Make her finger herself

"Alright" you tell her, "If you want to prove that you'll do anything I tell you, start by playing with yourself."

Without a word, Ashley does as she's told, reaching a hand between her legs and parting her labia with her middle finger. You watch as her finger disappears between her glistening lips, then slides back out, already coated in her juices. She slips a second finger back in with the first and begins working them in and out of her slick hole, moaning as she does so. Enjoying the view, you slowly stroke yourself, watching her body rock in front of you as she begins to pick up her pace. Just as it looks like she may be getting too into it, you order her to stop.

"Now Ashley, only naughty, dirty girls would keep their fingers messy. You have to clean up your mess. Lick them clean like a good little girl."

Obediently, Ashley brings her fingers to her mouth and sucks her juices off each one. "There you go Daddy, all clean." she tells you, popping her fingers free from her mouth. Glancing down to see your hand stroking your dick, she looks back up at you with a grin on her face and asks "Is there anything else you want me to clean up?"