AU: The New Order planned to brainwash Poe into serving them. Their first step was to give him a drug/implant that would make him implicitly trust a specially assigned officer. But Finn's rescue interfered with the plan. Instead Poe 'imprinted' on Finn.

Sometime after they find out about the drug and both Poe and Finn freak out because were Poe's feelings solely drug induced?
How it ends is up to you.