"Pfft. You barged in here looking like you were planning on rescuing me or something, big man, big hero. Did you ever consider that maybe I want this?
You were right, all the times you said I seemed different in recent months. There were the obvious things like the clothing and makeup changes, but there was so much more going on under the surface...so much that my new friends showed me, so many things I've experimented with...the sweet little girl you thought I was has been buried for a long time now. I don't...hate you, but I knew I couldn't stay with you, not after all the things I've seen, the promises of a new life, of power...settling down for a domestic life with you would be dullsville.
Look at me...look at this body...it feels as amazing as it looks, I'm...I'm an animal, a beast in full command of my sexuality. Every thrust drives me further toward the brink, I can feel it...about to coalesce, or collapse into a singularity...I'm becoming what I was always meant to be, and you can enjoy watching me finish, as the ritual completes, as my final gift to you...a-aaaAAAAGHHHH!"