"... actually, is there a way that you could somehow let me choose my form in secret? I want to surprise you tomorrow morning."
"I think I can do something like that. Let's see... I will just say that you will become whatever form you wish to be tomorrow at exactly 5am, reguardless of whether or not I am awake." Said your girlfriend. Somehow you knew it had worked too.
That night Brooke wore you to bed, after turning you into a pair of extremely thin pantyhose. You honestly were tempted to stay like this because it was both very comfortable and very erotic. Since you were kind of unnaturally "skin tight" at the moment, which let you hug her every bump and curve, including those on her pussy, with almost no spot on her lower half left that you had not conformed to.
Feeling the exact shape of her pussy was really tempting you to just add on a condom part so that you could feel everything inside of her too. But you had something specifically planned that you wanted to really try that you knew Brooke normally would never agree to. At 5am, you felt the magic activate and were able to reshape yourself. Wasting not even a second, you change yourself into your selection.
You went simple with the design. Youbwere a pair of high heels, that would have Brooke standing on the literal tips of her toes. The thing is, your form was just the heel, and the straps which bound you in place around her ankles while forcing her foot to be angled downwards. Lastly a loop hung down and wrapped around her big toe. This loop would be what ensures that she can't walk in any other way than on the very tips of her toes or point of the heels, which was now made to be impossible by your sophisticated design.
Lastly, you found that you were able to make a part of you become a microsized vibrator which you stuck against Brooke's clit. It was so small that it was nearly invisible to the human eye, but would still be felt as if it were a normal sized one. This convinced you that life with unlimited magic would be really convenient, so you had a better understanding on Brooke's sudden desire to keep you as her magical footware.
Next, you then rigged yourself up so that whenever she put new pressure on either heel's point, the vibrator would pulse briefly. You couldn't wait for Brooke to instantly cum from not expecting the sudden shock of pleasure directly to her clitoris just because she stood up out of bed.