Demonstration

"Anna," I said. "Why don't you show us how you would suck a dick by sucking your thumb."

"Good idea," said Anna. She pulled her toes out of her mouth and began to suck her thumb in a sexual, sensual manner.

"Moan," said Rachel.

"Mmmm," moaned Anna onto her thumb. "Mmmmm. Mmmmmmmm."

Anna seemed quite adept at dick sucking.