Although that would be an ideal situation, I can't see it happening in the foreseeable future.
As I've learned more about my own anatomy (MTF) I've come to understand there are a whole lot of blood vessels, tissues, organs, and nerves involved with the whole "sexual organ" thing.
Add to that the various channels they fit into (the penis actually extends a few inches inside the pelvic area, and the testicle parts (which are removed during an orchi) extend into the abdomen.) A woman's parts are even more integrated with her internal organs; so it's not simply a case of cutting off the penis and scrotum, and sewing it on where the vagina/labia used to be.
I suspect that in the cases of penile/uterus transplant, (assuming they got the organ from a cadaver) that the process of cutting out the desired parts involved less-than-beautiful procedures....auto repair people probably do something similar when they have to transplant a body panel: They cut out the damaged part, measure the donor car
plus several inches of material in order to be sure it fits, then cut it out and trim as needed. A living human donor would not survive the removal of the needed extra tissue.
But someday we'll have Star Trek level medical knowledge...perhaps even better than transplants, we could have our own "male" or "female" parts cloned, and then grafted into the body.
We can hope! Best wishes in your relationship, btw!