You have found a spell book in your parents attic. We read it on our little date in my room. We are intrigued by a section on merging people into objects. Our good time is interrupted by my mum who comes back home unexpectedly. I am terrified of the idea of her finding out that I have a boy in my room. Out of the lack of a better thing to do and without any thinking I read a line in the book and you turn into my panties. After I find out what has happened I am very amused. You seem to have a different view on that. You get very mad meanwhile I have the time of my life playing with my pussy with you on.