alpha arthur pendragon (merlin)

Merlin, Arthur and the knights are kidnapped by hunters whilst on a trip. Upon drugging Merlin and finding out about his secret omega status and magic, the leader of the group finds joy in taunting the others (mostly Arthur) with a drugged and submissive warlock. But dealing with the fallout reveals a lot more than just Merlin’s secrets. - "Merlin!” “I'm sorry.” He muttered, through the pain. "What? Why, why are you sorry? Merlin!?" He then smelt it, Omegan heat, and it smelt amazing, it smelt like home, it smelt like... Oh. Oh, gods, Merlin was an Omega.

Merlin was sharpening one of Arthur's swords out on the training field when a new alpha knight decides to try and boss him around and then try to teach him some manner. This does not sit well with Arthur.