He wished for "unrivaled sexual power and technique" but failed to specify that those be male heterosexual. Further, he directed the woman be an obedient slut who wants it and will "absolutely" enjoy herself.
The only one who had no idea whatsoever that the protagonist in this story would become such a shameless deep throat queen in no time was they, themselves -- we all knew that this inevitability was coming (er. "cumming") for them, and that they'd take it to-the-hilt with abandon!!!