The shy succubus

The shy succubus seemed the most un-succubus-like of the options, maybe she'd be the easiest to turn things around on. So Kasha turned to her and said, "I choose this one."

The burly succubus grunted in frustration, while the feminine one sighed with disappointment.

"And which shall you choose?" Miss French asked the burly one, who immediately chose the feminine succubus.

"Alright, now that you've paired off, let me explain the rules. Your goal is simple, bring your opponent to orgasm using only kissing. To be clear, kissing involves more than the mouth and lips. You may target anything above the shoulders, including the neck, the cheek, and the ears. You may also experiment a bit with licking, blowing, and other tactics. A magic barrier shall numb you below the shoulders, so doing anything below that will be pointless. Now, you may begin!"

The other two succubi immediately pounced on each other, but Kasha was left staring down the shy succubus. Should she make the first move? Or see if the shy succubus could gather her courage?