The rule is self explanatory. Harry/Cho. Deal with it.

Never Date a Witch or Wizard with a Broken Heart

Harry had never been more grateful for the Room of Requirement before. Without it, he wouldn't be standing here surrounded by the smartest, bravest and boldest sorcerers he'd ever encountered. It was time for a change. With the new reign of Umbridge over Hogwarts, it was time to take action. To rebel against Umbridge and her unreasonable regulations. To create an army. Dumbledore's Army.

They'd been going at it for a few weeks now and this was the last DA meeting before Christmas. So far, Harry had covered the proper way to disarm an opponent, how to render someone unconscious and today, how to conjure a Patronus. But when it came to this topic, Harry was sort of hesitant. He had been able to produce his since third year, but he could remember his training with Lupin clearly in his head and even he, the great Harry Potter, took multiple times to materialize a Patronus.

"Everyone," Harry said in a voice that commanded the attention of each person in the room. Almost instantaneously, all eyes were locked on him. "We all know what a Patronus is, right?"

There was a roll of mumbles and nods in Harry's direction.

"So what exactly is a Patronus then?" His green eyes scanned the witches and wizards in front of him before calling on one. And, of course, Hermione had her hand up in the air. Harry sighed and let out a chuckle. "Hermione?"

"It's a positive force that acts like a shield. It can repel Dementors, too. But in order to do so, you have to think of something that makes you happy, like a memory."

"Right," Harry said smiling. "So, in order to produce a Patronus, you've got to have a happy thought. Actually, it has to go beyond happy, beyond something that makes you laugh … it has to be something so intense and dominant that it can drive any negative force away." Studying the crowd in front of him, he saw some who were nervously tapping their feet and biting their lips, already pondering their happy memories even before Harry had told them to do so. "So, take a minute," Harry said, "and search for that memory." He gave everyone a moment. "Alright, now watch." Harry drew his wand, held it out in front of him, inhaled a deep breath of air. And, as if he had a time turner, he took himself back to third year in his head. Back to that room where he stood next to Lupin, uneasy about learning a new incantation he'd never even heard of before. But once Lupin had informed him on what to do, he thought of his memory. He had to try multiple times and he fainted on every attempt. Now, in fifth year, he knew it was due to the fact that his memory wasn't nearly strong enough. But on the last try, he'd done it. He remembered his mother and father sitting and talking. A simple thought, but it was one of the few that he had of them. He'd allowed that memory to spread throughout his entire soul, leaving no room for any other thoughts or feelings but happiness. It was so overwhelming, that even thinking about it forced him to let go of thinking about third year, only about his mother and father and utter those magical words, "Expecto Patronum!"

Following that, a ghostly stag fluttered into the air. It seemed enchanting, but still almost lifelike and the air around everyone seemed to radiate a delightful heat. People gawked as it walked around the Room of Requirement, illuminating a gleaming path wherever it went.

Harry withdrew the incantation and his Patronus vanished form the air. Everyone came back to reality, their eyes looking far less dazed and transfixed than they had been ten seconds before.

"Cool," uttered Ron, breathlessly.

"Can we try?" asked Fred, who stood next to Ron, just as equally fair skinned and red haired.

"Yeah," said Harry, running his fingers through his jet black hair. "So the words are–"

"Expecto Patronum, yeah, yeah, we get it," said Ron. "Can we please just try?" Harry resigned and let them try.

There was a wave of people chanting the spell and an array of twinkling, pearly mist that swirled and lingered in the air before disappearing.

"Harry!" complained Ron. "Nothing happened!"

"That's exhausting, Harry," said Hermione, looking rather flushed.

"That's just the beginning of it," Harry explained. "When I trained in my third year with Lupin, I fainted. He had to give me chocolate."

"Chocolate?" Ron said, wide eyed.

"It helps when battling dark forces, Ronald! You would've known that if you'd paid attention in Defence Against the Dark Arts!"

Ron's temper had begun to rise, "Hey! That's one of the few classes I actually do pay attention in! You're constantly telling me that I don't pay attention and you have to point out everything I don't know!"

"Okay, you two! Not here!" Harry roared. "Just … relax and try again."

Ron rolled his eyes and Hermione soughed.

Several minutes passed, and, before Harry knew it, he had seen a few people actually produce their patronus, the first of which, surprisingly was Ron. Luna followed him, then Cho and then a few others. However, as Harry had predicted, there were a few who hadn't managed so well, one of whom was Hermione.

The last few minutes were approaching and Harry was prepared to wrap up today's meeting, but before he could say anything, he was interrupted by a loud shriek, one that belonged to Hermione. She had managed to create a silver otter that swam about the whole room. A smile spread across Harry's face, and he concluded today's DA meeting on a good note–that was until he was alone … with Cho.

She stood in silence, gazing at the picture of the late Cedric Diggory that was pinned to one of the walls. Though Harry had always thought poorly of Cedric (when he really just envied his former relationship with Cho) but now, he couldn't help this heavy hearted feeling that he held in his heart. He contemplated what to do in this situation. He could confront Cho, or leave her to herself. But with Harry being Harry, he felt the need to come to her aid and make sure she was okay.

He stepped up behind her, trying not to get too close, but close enough in order to comfort her.

She jumped at the sound of his foot hitting the ground. She gasped, "Oh, Harry … I … I was just … leaving."

But Harry stopped her before she could get too far.

"No you weren't," he said grabbing her wrist.

She erupted in tears. "I'm sorry!" she sobbed, freeing herself from Harry's grasp and crying into her hands.

"Sorry for what?" Harry said, taking her hands away from her now puffy eyes.

"For … I dunno, being like this? I just … I don't mean to be a wreck. I just … I never would've imagined that he would be … be …" The remains of her sentence were lost in muffled cries.

"Cho," Harry said, capturing her gaze, "he died doing what he loved. He was a great man and you know that."

"I … I know," she sniffled, "I just …" She looked up above her head and muttered, "Mistletoe."

Harry looked up. There, above their heads, was a small bit of mistletoe. It taunted him, but he wasn't going to make a move on her now. Not like this, that was.

But apparently, it teased her more than it had him. She poured her gaze into Harry's emerald eyes and at that, she kissed him, melting into his arms.

This wasn't perfect, kissing a hurt girl who's heart truly wasn't his. It was anything but perfect. In fact, there was one perfect word for it. Wet.