Female DEA agent goes undercover to get at the big players in a drug ring. A local cop plays both sides of the law and makes a bust bringing her in with a bunch of other people. Through his own investigation he discovers she is a DEA agent in deep cover. He brings her into a private interrogation room and threatens to blow her cover, which would actually endanger her life unless she agrees to meet him privately and services his needs. Her own drive to succeed and make the big case influence her decision to go along with him. I am open to work out the details from there.
If interested please PM with your ideas.