Starting at the end of the third movie. This is an Alternate ending to the movie and a new beginning for Megatron. What happens when Megatron stops fighting, What will Optimus do? Major spoilers right off the bat. Megatron/Optimus bonding. Very mild Sam/Bee on the side.

Megatron angers one God too many and Primus finally deems it time he and his Decepticon followers learnt a cruel lesson. But will they change after seeing life through the eyes of the humans in one of the poorest places on the planet. Eventual Slash.