The rule of three…

Both you and Houser have transformed into sexy women now. You are smaller and your form is sexually exaggerated but you are both feeble minded and geased to be sex obsessed sluts. You watch Houser's transformation. She grows shorter, her clothes become overly large. Her curves swell.

You have touched the tome thrice. The rule of three in magic applies. This curse is permanent short of a wish... Houser still has hope though. For the moment at least.

You pull the book from her confused grasp and smile wickedly. Then you press it into her grasp again. "Twice," you tell her as her breasts swell again. You pull it free and then thrust it into her hands. "Thrice..." her curves swell a final time. She is just like you now.