It was officially the first day of December and student from every house came down to the Great Hall, early in the morning to watch the moment Hogwarts put up all of the decirations many waited in their dorms for the fairy lights and the trees to go up. The first years had never seen a christmas like it.

The ceilings were bewitched with candles and across the walls holly and ivy appeared in large bunches. The lighting of the castle made it really feel like celebrating. A large, decorated tree went up; with glass snowglobe decorations that continually snowed as well as twinkling fair lights. Professor Dumbledore pulled out the large ball of lights and shook his head with horror, it amazed him that the muggle lights managed to get tangled even when not in use. Luckily, with the help of magic, Professor McGonagle managed to hang the lights on the tree within srconds.

All this merriment still couldn't shake the sour Professor Snape, he hated Christmas as much as he resented those who enjoy this time of year. He was the Scrooge of the school...he'd actually been known to hand out detentions as lightly as pulling crackers.

Of course not everybody was so negative at this time of year; one boy had been waiting for this opportunity to raise the roof. Harry had been planning what to do over the last few days...sure he had the gender swap potion and the infatuation potion but what he'd do with them was still a mystery. He'd thought about slipping Snape the infatuation potion and quickly take the gender swap potion... Would Snape buy it? Would Harry actually do it; he's no romantic or even remotely spontaneous.

"Harry you know that you're not allowed out after curfew remember last time..." Ron had caught his friend in the act. Harry was in fact leaving their dorm room.

"I know Ron. That's why I'm taking my dad's cloak this time." Harry unveiled the cloak from between his arms.

"Alright then...just don't get caught we need you out there tomorrow." Harry had to play tomorrow or else Gryffindor would loose to Slytherin thus facing a round of moccary until Christmas was over.

"I won't trust me." Harry was going to see Snape tonight. He didn't have much of a plan but he was best at making things up as he goes along.

"See you tomorrow then Harry." Ron truged back to bed, Harry knew that Ron probably wouldn't remember this conversation because Ron was nearly asleep...it was a wonder that he didn't begin snoring as he walked back up the stairs.

"Right..." Harry was worried about getting caught but even more so worried about being caught by Snape and then having to go straight to Dumbledore.

Harry followed the long maze of corridors without making a sound, he didn't use his want to navigate otherwise that would blow the illusion and probably wake some paintings. Harry knew roughly where he was going, he was headed to the girls bathroom on the second floor, it was too far to the ground floor toilets seeing as Snape's office was the last room at the end of the corridor.

When Harry reached the bathroom he shook off his cloak; for such a thin material it was awfully stuffy. Harry wasn't wasting any time it was too risky this bathroom is checked regularly with whomever is on patrol. Harry pulled the gender swap potion out of his right pocket and poped off the lid. Harry knew that if he slowed his pace then he'd loose his confidence. So like ripping of a plaster he downed the potion in one sour gulp.

Nothing had happened, Harry expected for the potion to happen instantaneously but he found himself staring at his own reflection.

"I'm still me." Harry threw the bottle down a toilet, piled it high with tissue and flushed the chain. He watched as the bottle swirled away. "Damn..." Harry kicked himself for being to optimistic.

Harry ran the cold tap and washed his face with the water. It was much unpredicted but as Harry rose his dripping face to stare into the mirror hair began to grow, long black hair stretched out from his scalp. Harry ran his fingers through the hair, unlike his usual mess of hair; the hair was silky and smooth. He laughed to himself, it was fantastic.

His bottoms became snug as if there was noting filling them. Harry had to check it out. He pulled at the waistband of his pjymas and gawked horrifically. His penis was gone! Now there lie a vagina it was surprisingly neat, not that he'd ever seen a girl's vagina before but just the thought of it alone turned him on. Out of curiosity he had to touch it. It was very different from what was usually in that spot. So a nervous hand crept down and glazed over the strip of hair; Harry had that before but as his hand glided further down it became more alien. There were flaps, two of them and a loop of skin that was sensitive to the touch. Then there was the hole behind it all, it was obvious what that was for.

"I hope this works..." Harry was worried that his newly appointed vagina wouldn't work when needed.

That wasn't the extent of it, Harry's shirt grew surprisingly tight. As two large breasts protruded from his chest. Straight away he could feel the cold draft in the bathroom, it made his nipples hard. Harry was shocked that ge was gifted with such a large pair of breasts, they were definitely bigger than Hermione's. Harry just had to look, he'd seen breasts in magazines and on the tv in fact he was quite fond of breasts. It was amazing that he had a pair of his own to inspect. So he pulled up his shirt. His breasts were round and soft so much so that they'd make excellent pillows. Sure his nipples were hard but he knew that they'd soften when it was warmer.

Harry put down his shirt and once again focused his attention on the mirror. His face had changed. His eyes were more rounded, his cheeks were a pale pink, his lips fuller and his jaw smoother. It was a wonder, he still looked very similar.

"The scar..." His scar was still on his forehead. It would definitely be a give away. "I knew this wouldn't work..." Harry stopped for a moment and thought. 'if I slip Snape the infatuation potion then it won't matter.' "You can do it Harry." He told himself.

Harry flug his cloak over his body and snuck out of the bathroom. He ran a hand over the wall to guide himself around. Harry had always had delicate hands but now he had a delicate waist, delicate chest and extremely delicate private parts.

Harry stopped outside Snape's office for a moment, his new body had given him the confidence to make it this far. Now he only wondered how he would announce himself and what approach he'd take; sexy, innocent or just pounce.

Harry knocked on the door and waited to hear foot steps before taking off the cloak.

"Who is it?" Snape barked at the door.

"I'm new! I just need some help..." Harry's voice had changed, it'd gone up an octive now he sounded like a girl.

"What is your name?" The door was still closed between them. Harry gulped as he tried to think of a name for himself. At that moment he was blank.

"My name is...Kim. Kim Bell." Harry lied. Snape unlached his door and opened it wide.

"Don't you know that it's against school rules to be out of bed at this time of night Miss Bell?" This seemed all too familiar.

"Yes...Professor...?" Harry pretended not to know who Snape was. At least Harry could sell his character well enough for Snape to have opened the door.

"Professor Snape. When did you arrive?" Snape glared down at Harry.

"Today...I was out of bed because Dumbledore got a letter from my parents. He needed to speak to me. I told him that I knew my way back but it seems as though I don't..." Snape scoffed at Harry.

"What is your house?" Harry had to think, if he was in any house but Snape's then Snape would only show Harry the way back to his dorm.

"I'm in Slytherin. I came just after dinner today..." Snape wondered why he hadn't seen this girl or was introduced to this girl before now.

"I'm the head of Slytherin." Snape cleared his throat lightly before stepping aside.

"Sorry Professor Snape. I didn't know. This is awkward...fancy meeting your new student in her pjymas." Harry tucked a piece of hair around his ear and walked on through.

"It's fine. I'm sure you'll make a better impression tomorrow." Snape insisted and closed the door.

"I didn't think that I'd come so late in the year but I got kicked out of my old school last week. Dumbledore scooped me up." Harry smiled. He figured that he'd better start flirting soon or Snape might send him away.

"You were sorted into my house. The fact that you were thrown out of your last school is concerning." Snape's face turned bitter.

"I came to this school to start fresh because at my old school I had a relationship with a teacher. But you can't tell anyone...it's our secret, right Professor?" Harry didn't expect Snape to buy it but at least he tried.

"I see. Well..." Harry watched as Snape began to stutter. He enjoyed it, Harry knew that Snape was a collected and dignified man but at this second he was searching for words.

"I've said too much haven't I? Well..." Harry leaned forward so that his Professor could see his clivage.

"Indeed. Do you want some tea you look very cold?" Snape could see Harry's nipples poking out through his shirt. Snape was a man after all and men were drawn to the female fesique.

"I'd love some Professor." Snape left the room. Harry could have jumped for joy. He had Snape drooling over him, a thing he had never thought could happen.

Snape came back shortly after with two cups of tea on saucers. He placed both cups on the table and sat down.

"Sir, this might be asking for too much but could you get me a blanket? It's so cold." Harry made sure to flash his breasts as he reached for his drink.

"Not at all..." Snape poped out of the room and Harry sprung into action. He threw off the lid of the infaction potion and poured it all in. There was a slight puff of pink smoke as the fluids mixed but it thankfully subsided before Snape came back.

"Here." Snape handed Harry the blanket and sat down again. Harry watched with anticipation as Snape drank from the cup.

"Thanks. The tea is good...mnn." Harry remembered seeing numerous women in Dudley's magazines who sit in awkward positions to attract males so he tried one out. He bent his legs on the chair and parted them slightly. As a finishing touch he drapped a hand over his crotch.

"Yes it is..." Snape took another mouth full as he kept his eyes on Harry.

"Are you okay Professor? You're staring..." Snape turned his head quickly with embarrassment.

"I just...it's just..." Harry began to laugh at his Professor's helplessness. It was cute to see apposed to his usual stiff upper lip.

"I know. Most males find me hard to resist. I think it's the breasts...or it could be my arse...my curves or even my face." Snape dropped his tea, the cup smashed and the little reamins of tea splashed out onto the floor.

"I don't know if I can help myself..." Snape looked desperate. He remained in his seat, it seemed as though he had some self control.

"Come. And. Get. It." Harry had only dreamed of this moment. He was ready for his Professor.

"It'll be our little secret."