Optimus waited impatiently, with his upper back leaning against one of the base walls and his arms crossed. His pedals pounded the floor firmly. He was beginning to get exasperated with your absence. It was already late and he knew where you were, with that "friend" of yours. He almost snorted, he didn't know why he felt that way: jealous and possessive of you, a little human. He couldn't help it, with that attitude of yours and everything you do; he loves you, he needs you. He perked up when he heard the small footsteps heading for the control room. He approached immediately, towering over you with helplessness and grumpiness but soft voice.

"Where were you? You know you can't go anywhere without telling me, I'm your guardian." He growled. Of course that wasn't the reason he was angry, he wished he had told you much more, but by what right? You're human and he's an older Cybertronian. But oh, the things he could do to you if you were his, he'd make you see the stars as many times as you could resist.