@Chronic Logic: If the author does a sequel, he should have Shizuku give birth to Violet. Then fast forward 10 or 15 years into the future. Violet was born as a natural futanari. Having grown up with both organs, she's in control of her lust; in a way she was never in her previous life. By this point in time, the dick god has conquered most of the planet, turning every woman into a futanari and all men have died off. Violet decides to fight to free the planet from the dickgod. She uses her powers to fuck futanari girls. Her ability doesn't make them lose their cocks, but instead makes them return to sanity and self control.
Alternatively, the author could make a new story with a different god. This new god also believes in "gender equality", so she gives pussies to men, so they can experience the pleasure of a female orgasm. Then you could have futanari women having sex with men, that now have pussies. And instead of having a magical girl main character, we'd have a Super Sentai male hero; who of course, would end up getting a pussy.