It's possible that no one ever lost as much in a divorce as Stanley

 

GenderBenders by Katie Oslow

On Kindle and Kindle Unlimited

Intended Side Effects

After an experiment causes a dramatic transformation, Jeff Fisher has to cope with the loss of his manhood a newfound love and make a decision that will change everything. 
https://www.amazon.com/dp/B0BC2HHJGZ

Prince Yorick the Bride

The boy who would be king, becomes 
The damsel forced to marry the villain.
Can she rescue herself? 
https://www.amazon.com/dp/B0B5NM5G9L

One Gallon Challenge

Angry about a breakup, Agnes turns Dean into a woman who must face a humiliating mission to win her manhood back 
https://www.amazon.com/dp/B09SHVB6ZQ