Humiliate her

Harry took Narcissa's wand out of her robe pocket. "Get on your hands and knees, slut."

Narcissa clenched her teeth so hard it hurt, but did as she was told. She yelped as Harry unexpectantly shoved her wand up her tight, virgin anus. He shoved it in three-fourths of the way before walking in front of her and unzipping his pants. "Suck me off."

Narcissa sat up, wincing from the pain of her wand up her ass and started to suck Potter's cock. She had never been so humiliated, but she still preferred this to Azkaban as her sister had told her all about how horrible and nasty it was.

Harry grabbed Narcissa's head and throat fucked her. Narcissa was hardly an expert on sucking cock. She and her husband rarely had sex and it was always missionary. She gagged on Harry's cock when he rammed it in to the hilt. He continued to roughly face fuck her. "Ever heard of Creamy White Wort?" he asked.

"Mmpp nnnuh."

"My friend Neville discovered it. It's a plant that when taken not only increases sperm production, but makes the sperm thicker, and stickier...ummmph...as it leaves the penis." He pushed her off of his cock and started shooting massive ropes of thick, sticky cum all over Narcissa's face. By the time he finished, there was cum dripping from her forehead, nose, chin and lips and her right eye was nearly glued shut with cum.