Fics like This Alpha's Army

Lieutenant Castiel Novak is an Omega who has always dreamed of following in his Alpha brother's footsteps by joining a combat unit in the military. Never mind that Omegas aren't allowed into combat. He has worked his entire career for this moment, but it all might come crashing down when he meets his new commanding officer, Captain Dean Winchester. When Cas is sent in for Alpha training as the first Omega in history to do so, he finds himself falling hard for his trainer.

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