I would love a line playing a younger male against a powerful older male.
Fantasy setting: A (my character) is a young prince and heir to the throne and an enemy of kingdom of B (your character). B is a king and takes A prisoner looking to break him but notices how the prince looks at him and decides seducing him and claiming him would be much more fun. Not specifically looking for Alpha/Omega but would happily incorporate.
Also would be up for doing this set up in a different setting.