Chimerical: created by or as if by a wildly fanciful imagination, highly improbable.
Rose's favourite hobby was Matchmaking. She found her interest in it before she even started at Hogwarts. At the tender age of ten, brimming with innocence and youth, she began with her beautiful cousin Victoire.

Victorious: having achieved a victory; conquering; triumphant.
“Who’s the blonde you were just talking to?” asked Rose instead, keeping her voice as level and innocent as can be.

Hugo shrugged, clearly uninterested, “you know how Robert White is giving me Potion tutorials?” 

“Yes,” nodded Rose.

"That's just his sister, Charlize."

Mesmerising: to spellbind; fascinate.

Vague: not clear or distinct to the sight or any other sense; perceptible or recognisable only in an indefinite way.