I think the story is posted on Fictionmania (I've been looking for it unsuccessfully over there anyway). The synopsis as I recall it:
Man and wife are deeply in love, but the man has a secret. Wants to be a woman. Sets up meetings with 2 men in another city to experience sex as a woman. Does so, but is overwhelmed. Crashes car returning home (attempted suicide). Tells wife what he has done. Wife leaves him, but forgives him after about a year and moves back with him. The husband transitions eventually having surgery. Wife supports and participates in sexual experiences (three ways) of the new woman. The story is told in episodes over a number of years and involves a therapist (I think in just the later parts of the story). It's written to feel that it's real world. I believe the title includes the wife's name, the before and after surgery female names of the husband (not sure though).