I drew this art "imagining" epilogue of Official Novel. This Art is my original, not the scene of official Novel.
Here's my imagination:
Optimus believed that Megatron could be changed. There was only silence between them after the last battle in Chicago, but Megatron already knew about Optimus’s belief.
He went back to the Decepticon base in Africa, and there was nothing but human children. Megatron had thought earthlings are Germs, but he didn't care because he was so tired and exhausted. Megatron flopped down into place where children were playing.
Surprisingly , children weren't scared of Megatron. They approached Megatron closely without fear, and decorated his hand with flowers. Due these children's purity, Megatron started to realize "something" that Optimus really wanted so far. Megatron didn't hurt children, he just gazed at their innocent faces. He stayed motionless and stared at the sunset until children went home in the fullness of time.
It was the last trace he left in earth before he leave to Cybertron.....