I want to figure out the most extreme transformation story possible, in both the physical and the psychological sense. I liked the story about how the guy and his buddy made a bet with their wives that they couldn't become girls, and then were hypnotized and surgically transformed into gorgeous she-men. The one problem with it is the lack of decision. These men did not decide on their own to become women, they were manipulated into accepting it and enjoying it. I want to explore what happens to somebody who succumbs without coercion. Someone who succumbs completely and enthusiastically.
Someone who accidentally discovers, say, his girl's panties, and finds himself pining for them, and for other articles of her clothing. And this slowly transforms him until he becomes completely female.