Irritating

Cassiopeia Wallace despises Sirius Black. But her parents betrothed her to him anyway and just for the sake of money. Cass cringes at the thought of marrying Sirius but maybe he isn't all that bad. Maybe if he took his sarcastic, humorous armor off he wouldn't be as irritating as Cass thinks... But he's still Sirius Black. (Slight AU in which Sirius doesn't run away to the Potters)