Parvati had been happily carting ahead when she froze at Christopher's words. Fortunately, her back was to him at the moment, so he missed seeing the look of absolutely murder in her eyes.
Parvati Malfoy hated being thought of as her husband's obedient wife, as if she was one of those pureblood women who required his permission to do anything. Especially if it was over a subject that she would, in fact, need to run by him.
"Pardon me?" Parvati whirled to face Christopher, her expression perfectly schooled into one of pleasantness and properness while her eyes blazed. "I needn't ask Draco permission to breathe, Christopher. Regardless, I am certain he would be fine with it, else I wouldn't have asked." She was talking in the clipped tones of pureblood upper society, meaning that, in short, she was pissed. "Although you clearly aren't, am I correct?"
Oh dear. Parvati's anger would later dissolve into hurt feelings that she would lament to Draco in tears. This would lead to a close to homicidal anger in him. For, in fact, Draco was often quick to indulge her as long as it hadn't anything to do with the Gryffindor trio. He may balk at the suggestion of the double date, may even scold her over it, but he would still go to make her happy. Draco liked Parvati to be happy and anyone who made her unhappy would therefore make a very dangerous enemy in him.