As soon as Jen's mom untied her robe, she was naked and, in repliance, Jen's dad undid his flies and revealed his erect member, Jen's mom parked her vagina on it and started moving up and down, steadily at first but going increasingly quicker and quicker, as this process was happening, another was taking place, you see Jen's dad's cock was getting smaller and smaller, while her mother's vagina was getting smaller and her clit longer.
The first Jen's parents noticed anything was when her mom noticed that her dad's dick was smaller than it usually seemed to be, when she noticed that, her father noticed that his wife's clit was visible and seemingly growing longer.They both stopped after they reported each other of the situation by this point, Jen's mother's clit was 2 inches long as was for Jen's father's penis.
A few minutes of confusion and staring later, their genders had completely swapped and they were baffled but they started sex again but with Jen's 'mother' being a complete dominatrix, forcing Jen's 'father' to do her bidding like suck 'her' cock, enjoy being 'raped' and such similar acts of sexual activities.
After about 20 minutes the deed was over and Jen's 'mother left for work leaving her 'father' at home to get prepared for work but on her way out, Jen's'mother' couldn't help but hear buzzing coming from somwhere , shrugging, 'she' left and went to work.