Marvelous!
(If you expunge this, you are a nazi!)

Ok, here the story:
After a series of failed experiments, the Americans decide to admit women in the "super-soldier"; after another series of failures, at last a success.
After the scientist heading the project was killed by nazis, the woman is trained and sent into battle.
She was captured by the nazis, interested in the super-soldier. The prisoner is valuable, but also dangerous. Since get her pregnant is too risky (who holds such a force for 9 months? And if she escapes?), the nazis decided to use a serum that increases penis size, that they have developed and already tested on Jewish prisoners; also tested on Jewish women, the serum makes growing a fully functional penis; They inject the serum in super-soldieress to obtain the gene through her sperm, which will have to fertilize women selected to improve the Aryan race.
The photographs showing the metamorphosis has been lost (rumor has it that they ended up in the personal collection of some nazi).