Tale of three sisters

Maxine, who is twenty two, was born a futanari, she has both with both male and female genitalia. Maxine is the oldest of three siblings, her sisters are called Beatrix, aged 19, and Florence, aged 18. When their parents died Maxine adopts her siblings but she has always kept her Futanari nature a secret from them. What happens when the secret gets out in the most dramatic way imaginable.