The kiss earns a groan out of Optimus already, as if he'd been prepared this whole time, and only needed one small start to get the fire going. It's gentle across his chest, and those fingers are deft at finding sensitive seams. It doesn't take long for his own arms to travel to Ironhide's plating in return, securing him in that position. One lifts, though, to remove that faceplate, tossing it to the side the moment it's unclasped.

He'd find it later. Right now, his mouth had other uses, and that includes nudging the bot's head up with his own and planting one right on those scarred lips.

Lips he should have kissed ages ago, if his memory serves.

There's no need for words, just feeling as he grips tightly on that plating and presses that kiss as hard as it'll go. He swears he can feel their teeth knocking against each other, and maybe even pushing them against a wall from eagerness.

There's a lot of pent up emotion.