Author's note: This is my first Clexa fic. Rated M for a reason. It's gonna be pretty smut-filled.

The taxi pulled up to the Griffin house around 5pm. Clarke, exhausted and nearly delirious from the stress of finals, paid the driver, grabbed her bags and dragged them up to the front door. Part of her just wanted to leave them on the porch. The thought of lugging them upstairs to her room was too difficult for her to wrap her head around.

She paused for a minute to prepare for the bombardment of questions from her mom. That's when she heard the front door slam at the house next to hers. She looked over and saw a girl about her age carrying a workout bag and a soccer ball and tossing them into a car. She was in baggy sweats and a hoodie with the hood pulled up over her head. Clarke didn't have the best view of her, but couldn't pull her eyes away. As if sensing she was being watched, the girl looked up at Clarke. She gave her a quick nod before getting into her car and driving off.

Clarke nodded back, but it was way too late before she even registered the girl had acknowledged her. She smiled at her own foolishness and opened the front door.

"Mom?" She swung the front door open and immediately felt at home with the smell of pancakes hitting her nose.

"Clarke?" Abby Griffin appeared from the kitchen holding a spatula. "You're home!"

She wrapped her daughter in a hug and helped bring her bags inside the house.

"Breakfast for dinner?" Clarke asked excitedly.

"You're favorite," confirmed Abby, as she headed back into the kitchen to flip the last pancake. "I know you're probably tired. So we'll have a quick dinner and I'll only grill you for a few minutes before you can get settled in. We do have all summer to catch up, after all. When I'm not at the hospital, that is."

Clarke nodded and went through her bags trying to find her phone.

"Have you talked to Raven yet? I know she was looking forward to seeing you." Abby was just finishing adding the syrup to the pancakes.

"Not yet. I'll text her tomorrow. When Octavia gets back, we'll probably all go out. Tonight, I just need sleep."

Clarke sat down as Abby placed the pancakes on the table. She immediately shoved as much as she could into her mouth. She had forgotten to eat this morning and was just now reminded of how much she loved her mom's pancakes.

"So, anything new and exciting going on around here," asked Clarke, with her mouth full.

"Simply stunning, Clarke." Her mom had to laugh at how ill-mannered her child was being.

"What?" Clarke shoved even more in her mouth. "I wath juth athking a questhion."

Abby laughed. "No, not much since Christmas. We got new neighbors, though. I've said hi a few times. They seem nice, but they kind of keep to themselves for the most part and they don't seem to be home too often. I think they have a daughter around your age. Or someone visiting. I only just saw her last week."

"Yeah, I think I saw her when I got here." Clarke wiped her mouth with the back of her hand and got up. "Thanks for dinner, mom. I'm in desperate need of a forty-hour nap." She gave her mom a kiss on the cheek. "Good night."

Abby sighed and muttered to herself. "No, that's fine. I'll clean up. And don't worry about that napkin next to your plate. Yeah, just use the back of your hand like a barbarian."

A slamming door jolted Clarke awake. She looked at her phone: 6am. Who the hell would dare wake her up at 6am? She got out of bed and walked to her window. She craned her neck and spotted the same girl from yesterday stretching on her porch. Clarke watched as she moved from one side to the other, loosening the muscles in her legs. After a few minutes, she took off running down the street in her baggy sweats and light gray hoodie. Clarke inhaled deeply, annoyed by the girl who woke her up, yet simultaneously curious about her.

The next morning Clarke was awoken the exact same way at the exact same time. She threw the covers off her bed and stormed toward the window. She wanted to throw it open and yell at the girl below, but instead, she just watched her once again. This time, she was wearing tight black leggings and a white tank top. The sun wasn't fully up yet, so it was a little dark, but Clarke was able to see more of the girl than she had before. Her arms were toned and those leggings fit her perfectly. Clarke swallowed as she watched the girl stretch and pick out a song on her iPod. Then, she clipped the iPod onto her workout pants and took off running once again.

Clarke watched until the girl was no longer in sight, then climbed back into bed. Unfortunately, sleep never found her. She spent the rest of the morning thinking about her mysterious new neighbor.

Her alarm squealed in her ear at 5:45am the next morning. She slammed her hand down and lay back down, seriously contemplating going back to sleep. But her curiosity outweighed her laziness and she was up and dressed to go running within five minutes.

She paced downstairs by her front door for a few minutes until it was 5:59am. Then she opened the door and slowly walked out. She looked around for the girl, but saw no sign of her. So she started to stretch. Or at least she pretended to. She hadn't worked out in ages and her idea of a stretch was trying to hang a painting or reaching for something on a top shelf. She didn't always have time to work out during the school year. Not that she really needed it. She was proud of her body and knew she was in decent enough shape. But for some reason, she suddenly had the urge to take up running. Hmm…weird.

When the door to the house next door slammed shut, Clarke looked over and saw the girl. This time, she was in blue running shorts and a long sleeve dark green shirt.

Clarke panicked slightly. She had not thought this through. What was she supposed to do? Go up to her and say 'Hi. You run. I run. We run together, yes?'

Shit. Shit. Shit. Clarke was starting to regret this. What did she think would happen? The girl's eyes caught Clarke's and they stared at each other for a moment. Clarke was paralyzed. 'Say something, Griffin. Say something! Anything! Words!'

There was nothing but silence. And Clarke wanted to die. The girl watched her carefully for a few more moments, looking her up and down. She then stepped off the porch and nodded at Clarke, signaling her to join her. Clarke nodded back and they both started jogging down the street.

Clarke was proud of herself. She managed to keep the pace with the brunette. At least for the first five minutes. That's around when her body started betraying her. She fell behind a bit and could tell the girl slowed her pace way down just for Clarke. She pumped her legs as hard as she could to catch up. She didn't want the girl to change her routine just for her.

They still hadn't spoken a word to each other. The only noise either of them could hear was Clarke's heavy breathing and coughing. She watched as the brunette looked over her shoulder behind her and gave her a small smile, shook her head and slowed down a bit more so Clarke could catch up.

By the time they came back to their block, Clarke's lungs were burning. Her legs were on fire and she wanted to collapse. Once they reached Clarke's house, the other girl slowed her pace down to a walk and turned to Clarke.

"This is where I leave you. I have another four miles to go. You should probably take a rest." She gave Clarke a little smirk before she slowly started jogging backwards. "Thanks for the company. I'm Lexa, by the way."

Before Clarke could respond, Lexa was off and running again. Even if she wanted to respond, she couldn't. She was hacking up too much mucus and saliva to even be able to speak. She closed her eyes and dropped her head thinking this was probably the least sexy thing Lexa had ever seen.

Clarke spent the rest of the day reliving her humiliation from the comfort of her bedroom. She texted back and forth with Raven to try to get her mind off of it, but it really didn't help much.

The next morning, Clarke was up again at 5:45am. But this time, she just lay in her bed until she heard the door slamming. At that, she got up and went to the window to watch Lexa do her pre-running stretched. She noticed Lexa looking around a bit and Clarke wondered if maybe she was looking for her. She watched as Lexa took a little longer than usual to stretch before she finally took off. Clarke almost regretted not going, but she couldn't risk the defeat she experienced yesterday.

Clarke spent the rest of the morning unpacking. It was weird being in her childhood bedroom again, but she liked that it still smelled the same. Like old paint and vanilla. Her sophomore year at NYU proved to be way more stressful than her freshman year and she was glad for the break. Plus, she missed her friends and couldn't wait to see them again.

It was around 8:30am when Clarke heard her neighbor's front door close. She figured Lexa must be back from her run. She looked out her window and noticed a figure appearing in the upstairs window next door. It only took a moment to realize it was the brunette. Clarke hadn't realized her window looked directly into Lexa's. She had only watched the girl coming out of her front door. Clarke stepped back, debating on going back to unpacking. Instead, she moved closer to the window and watched as Lexa came into full view.

Clarke felt her heart rate speed up as she watched the brunette remove her sweaty workout shirt to reveal her insanely toned abs glistening with sweat. Her sports bra still hugged her chest, making Clarke feel a little less creepy. Still, there was no way she could justify watching her neighbor. But for some reason she simply couldn't look away. She swallowed hard as Lexa then removed her pants and threw them, basketball-style, into her laundry basket, fist-pumping after they landed perfectly in the basket. Clarke chuckled to herself, then felt her breath hitch as she realized how cute Lexa looked in just boyshorts and a sports bra. When Lexa fully had her back to her, Clarke took notice of an intricate tattoo on her back peeking out of the sports bra.

She could feel herself getting warmer, her face flush as she her breathing became more erratic. She didn't know if it was the fact that she was watching the other girl or the fact that she could easily get caught. All it took was Lexa to realize their windows were right across from each other. Clarke wasn't exactly making herself hidden.

The blonde was practically licking the window once she saw what Lexa did next. She watched as the brunette started doing pull ups on the bar attached to her bedroom door. Her face grew hotter as she watched the girl's muscles flexing with each pull up.

Clarke finally pulled her eyes away from the scene. 'Get it together, Griffin! This is sick.'

She chastised herself and started to move away, but not before peeking one last time. Now, Lexa was on the floor, doing stretches Clarke didn't even know was possible. How could one person be so limber? She continued watching until Lexa was done stretching and went to her closet to grab a towel and tossed it on the bed. She then went to remove her sports bra, slowly pulling it up over her head.

Clarke gasped and immediately turned away. The guilt she felt plagued her. She shook her head, truly disappointed in herself. What the hell was wrong with her?

She decided that now would be the best time for a shower.

The next morning, Lexa woke up in the exact same fashion she did every morning since she got back home for the summer. Just because it was summer break didn't mean she could slack off on her training. At 5:30, she woke up, ate some oatmeal with strawberries, then got ready for her morning run.

This morning was a little different, though. This morning, she moved just a little bit slower. Like she did yesterday. She didn't know why, but yesterday she had hoped the blonde girl from next door would join her on her run again. Granted, it was a disaster the first time. The girl had slowed her down tremendously and while she hated losing time on her run, she couldn't bring herself to leave the blonde behind. She thought it was kind of adorable that she wanted to run with her. Also...a little weird. But she overlooked that part. Mainly because the girl was gorgeous. And she wasn't one to deny a gorgeous woman.

She made her way out the front door and started stretching. She looked toward the front door of her neighbor's house. She understood why the blonde didn't come yesterday. She figured half of it was a pride thing and the other half was a need to physically recover. But this morning, she was disappointed yet again to see the blonde still hadn't made an appearance.

For some reason, she couldn't stop thinking about her. From the moment she saw her pull up in the taxi, she knew she was in trouble. And after they went running together, it only made things worse. She started to grow frustrated. Her constant training for soccer, combined with classes left her very little time for relationships. Which means she often had to rely on one night stands to fill her needs, but they never quite left her feeling satisfied. Probably because she was never with anyone long enough for them to really know how her body works and what she likes. So she decided to use this summer to solely focus on training. No distractions.

Well, that was now shot to shit because the other girl certainly stirred something in her and she hated it. But she also loved it. After fifteen minutes of stretching - ten minutes more than she normally does - she gave up on the blonde and started her run. She was only five minutes in when she heard the heavy breathing and wheezing behind her. She smiled to herself when she realized it was the other girl trying to catch up to her.

She looked over her shoulder. "Good morning. Back for more torture?"

"I live for torture," the girl replied.

If only she knew how much she tortured Lexa. The brunette felt a wet heat at her center upon hearing her response. She increased her pace, trying to get her mind off of what this girl was doing to her body.

"Wait up!"

"Come on, blondie!"

"Clarke."

"Excuse me?"

"My name is Clarke. Clarke Griffin."

Lexa committed that name to her memory and gave a little smirk to Clarke.

"Well, you're slowing me down, Griffin. I can't have a repeat of the other morning. My time was pathetic."

"I'm not the best runner," wheezed Clarke.

"I can see that. But you're young and mobile. No excuses."

"Well, we can't all have abs for days and a perfectly toned and tattooed back."

Lexa slowed her pace and looked at Clarke. "How do you know I have a tattoo?"

She could see the other girl turn white and couldn't tell if it was because of the running or because of what she had just said.

"Umm, you were wearing a tank top the other day. I saw you as you were coming in from your run. I thought I saw part of a tattoo."

Lexa didn't say anything. She just nodded. Interesting. She didn't recall seeing Clarke after her run, but then again, she gets pretty focused when she works out.

She pulled ahead of Clarke and couldn't see the tint of red on the other girl's face.

She realized she was leaving Clarke behind again, so slowed her pace once more to match hers.

"So, you're home for the summer, too?"

"Yeah," replied Clarke. "I'm an art student at NYU."

"Impressive. I'm afraid I have zero artistic ability. But I respect those that do."

"What about you?"

"I go to Columbia. Soccer scholarship. Starting as captain junior year in the fall."

Clarke nodded. "Even more impressive."

"My parents just moved here while I was at school. It's weird coming home to a place that was never really your home. But I'm making the most of it." She looked over and smiled at Clarke. "Can't say I mind it all that much."

Lexa took Clarke's blushing as a sign that her little flirtatious line wasn't completely unwanted. But she mentally berated herself for flirting. This was her neighbor. A girl she just met. A girl who probably didn't need her drooling all over her. A girl who looked insanely hot while running...particularly due to her ample chest, which just so happened to bounce perfectly with every step.

Lexa tried not to stare, but it was difficult. That's why she tried to stay just a little bit ahead of Clarke at all times. However at this moment, Clarke managed to catch up with her as their arms brushed against each other.

"So, I guess we're close to each other."

"What?" Lexa didn't know if she heard right.

"We're close. NYU and Columbia. It'll be nice to know someone else in New York."

Lexa laughed nervously. "Oh...yeah. I guess so."

The rest of the run was pretty quiet, but neither girl minded. When they arrived back on their street, Lexa gave Clarke a quick goodbye and ran into her house. She felt bad for leaving the girl, but she needed to take a cold shower very quickly.

After her shower, Lexa emerged from her bathroom wearing boxers and a tank top. She was cleaner and certainly colder, but no less turned on than she was before. She thought about taking care of herself in the shower, but refused to be reduced to such a horny college girl cliche. She would simply have to get her mind off of Clarke by any means necessary. Mind over matter. Mind over matter. She just had to keep repeating those words.

Her bedroom felt stifling, so she went to open her window. She struggled a minute to get it open and once it was open, she heard music blasting from across the way. She looked over to see Clarke dancing around her bedroom in just her bra and underwear. Lexa instantly felt a wetness pooling between her legs. This wasn't happening. Nope. It wasn't happening. The hot girl next door was not dancing around in her underwear right in plain sight of Lexa. The universe couldn't possibly be this cruel.

Lexa watched just a bit longer, enjoying Clarke's goofy dancing. As sexy as she found the girl, there was also something really charming and adorable about her. Her silly moves made Lexa laugh. And now, she felt like a predator watching the blonde like this. So she decided to go downstairs and make an omelet for herself.

Twenty minutes. That's how long it took her to cook and eat her omelet. She lingered in the kitchen a bit and took in the emptiness of the big house. Her parents were rarely ever home, so she was used to the silence. Unfortunately, with no one else in the house to distract her, it made it difficult to try to get a certain blonde off her mind.

She figured she had banished herself from her room long enough and went back upstairs to watch some Netflix on her computer. She chanced a glance over to Clarke's room and didn't see her anymore. The music wasn't playing anymore, either. With a sigh of relief, Lexa fell to her bed and screamed out a bit of frustration into her pillow. Then, she grabbed her laptop and before opening, cast one more look over to Clarke's window. This time, the girl was there. Still in her bra and underwear. Lexa could see she was sorting through clothes that were on her bed. The brunette got up from her bed and moved closer to the window. She watched as Clarke held up a shirt to her chest and put it back down.

The blonde then started to unclasp her bra and Lexa froze. She wanted to move. She tried to move. She tried to close her eyes, but she couldn't. She stared wide-eyed as Clarke removed her bra, freeing her perfect breasts. And in that moment, Lexa knew she was going to hell. And she deserved it. Hell was a place for someone like her. Someone with no self-control. With no decency. With no regard for someone else's privacy. Especially someone as cool and sweet as Clarke Griffin. She knew all this, yet Clarke's breasts were hypnotizing her, daring her to keep looking. So she did. It wasn't her fault. The boobs had spoken. And Lexa had always been a boob girl.

At this point, her underwear was already ruined and she regretted not taking care of herself earlier in the shower. Her breathing was heavy and her conscience was scolding her, but she had already made her choice. She was going to look. There was no going back now. May God have mercy on her soul.

Clarke's hands moved down to remove her underwear and Lexa could swear all the air had been sucked out of her lungs and the room and the entire atmosphere. As Clarke's fingers pulled down the lace garment, Lexa covered her eyes. She couldn't do this.

At that moment, Lexa's phone went off, scaring the shit out of her. She ducked down from the window onto the floor with a thud and Army-crawled over to her phone.

"Hello," she whispered. "Anya? I can't talk right now. What? I'm not whispering...No I'm not. Okay, fine. I am. But I can't talk now. Bye."

She stayed on the floor with her face in the carpet. She was a bad, bad person and if Anya hadn't called her at that moment, she might very well have opened her eyes again and she would have crossed the line into full-fledged pervert.

After pulling herself up, she resolved to close her curtains and to keep them closed for the remainder of the summer. It was the only logical thing to do. Plus, it was the right thing to do. Clarke didn't deserve some sexually frustrated stranger ogling her body. She grabbed one side of the curtains to close them, but not before her eyes, which apparently didn't have the conscience her brain had, glanced over into Clarke's room one last time.

That was it. The nail in her coffin. Her eyes should be gouged out and left for the buzzards to feed on. Because in that split second, her eyes caught the most beautiful and sinful sight Lexa had ever seen: Clarke Griffin completely naked and looking right back at Lexa with a rather shocked look in her crystal blue eyes.

All the brunette could do was stare with her mouth wide open, unable to think of a single thing do to or say to explain herself.

Yup, Lexa was a dead woman.