A/N: Once upon a time, there was a fanfic. This fanfic was called "Ronald Weasley and the Curse of Reverse." In the fanfic the characters have no need to go to the bathroom for reasons that will soon become clear.
Everything was going according to plan: so far Ginny was walking behind the golden trio with a small group of Gryffindors, and Harry was ahead, keeping up a conversation between Ron and Hermione. Once they were all in the Great Hall for breakfast she whispered, "Adhaeresco celo dialecticus," just as her target whispered, "retrorsum."
The effect was immediate, Harry started sliding backwards while Ginny sprung forward; they were instantly glued at the hip. "What the bloody hell?" Harry yelled as everyone in the Great Hall turned to see what was going on.
"It backfired! I can't believe the spell just backfired!" Ginny was in near hysterics.
Ron doubled over in laughter.
Hermione spun on her heal to see what had occurred. She put her hands on her hips in a way that reminded Ginny of her mum. "Would anyone care to tell me what's going on?"
"Yes I would like to know too." As soon as the four teens heard the stern voice of Minerva McGonagall they quieted down. Ron stopped laughing, Ginny blushed, Harry looked at his shoes, and Hermione glared at Harry and Ginny, who were obviously the ones to blame. "Well? Would anyone care to tell me what just happened? Mr. Potter? Miss Weasley?"
"It was my fault professor," Harry said. He knew the professor would find out anyway, so he'd be better off confessing, it might get him an easier punishment. "I found the spell, and wanted to try it, but I honestly don't know what happened because Ginny and I weren't supposed to get stuck, Ron and Hermione were."
"Harry that's a lie!" Ginny snapped "I found the spell and I cast it, but it backfired."
"But it was my idea to use a sticking charm," argued Harry.
"So you will both take the punishment," said Professor McGonagall. "But first I must know what your motives were and what you did, in order to reverse it."
Ginny held her head high, even though her spell had backfired, she was stuck indefinitely to Harry Potter, she was about to be punished, and by now most of the students who were present were listening to their conversation. "Ron and Hermione are extremely thick." Hermione huffed in annoyance. "Well you are! The whole school knows Ron fancies you, Hermione, and you haven't exactly been secretive about it either." Ginny could almost see McGonagall's lips twitch as if she were about to smile. "So we were just going to help you two figure it out as well."
Harry took over the explanation, "we found a spell which would make the two of you stick together whenever you talked about each other, but I don't know why it backfired."
Ron couldn't contain himself any longer. "I knew what your plan was, and I found the spell that made it turn against you." He left out the fact that he'd thought it was only a reverse for the prank.
"That was very clever of you Ron!" Hermione complemented; Ron looked like he was going to burst with happiness.
Harry cleared his throat. "When's our detention professor?"
"Detention, Mr. Potter? No, you and Miss Weasley shall not be serving a detention, instead you shall spend the rest of the day the way Miss Granger and Mr. Weasley were to spend their day- that is to say stuck."
Ginny looked horrified. Harry wished he had his invisibility cloak; it wasn't that he was upset about being stuck with Ginny, it was more that their prank had failed, and everyone would be watching them all day.
Walking proved to be a challenge. As soon as McGonagall went back to the Head Table Harry and Ginny tried their best to get out of the Great Hall without drawing too much attention to themselves. This also proved to be difficult since almost everyone in the Hall had witnessed the exchange, and it really didn't help when Harry walked faster than Ginny, and essentially dragged her to the doors.
As soon as they were out of hearing range of the rest of the student body Ginny wailed, "how exactly are we going to manage this? I don't have any classes with you."
Harry was still finding it rather awkward to be attached to Ginny, and his blush could easily rival any Weasley. "Er- what classes do you have today?"
"Muggle studies, transfiguration, and double charms. You?"
"I've got Potions, Herbology, and Double DADA."
Ginny groaned, "sounds like we're going to have to go to your potions lesson, my transfiguration lesson, and Defense against the Dark Arts. Can't wait!" she said sarcastically. "This would've been so much easier on Ron and Hermione! They're practically attached at the hip already!"
Harry laughed, yes he was embarrassed, but he might actually have fun with Ginny today. "Too true! We could probably get the invisibility cloak, and use that in between classes, but we can't during."
"Ok, that's not so bad, we'll just sit at the back of the class and just act like this goes on every day."
"Good plan. Now we just have to figure out how to walk."
They finally figured it out when they'd reached the common room; the students who hadn't been in the Great Hall at the time of the "incident" looked confusedly at the sight before them. The first to notice them was, of course, Dean, the person Ginny wanted to see the least at the time.
"Ginny what's going on?" he asked, scowling at Harry.
"Prank gone wrong," she muttered, and tried to push past him toward the dormitories.
"What prank?"
" Well we were trying to –" Harry began, but was cut off by Ginny.
"Sorry Dean, we don't have time to explain, I've got to go get my stuff and so does Harry, it took us almost half an hour just to get up here." Then she pulled Harry up the stairs to his dormitory. "Sorry, I just don't think I should have to explain it to him," she apologized to Harry. "If I feel like being stuck to my best friend for the whole day then it's none of his business." She said with a nod.
"I'm your best friend?" Harry asked giddily.
"Yep, now let's get your stuff," she said hastily "I still don't know how we're going to get into my dorm though, what with the charmed staircase and all."
"I hadn't thought of that. We could try summoning it." He suggested.
"No that won't work, I've tried before, you're not supposed to be able to summon anything from the dormitories, because it'd be too easy to get someone else's stuff."
"Oh. Do you have your wand?" She rolled her eyes at him. "Ok stupid question, of course you do, you're the one who cast the spell. Do you need anything besides your textbook? I could give you some parchment and a quill so that's not a problem."
She laughed. "This is ridiculous! I could just ask someone to get my rucksack for me." Harry had to laugh; it was just such an easy solution he couldn't believe he hadn't thought of it.