Author's Note: I'm sure I saw a prompt on Tumblr for something akin to this, but I can't for the life of me find it!

First attempt at Sanvers, enjoy and please review :)

Maggie walked towards the DEO building with a spring in her step. She was on her way to take Alex out for lunch as she did every Wednesday. She thought about how amazing the last six months had been, after she had finally plucked up the courage to seek Alex out at her apartment. We should kiss the girls we want to kiss. She chuckled to herself; she should get that printed on a mug or something.

She wandered into the lobby and nodded at the agent who walked passed her, she stood idly for a few moments with her hands in her pockets, before looking at her watch, Alex was never late. She looked around the room, but there was no sign of her girlfriend. Maggie saw Agent Mathews heading her way and started to walk across the large space to meet him.

'Hey, have you seen Danvers about? She was supposed to meet me nearly ten minutes ago.' Maggie quizzed him.

'She's probably still in the Green Room, I saw her heading there for a sparring session with Supergirl, she's probably lost track of time, you know how those two get…' Agent Matthews replied with a grin, shaking his head. 'Go down that long corridor' he pointed, 'take a right at the end and then it's the third door on the left' he explained after noticing Maggie's confused expression.

'Thanks, see you around Matthews!' Maggie called as he retreated into another room off the lobby, waving behind him as he went. Maggie then headed in the direction she had been pointed towards, she was quite excited to finally enter the Green Room, Alex had told her about it, but Maggie felt it just couldn't compare to actually seeing the room. She also realised this would mean seeing Alex spar with Supergirl, the thought made her speed up her pace. She chuckled at what Agent Matthews had said; she was totally aware of what Alex and Supergirl were like together, after all they are sisters. It hadn't taken Maggie long to realise that there was more to Kara than meets the eye, although Kara had attempted some very bizarre cover up stories. Maggie had let them run their course, getting exceedingly amused at the lengths Kara would go to, to hide her identity. Maggie's favourite had to be the time she caught Kara lifting Alex's motorcycle with one hand so that Alex could change the tyre, she had tried to convince Maggie her superhuman strength was down to 'lots of calcium, good diet and plenty of exercise.' Alex had finally taken pity on her sister and explained that she was fooling no one, Maggie was a detective, and it was her job to detect… Kara had finally given up at that point and had resigned herself to the fact her cover was blown with the detective.

Maggie entered the Green Room, unsure of what to expect, and was slightly dazed by the soft green light that the room emitted. Maggie found an empty spot in a corner and leant up against the wall, watching as Alex and Kara engaged in hand to hand combat in the centre of the room. Both were completely unaware of the intruder, caught up in their training exercise and Maggie took the opportunity to check out her girlfriend.

Maggie had never really understood the looks of adoration her previous girlfriends had given her, as a cop she was required to be physically fit, meaning she was toned in all the right places, but watching Alex, it was like for the first time she felt like she understood… Alex was stunning. Her muscles rippled as she blocked a blow from Kara before swinging her own, sweat dripping down her back as she did so, Maggie felt a twinge of arousal in her stomach.

There was something extraordinary about watching Alex spar on equal footing with Supergirl, Maggie knew it was obviously due to the kryptonite dampening Kara's powers, but she couldn't help but feel in awe of her girlfriend's fighting abilities.

Alex swept her leg round in a move Kara wasn't expecting, which resulted in the Kryptonian ending flat on her back, Kara quickly sprung back to her feet and spotted Maggie out of the corner of her eye. She saw how she was watching Alex with what could only be described as a look of pure lust. Kara started to formulate a plan… while dodging punches from Alex.

Alex could tell something was distracting her sister and took the opportunity to grab her arm and twist it under, so Kara was pulled against her and immobilised. Kara knew exactly what was coming next and braced herself as Alex leant forwards, rolling Kara over her shoulder and onto the floor in front of her. Kara swore she heard Maggie gasp.

'Alex, what time is it? Maggie is here…' Kara questioned from the floor, looking up at Alex.

'Dang, it must be past one…' Alex said while offering out her arm to help pull Kara to her feet. She turned to look at her girlfriend apologetically, and was greeted by Maggie smirking at her.

'Oh, don't mind me, you guys finish up' Maggie yelled from her spot in the corner.

'I think she's rather enjoying the show…' Kara whispered in Alex's ear, causing her sister to blush. 'Go grab a drink, I have an idea…'

Alex wandered over to her water bottle and wondered what her sister had planned, she drained half of her water in three large gulps and headed over to Maggie, running her fingers through her sweat damp hair.

'I'm so sorry' Alex said when she was within hearing range, 'we lost track of time, we don't actually get to spar in here that much and we couldn't pass up the opportunity…'

'It's fine' Maggie smiled back, 'this is so much better than the sandwich place I was taking you for lunch. You're incredible Alex, I knew you could fight, but that was just unbelievable… and kinda sexy…' Maggie added as an afterthought, her eyes darkening.

'If I had known it would have this effect of you, I'd had brought you here sooner!' Alex blushed for the second time.

'Alex!' Kara called from across the room, 'there's a final exercise I want to try.'

'OK!' Alex yelled back, she turned back to Maggie and leaned in to give her a quick kiss, brushing their lips together, 'I'll be done soon, do we still have time to hit the sandwich place after? I'm starving!'

'I'm sure we do' Maggie laughed.

Alex turned and headed apprehensively towards Kara, wondering what her sister had planned.

Maggie watched as Kara just grinned at Alex, bouncing on the balls of her feet. She could never wrap her head round the fact that her girlfriend's dorky little sister was the 'girl of steel'; her two personas seemed to simultaneously complement and contradict one another other.

'What are you up to?' Alex questioned Kara as she took up a defensive position, arms up and fists locked.

'Making you look good! Why do you think I was letting you win earlier?' Kara replied with a grin.

Alex playfully hit Kara on the shoulder, 'I don't need any help looking good and you soooo did not let me win…'

'Look, I'm just trying to help my sister out, Maggie looks like she wants to drag you home right now… I just don't need any details, OK?' Kara pulled a face at the thought.

Alex just raised an eyebrow in response.

'So what is it you want to do?' Alex finally questioned.

'I want to race you up the salmon ladder!' Kara looked gleeful at her idea.

Alex had to laugh, it hadn't been what she was expecting, but she had seen the looks Maggie was throwing her way…maybe Kara was on to something.

'Fine' Alex relented, 'let me just take of my top, it's sticking to me.' She pulled off the top that was drenched with sweat, leaving her in just her sports bra and trousers.

Maggie groaned when Alex pulled off her top, Danvers knew she had a weakness for her abs. Get a grip! She thought to herself, you're drooling over your girlfriend like a school girl with a crush!

Alex jogged to meet Kara over at the double salmon ladder, and took her place next to her sister. With a simple nod, they both jumped to grab onto the bar and started their assent. The sight of Kara in her Supergirl suit, cape flying behind her was something to behold, but Maggie could not take her eyes off of Alex. Her abs rippled every time she jumped the bar up a rung, her arms quivered with every thrust upwards. Maggie watched as a drip of sweat made its way from the sports bra Alex was wearing, slowly making its decent to run across her abs. The only coherent thought Maggie could muster was that she really wanted to be running her tongue across those abs…

Had Kara had the use of her super speed, there was no doubt she would have beaten Alex to the top, but Alex had been training with standard human strength for much longer. Alex reached the top a couple of seconds before her sister and paused to look down at Maggie. Her girlfriend seemed to be lost in a dream like state, lust flushing her face. Alex grinned and decided to buy some pot stickers for Kara as a thank you. Deciding to show off some more, Alex swung backwards and forwards a few times to gain momentum, releasing in a forward swing, somersaulted, and landed on the ground. She sauntered over to where Maggie was standing, mouth slightly agape and pulled her in for a kiss.

'Let's get out of here' Alex whispered 'I could do with heading home for a shower…' she spoke into Maggie's ear, her breath creating goosebumps across the detective's body. All Alex heard in response was a moan she took to mean 'yes.'

Maggie took Alex by the hand and headed towards the door, 'we'll see you later Kara' she managed to squeak out as she went past the Kryptonian.

Kara laughed and started to gather up her belongings and the bits Alex had left behind. 'If only I could convince Lena to come watch me train' she thought…