This one-shot manga is about a magical boy who accidentally turns his older brother into a hedgehog. In the final pages he attempts to turn the brother back to normal, but instead turns him into a girl.
First Page:
http://mangafox.me/manga/hatsukoi_ha...mi/c001/2.html
TG:
http://mangafox.me/manga/hatsukoi_ha...i/c001/50.html