Little Deceiver

Sam and Miles once had a friend by the name of Emily, but after many lies and rumors, they left their friend behind. when Miles is now left behind, Emily offers him a helping hand as well as joining a group.
The Decepticons.
Without telling anyone who they work for, Miles and Emily watch, listen and give information without Sam nor the Autobots knowing who the Whistle Blower to their war is.
But when Emily starts to see the agreement she made with Megatron not working out and starting to get betrayed again, will she join the side Sam is on even though they don't get along anymore? and will Miles follow her or hold a grudge without thinking?

Warnings: Past Occurrences, trigger warnings, poly relationships, violence, smut...