Is it wrong for a fourteen-year-old girl to have sex with an, I'm assuming, 20-something year old woman?
Is it wrong for a fourteen year old girl to have sex with her father? Illigitimate father, but father figure, nonetheless.
No. Taboo, most probably, but not wrong, according to nature.
The above two things are from Mai-Otome, by the way. (Tomoe and Shizuru/Nina and Sergey).