I thought about it as I looked at my nude sister and quickly decided that this was getting kind of perverted. Thinking about Dina's hot naked body was one thing, but incest; that was going a bit to far.
Then it hit me; a way to make it so that we could look and explore each others bodies and it really couldn't be considered incest. Could it?
Thinking to myself, I made the wish that Dina and I could be fraternal twin sisters and that nobody but me would know. Immediately the changes started. I shrank down to Dina's height. My chest ballooned outward to match her C cups and my waist shrank down. I could feel my penis and testicles shrink and then fold into my body as the area between my legs split and my vulva formed. Inside, I could feel reproductive organs shift and change. My hips flared out and my butt became something more feminine. As the changes completed, I suddenly knew myself as Beth, Dina's twin sister. We weren't one hundred percent identical, but we had some come traits; like hair and eye colour plus we both could easily fit into each others bras and pants.
Suddenly I heard my sisters voice asking rather coyly, "Does my tom boy of a sister still want to do this?"
Nodding, I slowly began to strip; feeling that this was normal.