Letting out a low grunt of pleasure, Optimus moved to do follow those rough directions. Hand skimming across the rough edges on the side, he tentatively traced the base of her nearest audial spine, both nervous and excited at once. Kisses slowing as he slid anxious fingers up the length of it, he waited for a reaction of any sort, good or bad.

Her touch across his helm vent drew a choked gasp from him, breaking off the kiss completely as he shuddered.