Optimus shuddered at the contact, armor tensing before he eased out against Cliffjumper, strutless and rumbling. Smart little mech, going right for the sensitive spot.

"Hnn... Oh yes." He chuckled shakily, tone approving. He angled his helm to give Cliffjumper easier access to the antennae, lips sliding further down the minibot's jawline. "Those are- rather sensitive. Feels good."

Still purring, he slid a leg down Cliffjumper's frame, rubbing shin armor in a slow, repetitive motion, encouraging and calming. He wanted to get the little mech used to his touch before trying what he just did. Touching the minibot's horns was bound to get far more of a reaction, and he wanted it to be purely positive.