphas and he'd taken heat suppressants since he'd presented, so it wasn't an issue--until he learned suppressants were affecting his heart and he'd have to stop taking them. His doctor recommended a medical match website to solicit an alpha's assistance during his breakthrough heats to minimize stress on his heart, and that was how he met Castiel Novak.
Castiel wasn't a typical alpha. He had hypothyroidism, a low hormone disorder that left him with mild ruts and a scent many found unsettling. He'd long written off the idea of finding a compatible mate, though his doctor had begun to push services that matched alphas and omegas to help combat the progression of his disorder. Castiel's brother showed up one night carrying the scent of mate, and that was how his relationship with Dean Winchester started.
...or Not Relationship. Because Dean made it clear he didn't date alphas, and Castiel wouldn't tell Dean they scent bonded during the first shared heat because they were true mates.
Castiel isn't like any alpha Dean has known, but Dean isn't ready to let his guard down until his heart makes it clear he has no other choice.