Of course he's wanted. Optimus Prime is the greatest good anyone could ever hope to meet, let alone touch. Or... kiss. As the case currently may be. Feeling him this way, knowing he approves of this, wants this, is like some kind of religious experience.

Not that he's going to be reserved about it. Not at all. His engine revs sharply, low and hard enough to shake the ground they stand on. He matches Prime, kiss for kiss, scraping teeth over lips. If Prime wants it, then, damn it, he's going to give his all.

He's not the best at this. His movements are rough, a little jerky, out of practice. But his hands run along Prime's body, eager to learn, and prove himself.