This story is inspired by the Red Dwarf episode 'Parallel Universe' (series 2). I own neither Red Dwarf nor Harry Potter and am making no money etc. etc. so don't sue. You know the drill guys, (.

Enjoy!

"You've got your basic dimensions, length, breadth, depth and time. The fifth dimension is co-existing realities, two bodies sharing the same space but unaware of each other...there will be differences," - Holly, Red Dwarf's trusty computer.

"Where have you two been?" Hermione snapped irritably as her two best friends burst through the portrait hole. This was not her day. Ron and Harry had crept out without her while she had been studying and they had been playing wizard chess. It was the Christmas holidays, and her, Ron and Harry were some of the few Gryffindors who had stayed behind. The fact that she didn't notice them missing for awhile and their wide grins didn't improve her mood one bit either.

"Guess what we found?" Ron said excitedly, plonking into a seat across from her.

"A thirteenth use of dragon's blood?" Hermione said, her voice dripping with sarcasm. Ron chose to ignore this comment, instead placing a book with a thump down on the table. Hermione glanced at it. 'Little Known Spells' was embossed on the cover in peeling gold writing. It looked very old. "It's a book," Hermione said flatly.

"But not just any book," Harry chirped eagerly, sounding like a salesman, "we found it in the library," Ron clapped his hand to his forehead before giving Harry a look that plainly said: That was the part we weren't going to tell her, REMEMBER??

"Which part of the library?" Hermione asked, eyes flashing dangerously as they narrowed. Ron pasted on an innocent smile and tried to talk his way out of it, but Hermione persisted, enjoying seeing him squirm under her gaze, mainly because of her mood. "Which part?" she demanded. Ron's eyes darted around the room as if looking for an escape, before lowering in defeat and muttering, "The restricted section,"

"You stole a book from the Restricted Section?" Hermione cried, allowing her voice to rise a few notches.

"Not stole.." Harry began, and Hermione looked sharply at him. He flinched. "More like..borrowed," He'd set himself up and they all knew it. Hermione went in for the kill.

"Without a signature?" she said, "That's stealing," she leaned back in her chair with a smug look on her face and crossed her arms as if closing the subject. "I want nothing to do with what you're planning,"

"But Hermione.." Ron said, and she rediverted her gaze to his face, "we need your help." He summoned from within him some of the eagerness he had had earlier, "You see, we found this brilliant spell.." As if on cue, Harry picked up the book and flipped through the pages. After a minute or two, he replaced the book in front of Hermione. She held Ron's gaze for a moment longer to build suspense, and the cast her eyes at the open book in front of her. The pages smelled musty. The writing was in old font and faded in places.

'Skipedia Dimensa

DIMENSION SKIP'

Announced the title. Hermione's eyes widened with interest. Harry and Ron exchanged glances with grins, they knew they had her now.

'Skipedia Dimensa is a complicated spell and one that has been performed few times throughout history. Because of its obscurity, no law has yet been past by the Ministry of Magic to forbid this spell. Skipedia Dimensa allows the caster (person performing the spell) to cross over to the next dimension, i.e. co-existing realities.

Hermione looked up with her mouth open. "Come on Hermione, you have to admit it would be fun," Ron tempted.

'And we need your help, we can't do it on our own," Harry threw in a bit of flattery, and both he and Ron gave Hermione puppy dog looks. Hermione bit her lip. She was torn between paying them back and skipping the risk of breaking the rules; and seizing the opportunity of a lifetime and having a bit of fun. What should she do...