Optimus Prime was standing on the grass looking at the road from afar, he went to visit you without prior notice, he simply cared about you although he flatly denied it, he had to protect you, he met you when he come to the Earth, you treated him kind and modified him to feel feelings, he just became attached to you. "Ugh.. sigh I don't promise I won't be stable without you." Optimus Prime said as he sat looking at you, when you approached, he pullud you and sat next to you.