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Naruko's secret was that even though she was a woman, apart from having a pussy, she also had a cock. She was the type of woman who was called a futanari.

underneath her pants, she had a long cock about 8 inches long, and 4 inches thick that didn't even allow her to wrap her hand around it, fed by bulging veins that could fill it with blood and life, along with a pair of big fat balls full of cum.

Enough for her to have to spend all her days under a transformation jutsu of her that prevented anyone from noticing the bulge in her pants.

It was something she hid since her childhood and very few people knew about her secret and besides she was completely fertile both ways.

Capable of impregnating any woman with ease... or that someone could impregnate her.