Kissing, at least - especially by know - was easy, and Cliffjumper felt none of the nervousness over enjoying this like he had with the flickering charge around his spark chamber that almost made him want to open it.

Actually humming quietly into kiss - which was echoed by his engine - Cliffjumper bits his lower lip as Optimus withdrew, both due to the way he'd drawn back, and the following question.

"Uh... Yeah. I mean. Yeah." He'd been looking away at first, then scowled at himself and at the repeat of the confirmation was staring near defiantly into Optimus' optics. Defiance more at his own reactions and nervousness than anything else, though.