"All sparks are beautiful. Yours is no less so." Optimus grinned affectionately, turning Cliffjumper's hand over in his own, pressing a kiss to the more exposed cabling in his wrist without ever glancing away from the exposed spark.

"Especially like this."

Gently, with calculated care, he slipped the barest edge of fingertips inside the bared spark casing. He was just barely tickling the outermost corona of the spark, largely focusing in the inside, circuit-laced curve of Cliffjumper's spark chamber.