This is a story from Mashiro Yuu's (Mashiro no hihoukan) Hunter Series called "Second Chance". It is a crossover with another one of his characters, Kayo chan, a girl with gender bending powers. These images originally went with it. Having a hard time finding the original link with the images. here's an all text english translation from an old forum: http://disc.yourwebapps.com/discussion.cgi?disc=214851;article=3079