After an invention created by shockwave Turned megatron into a human, he left the Decepticons and was left to fend for himself stuck in the body of a human.

At night you were in your house you saw megatron through your window, he had luscious short grey hair, red eyes, scars on his face and body, as well as a muscular build. He was also unconscious on the street and naked. As you went outside. You took him into your house, clothed him and place him in an empty room with covers. You sat by his side waiting for him to wake up.