“No Sam, please don't do this to me!
Don't you remember that I was a guy and your close friend just few hours back?
It all happened because of your younger sister. She was playing with a spell book and mistakenly read a gender transformation spell out of it and that spell transformed me this beautiful girl.
So please don't touch me, Sam. My new body is too sensetive to resist you.”
Though after a while Ron (who was now transformed into a girl started moaning & doing things relectantely
“Ooohhhhh It feels so good”