Harry Potter was oblivious. It enraged Hermione as few things did.

She'd tried to explain. She'd used the words "sublimated homoeroticism" and watched Harry's eyes glaze over. She'd showed him the appropriate pages in Hogwarts: A History. When Harry wrestled Malfoy to the ground and pried the snitch out of his fingers, she'd dragged him aside by the ear and explained about broomsticks. Harry looked increasingly hunted. Hermione wanted to scream.

"Harry," she said finally. "You plus Malfoy equals sex. All right?"

"Oh," he said in a small voice. "Did I agree to that?"

Hermione sighed in long-suffering exasperation. Oblivious!

Written for the first line challenge. The first sentence is from Dorrie6's A Meddlesome Sort