Jinx by Twilight

Best friends Veronica "Ronnie" Valencia and Charlotte "Charlie" Destery are in their 6th year at Hogwarts School of Witchcraft and Wizardry.
Twin brothers Fred and George Weasley are in their 7th year at Hogwarts. With their joke business booming, their friends/girlfriends are always in the middle of their latest scheme.
Along with the girls being dragged along into everything Fred and George pursue, they're also recruited to help Harry, Ron, and Hermione with the adventures they face.

Tobias, Ronnie and Charlie's cat

**This series takes place in the 5th book, so the girls are one year ahead of the Trio, and one year below the Twins.

"'We've always known where to draw the line,' said Fred.
'We might have put a toe across it occasionally,' said George.
'But we've always stopped short of causing real mayhem,' said Fred.
'But now?' said Ron tentatively.
'Well, now –' said George.
'– what with Dumbledore gone –' said Fred.
'– we reckon a bit of mayhem –' said George.
'– is exactly what our new Head deserves,' said Fred" (Harry Potter and The Order of The Phoenix)

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