With uncertainty.

Cindy stumbles around her words for a second before she is able to talk.

"T-t-thank you Master John. But... I am" She takes a breath, her encapsulated chest rising as she does so, and says "I'm not sure how to do what you want me to do."

An understandable thought. Cindy had gone from a Cheerleader to the first **** in your holy harem, with no thought gone into her own mental processes aside from "you want this."

You consider several ways you can handle this.

You could **** your Alpha to convert Yvonne without your help, and make her experiment without any of your powers.

You could give Cindy an innate and deep knowledge of pleasure and have her pleasure Yvonne until she submits.

Or you and Cindy could both go down on Yvonne and you could instruct her on how to make Yvonne her bitch.