You accept

The possibilities far exceed the limitations Sarah has placed on you, it only takes a second for you to contemplate the deal, "Ok honey, I accept your terms" you answer.

"Yay!" Sarah exclaims as she wraps her arms around you and embraces you with a deep, wet, passionate kiss. Eventually you both have to come up for air, Sarah leanes back slightly, "Could you do just one more thing for me?" she asks, you nod, "I want to watch it happen" you look into her eyes, her excitement is clear, you can already feel her nipples getting harder, lightly pressing into your chest, "Well honey?" she questions, "Lets get started!"

You still can't believe this, you can feel your heart threatening to burst out of your chest at any moment, your little reserved, tame, shy Sarah has consented to having you change her appearance in anyway you see fit, it was mind blowing. "Ok, ok, lets just go somewhere a bit more private" you state moments before teleporting you both to her bedroom, complete with three full length mirrors, placed in a concave pattern, allowing Sarah to see most of her figure at any one time.

"Wow! OMG!" Sarah says in shock, "That was weird" she adds as she takes in her new surroundings, "Warn me next time you do that ok?" she says finally looking back at you.

"Sorry honey, it won't happen again" you reply with a soft smile, Sarah kisses you again before moving over to the mirrors, you take a seat on her bed, using your powers to adjust the bed's mattress to your liking.

"Erm, sweetie?" Sarah says getting your attention, you snap your gaze back at her, her hands are clasped in front of her and she's looking at you expectantly, "When you're ready" she adds with that wonderful smile. You blush when you realize that you'd gotten a bit side tracked with the mattress.

"Oh, yeah sorry, lets start off with something simple" you say, wanting to save the really good stuff for last.

"Remember the deal sweetie" Sarah states as she turns to look at her reflection.

"Yes honey" you reply like a well trained pet.