Waking Up As A Futanari: Transformed While Sleeping

Kayla was just a normal lesbian, living with her girlfriend, with not an ounce of interest in any man, or any parts of any man, in a sexual way. She didn't hold a particular disdain, but there was also a lack of interest, which made for a lack of knowledge about men. When Kayla woke up one morning with a very significant addition between her legs, her ignorance about male anatomy became a problem.
How will she deal with it? More importantly, how will her girlfriend Melanie deal with it? And why won't it ever seem to get soft?!