Bring some truth to the situation

"You're learning," you tell her, seeing her face fall at your cold expression. "You still have a lot more to learn. Your mother has some impressive skills."

Valerie's chin wobbles and her eyes fill with unshed tears. "I'm trying Daddy...trying so hard..." she says with a small, hurt voice. You decide to push the issue, seeing where things will go with the two women.

"Yes you are. And you're a great little fuck, with tight little holes," you say seeing her face brighten. "But your oral skills could use work. Your mother sucks cock like she's been working in a brothel in Shanghai," you laugh. "You could learn a thing or two from her."

Deborah blushes, biting her lip and slowly stroking her tummy with one hand, while Valerie looks at her with curious surprise, then looks at you with determined eyes.

"Make her show me Daddy! Make her show me how to suck cock like her! Please Daddy, please make her!"