Rihanna sitting up noticed that she was a bit taller when she bumped her head on the ceiling. The little house they had rented near the beach had the bed under a low ceiling with a small room above it. Last night she was able to sit up and read with the ceiling right above her head although now she had hit her head. Besides that her arms felt a little more heavy as well and a familiar weight on her chest was missing... and her clothes felt really tight especially around her crotch.
She looked down and saw her nightgown tight over a broad, but mostly flat chest. She patted her crotch and felt a bulge. She got up and took off her clothes and saw that she was now a guy. Her hard dick looked about a foot long, her arms and legs looked fairly well muscled along with having six pack abs, and she seemed like a foot taller at a total length of 6'7''. Rihanna felt like going to the bathroom and decided to go there. He was a guy now so may as well experience pissing out of a dick while standing up.
Getting to the bathroom she heard someone who sounded female mumbling to herself Rihanna asked "Dave is that you in there?"
A voice asked out "Rihi? is that you?"
Rihanna responded "Yes. I'm a guy now somehow. Based on your voice i'm guessing you're a girl now?" he tried the door which was locked.
Dave said "yes... give me a second. i'll unlock the door..." A second latter the door opened revealing a female dave. She was a foot shorter than she was as a guy at 4'9''. The clothes she wore her shirt more like a short dress which covered some fairly large breasts obscured by the fabric. She looked cute though. her face flushed red and asked "Why are you naked!?!"
Rihanna said "my nightgown was really tight and I had no clothes to wear... although I suppose a more important question is what switched our genders like this?"
Dave said "Well let's retrace our steps... We came to the beach... had a good time there, had a good dinner out, and then came back and then had a little fun in bed."
Rihanna said "Alright then... so how about we "