Ron and Ginny use love potions on Hermione and harry only one problem, love potions don't change sexuality. In stead it switches to the closest family member in terms of personality and age ie each other

Thing I want in the story.

Harry is already dating one of the other Weasley brothers

Hermione is dating Luna or Tonks if set after 4 year

Ron and Ginny don't know about the sexuality rule

only Sape suspicious of the two siblings

Dumbledore is massively against harry being Gay

thing that are ok not to have

Hermione and Harry get in trouble for unwanted attention towards Ron and Ginny

harry with both twins

Ron and Ginny over does Hermione and Harry

Hermione girlfriend brakes up with her because of ginny

mrs Weasley is using love potions on mr Weasley

mr Weasley really loves, one of the female professors at Hogwarts