At the time, Hermione had thought it was completely preposterous. Harry hated him. But as time came to pass, and threats and curses flew their way on the hunt for resistant Death Eaters, Harry had come to respect and even admire Malfoy. They worked well together, and apparently, he had a wicked sense of humor. Differences were pushed aside over the course of many months, and as a result, had ensued an ill-fated (from Hermione’s perspective) friendship. 