HP: Flowers and Butterflies

As children of Grindelwald, the Dark Wizard's godson, Flora Summers and Adelia Summers live "cautiously" at Hogwarts, afraid the others will find out.

Younger sister Adelia is a crybaby but obedient, a person of few words but great deeds. She says she's scared, then goes straight to using dark magic. Older sister Flora keeps to herself and looks down on everyone equally, showing just a little more patience when it comes to her sister. The two are worlds apart in personality, and their assigned houses are just as opposite: one is in Gryffindor, the other in Slytherin.

The sisters rank near the top in every subject, each shining in her own field. They brew potions and study spells, and are known as Hogwarts' most extreme pair of genius twins.

[Please note]

1. Pairing with Harry Potter

2. A simple, sweet romance

3. The setting is out of character and the logic may not always hold up

Premise: Flowers and butterflies, flourishing forever, never to be parted