Cassi Malfoy and Her Gay Brother

Cassiopeia Malfoy loves her brother Draco, but if he talks about Harry Potter one more time, she'll hex him. It's Cassi and her twin's 6th year at Hogwarts, and Draco has been tasked with killing Dumbledore. Can Cassi keep her brother from slipping away from her, and maybe get him to confess his feelings for the Chosen One...? (There will be some obvious alterations to the story)