A.N. / My two favourite type of au's combined into one fake dating hogwarts AU. Even better it features Supercorp/Karlena. (Also cross-posted on Ao3)

My Beta's did a good job :)

Kara Danvers loved Hogwarts, she loved everything about the enchanted building.

During her first year she had done a lot of exploring and sneaking out, much to the chagrin of her sister Alex. Being a year older, Alex looked out for her baby sister; which was incredibly hard to do when danger followed Kara around. The younger Hufflepuff couldn't stop herself from helping people and according to Alex, that was her best and worst trait. Inevitably Kara fell into Hufflepuff, and it definitely helped that the common room was next to the kitchens; a place where Kara spent a lot of her time (and the house elves took a real shine to her).

Kara wasn't the biggest fan of theory work, but she gave everything a good go. Being a Hufflepuff was all about hard work and encouraging others, something Kara tried to do daily. She was known for being kind to everyone.

Which was what started this whole predicament.

Kara walked down the hallway wearing her favourite Chudley Canon's sweater, a white collared polo shirt paired with simple black skirt.

Every Saturday afternoon, Kara would meet up with Alex and their friends to play their favourite games. She was more than prepared to whip everyone's asses at another rousing game of Exploding Snap! A wide grin spread across her face as she thought about the week before when her best friend Winn almost burst into tears after she'd beat him. She may have been a Hufflepuff, but she was still fiercely competitive.

She was so lost in thought that she didn't notice someone else walking round the corner. Only noticing when she ran straight into him.

"Rao!" Her exclamation was met with a grunt. Her eyes drifted up and her face fell instantly recognising who the body belonged to. She quickly plastered on a smile as she spoke. "Oh golly Mon-El, I didn't see you there,"

The boy flashed her one of his overly charming smiles before responding. His voice oozed charm and seduction, something that most girls found alluring but Kara found uncomfortable.

"That's okay, Kara. I was actually hoping to run into you," He said.

"Well you found me!" The smile she'd faked turned sour, as she tried to keep the disdain out of her tone. "Was there something you needed?"

"I know you said that you were busy, but I wanted to ask again just to make sure," His smile widening as he spoke. This time Kara couldn't hold back her sigh, yet he seemed undeterred continuing his attempt to woo her, "Would you like to accompany me to Hogsmeade?"

"Mon-El, I already told you that I have plans." She told him ducking her head down. "I'm sorry."

He brushed off her apology and carried on. "Come on Kara, you know we'd be perfect mates if you just gave me a chance, after all I am a boy and you are a girl can I make it any more obvious?"

"That's not how it works Mon-El." Kara angrily exhaled, "Biology isn't everything, just because we're of the opposite sex it doesn't mean that we should become a couple or mate. I really do have plans!" Kara tried to explain. She tries to sidestep him, but he is already one step ahead, using his hand against the wall and effectively block her path whilst he eagerly tries again.

"No, no my words are not translating well. Kara, I want to be with you and you must feel the way I do," he told her intensely holding her gaze.

Kara tries to subtly push away, but with no luck. Barely able to hold in her scoff as he edges closer. "Mon-"

Her words cut off when she felt his hand cupping her cheek and his breath against her lips, as he started to lean in. Before she can even protest, Mon-El yelped and was jerked back as a figure approached them. Kara jumped back putting distance between her and Mon-El. She adjusted her glasses, widening her eyes comically, watching as none other than Lena Luthor moved to stand beside her. The Slytherin girl in Kara's year; sister to the mass murderer and torturer Lex Luthor. The rumours' never stopped about who exactly Lena Luthor was, or whether she could become the next Lex Luthor in training.

Lena shared most of her classes with Kara and the other Hufflepuffs, but she was often seen alone. Kara had made an effort to wave at the girl and flash her a smile every chance she got. She got wary smiles in return, but that didn't matter. Kara knew enough about the girl to know she was a good person; that and she happened to harbour a small crush on her... but it was only a small one.

Kara watched as the ebony beauty stood, chin raised, eyes dazzling as she stared down the boy. It was only then, that she realised Lena's wand was drawn.

"May I ask what you think you were doing?" Her tone was sharp and the power it held was beautifully unnerving.

"I was just-" The boy was instantly cut off with a scoff.

"No, you were touching Kara without her permission," Lena accused.

"No I-" With practised ease Lena moved her hand to silence him before continuing.

"I'm sure I must be mistaken, surely you wouldn't have the sheer stupidity to touch my girlfriend in such a manner, would you?" Kara's face must have been quite a sight because a perfectly manicured hand gently touched her arm. Out of the corner of her eye she caught Lena looking at her with a concerned frown; her eyes seeping into Kara's soul and managing to convey that she should play along with a simple nudge of her head. The sunshine smile quickly found its way back onto Kara's lips and she leaned into Lena's embrace. Both looking forward to face a rather confused looking Mon-El.

He glanced between the two, pointing his hand accusingly. "Wait, you two? You- you two are together?"

Lena smiled in acknowledgement, her hand softly running up and down Kara's forearm in a soothing motion. If she noticed the goosebumps there she didn't say anything. Mon-El folded his arms as he gave the two a pointed stare.

"I don't believe you. You must be lying! Kara told me that she was single, we were just planning a date" Kara shook her head at his words, about to retort but Lena beat her to the punchline.

"I can assure you Emon-Lee, I'm not lying" Lena began.

"It's Mon-El" he corrected sassily flipping his cloak.

"Anyway," Lena continued, "We've been keeping our relationship quiet until she was ready to tell her sister, Alex. We've been very discreet and we were supposed to be meeting for a date, one that you have quite rudely delayed. Now, if you don't mind, I would like to take my girlfriend for that hot chocolate I owe her"

Lena placed the hand that was previously on Kara's arm, on the small of her back, she attempts to usher Kara to safety. Only to roll her eyes when she found they were blocked yet again.

"If Kara's really your girlfriend then how come she was going to kiss me?" Lena's mouth fell open about to fire back a response.

Kara didn't know if it was the smug expression or the way Lena moved to stand protectively in front of her that did it but before she could stop herself, she spun Lena around and cupped her hands against her face, crushing their lips together.

The second her lips meet Lena's, she felt a spark. Their lips moved in sync, and Kara found herself lost in the taste of the other girl.

Lena's lips were so much softer than Kara ever imagined. The way Lena softly nibbled on her lower lip, their embrace deepening and causing a fire to erupt within her. Her hands flew up, tangling in Lena's silky locks, as she deepened the kiss. Kara shuddered when Lena's hand moved from her back to wrap around her neck.

After a few more minutes of passion, Lena pulled back, licking her lips as they gathered themselves.

It took Kara a minute to realise her surroundings.A violent blush spread across her cheeks as she ducked her head finally letting her hands drop from Lena's face. Lena only smirked when Kara stutters and instantly flushed more. She felt more victorious after she noticed Mon-El had left; though how long ago, she was unsure. Her smirk only grew wider as Kara began talking at full speed, frantically waving her hands about as she tried to come up with a good explanation.

"Oh my gosh, Lena I'm so sorry! I-I just don't know what came over me. He was- and I just- oh my gosh I'm so embarrassed..." As Kara trailed off burying her face in her hands. She wished for the ground to swallow her whole.

Lena tried and failed to hide the adoring smile she gave the embarrassed girl. She bit her lip before stepping forward, gently moving Kara's hands away from her face. Her fingers lingered for a few moments, before she collected herself, fixing the still blushing girl with a direct stare.

"You have nothing to be embarrassed about Kara. I didn't give you much of a choice. If anything I should be apologising to you," Lena said nervously.

Once again Kara's eyes widened as she instantly shook her head. "Golly no! Lena; you saved me from Mon-El's advances. He's been pursuing me for weeks!"

Lena's smile brightened as she gave Kara a flirty wink. "Well, then I'm happy to help you"

Kara smiled bashfully. Her face falling moments later, moving away from Lena's touch as she began to speak to Lena's disappointment.

"Rao, I really do have to go." Kara frowned. "I was meant to meet Alex, darn it! She's going to be so mad- she hates it when I make her wait!"

"I'll let you go then,"

With one last smile, Kara set off, skipping down the corridor, waving at Lena before she disappeared around the corner. A content smile playing on both of their lips as they thought about what had just happened.