There's a side to Megan we have been hint at before; she gets naughty after certain amount of alcohol. It happened with Derek, it happened with Aiden, and Tommy certainly knows about this dirty little side of our favorite Medical Examiner. Fan Fiction Starts with a retrospective on Megan and Tommy's relationship back in the 90's. Might switch to M rated, for future content.
We all have impulses. Sometimes our mind and heart don't agree with each other. Our beloved Dr. Hunt let's her heart pick her actions for once and it leads her to a life-changing consequence.