Tonks Has A Secret

Late at Grimmauld Place Hermione opens a door to find Tonks in a towel. Hermione sees a bulge under Tonks's towel which then becomes Hermione's secret. Harry soon finds out this secret as well as Tonks and Harry share Hermione between them. Futanari story. Futa on female or male on futa, not FUTA penetrating male.