The cabin got covered with smoke again, Katie heard Tiff complaining of some pain, but she seemed to feel less pain than Katie felt when she changed.
When the change was over, the door opens and Tiff comes out. But something was wrong. Tiff was taller, she had visibles muscles in her belly and her cock, two big to fit inside her panties, hanging between her legs. But her face was still the same and her breasts had grow enough to rip her bra.
"What happened to you Tiff? You got masculine traits, but female traits increased instead of disappear." Katie asked
"Don't tell me you messed up with the controls." Tiff said
"No. I did exactly as you said, there is no way I could have done it wrong." Katie complained
"Let me see." Tiff said as she went to the controls. Looking at it she said, "I found the problem, you didn't pay attention and didn't realize that you pressed the male and female buttons at the same time. Then maybe," Tiff took of her panties and examined her genitals and said. "Yes, as I thought, I still have a vagina."
"I'm sorry, I should've paid attention." Katie said
"Don't worry. As a mather of fact, I think this is better." Tiff said. Then she looked to Katie and saw that he...