Prompt from gammaxmen: Christmas double date with SuperArrow and Scarlet Canary. I think Oliver and Sara could be friendly dating with Barry and Kara, and I think under a mistletoe, Oliver could be kissing Kara and Barry, Sara.

I didn't get the mistletoe, but I felt pretty good about the rest of this.

"Oh, wow," Kara took another gulp of goodness from her thermos, smacking her lips afterwards. "Oh, that's good." She frowned, taking another look inside. "Actually, this tastes just like the cocoa Ruby got me for Secret Santa . . . "

"That's the wonder of Gideon!" Kara turned around to see Sara poke her head out of the racks of evening dresses they were looking through, the blonde grinning at her. "She knows exactly what you like."

"Huh," Kara blinked, then turned back to the rack she was looking through. "Way to go, Gideon."

"OK, so," Sara walked out, holding up two different hangers. "Red or black?"

"Uh . . . " Kara chewed her lip, tilting her head back and forth, trying to decide. "Wow."

"You do know who you're dating, right?" Both turned to look at the black-haired woman sitting in the chair nearby, a bag of caramel popcorn in her hand. "Trust me," Zari pointed at the dress in Sara's right hand. "Go with the red."

Sara looked at the velvet dress, then nodded. "Red it is, then." She put the black one back on the rack. "Your turn, Kara!"

"Why are we doing this here?" Kara rolled her eyes, but obediently put her thermos down and turned to look through the dresses on her side of the store. "We could've easily done this on the Waverider!"

"Yeah, but actually shopping is fun, too!" Sara called from her dressing room.

"She has a point," Alex chimed in, then looked to the side when there was a ding from her girlfriend's phone. "Business?"

"Actually, I told Ruby that an AI can apparently copy the cocoa she got Kara," Sam answered, chuckling and checking her messages. "She doesn't know how to take that."

Kara sighed, picking one dress she liked and holding it out. "What do you think?"

"Not silver," Sam immediately shook her head. "Not if you're going for velvet."

"Definitely not," Alex agreed.

"Gold is more your color anyway," Zari added.

Kara frowned thoughtfully. "Gold," she mused, looking further down the line of dresses.

"I'm still trying to figure out how we got here," Sara remarked.

"That's easy," Alex smirked. "Earth-X."

Kara ducked her head, blushing, and Sara's laughter came from the dressing room. "Right on point, Danvers!"

"Shut up," Kara groaned.

"From what I've heard, she's right," Sam looked at Kara. "Both with her and Barry, and you and Oliver."

Kara couldn't help but smile. "Yeah. She's right."

After all, it had been Oliver who faced down his Nazi doppelgänger to rescue her from S.T.A.R. Labs and had risked his entire Earth to tell Black Arrow he wasn't giving up Kara just for Kara's heart to be removed and given to her own Nazi doppelgänger: Black Arrow's wife, Overgirl. It had been Oliver who had come to her, concerned for her health after being under the red sun for so long and after she was caught in Overgirl's nuclear meltdown. And it was Oliver who offered his home for her to stay in when she needed to breathe after Mon-El's return from the future. From there, she watched him try and stay strong, for both his son and his city, when he faced betrayal from Rene, Curtis, and Dinah, and when Cayden James launched his attack on the city. And when he needed strength of his own, she stepped up to the challenge, offering what comfort she could give him and his son, William. By the time Kara realized she was in love with Oliver, she had fallen head over heels in love, and found Oliver felt the same way. She had never felt relief like she had when the judge overseeing Oliver's trial cleared him of charges, even though it had been J'onn masquerading as the judge as a last Hail Mary play.

Then Ricardo Diaz had made the mistake of attacking Oliver's apartment and abducting Black Siren, Earth-2's Laurel Lance, after she chose to lie on the stand. It was the last mistake Diaz would ever make.

His actions not only brought J'onn back to Star City with Alex to assist in taking down Diaz, but also Slade Wilson when Kara tracked down the Aussie herself. It had taken both of them to convince Oliver not to turn to the very organization trying to lock him up for being the Green Arrow, but instead to turn to the allies he knew he had. "And you wonder why I still call you kid," had been Slade's words when Oliver suggested going to Samandra Watson.

And they didn't need the FBI at all. Quentin Lance had been saved by the skin of his teeth by Barry Allen, speeding him and Black Siren to safety as Cisco Ramon and Ralph Dibny arrived, followed by Sara Lance leading the Legends on a warpath. By the end of the evening, Diaz's reign had ended, and the man himself died with an arrow to the heart.

Oliver did step down as mayor after Diaz was dead, leaving Quentin the position as mayor. Slade decided to stay in Star City to keep working on tracking leads on his two sons, though Kara suspected it was also to keep an eye on the man he saw as his brother. Black Siren took convincing, but ultimately, she rounded out Oliver's team. The three of them worked flawlessly together the more and more they went out into the field.

That had been the real surprise when Diaz attacked – when Sara raced up to Barry after finding out he saved her father and kissed him fiercely. It turned out that after they worked together during the Earth-X invasion, Barry and Sara had kept in constant contact – Zari had admitted she spied on Sara videocalling Barry in the Waverider jumpship away from prying eyes – which had led to a few dates in Central City. Well, Oliver and Kara were dating and were from two different universes; why couldn't a speedster and a time traveling captain/former assassin do the same thing?

"OK," Sara's voice came back, startling Kara back to the present. "You have good taste, Zari."

"I aim to please," Zari spread her hands smugly.

"Wait," Sam jumped to her feet, walking over to one of the racks Kara was about to reach. "Hold on, Kara. What . . . about . . . " She pulled off one of the dresses as Sara came out of her dressing room, dress over her arm. "This one?" Sam finished, holding it up.

Kara turned to look at it, and she blinked in surprise. "Ooo," Alex sat up, tilting her head. "My girlfriend has good taste, too."

Zari whistled appreciatively as Kara examined the dress. "Yes, she does."

Sara took one look at the dress and burst out laughing. "Are we going Christmas themed or are we going based on our boyfriends' colors?"

Kara blushed, snatching the dress. "Yes."

Sara cackled as Kara left to try on the dress. "I like that answer!"

"Wow," Zari remarked, leaning in the doorway of Sara's office, popping a piece of popcorn into her mouth as she looked at the two men that were taking charge of the Waverider, both dressed to the nines in three-piece suits. "I'm jealous of Kara and Sara."

Oliver looked up from where he was looking over the plans for traveling in the Waverider, raising an eyebrow at the hero. "Thanks."

"If that was actually a compliment," Barry didn't look up from checking the console. "Gideon? Anything we need to know?"

"Captain Lance and Miss Danvers are almost ready," Gideon responded dutifully.

"Wonderful," Barry rubbed his hands together, standing up. "Thank you, Gideon."

"So do we get to know when we're allowed back on?" Zari headed for the door to the cargo bay, still eating.

"Whenever we get back," Oliver answered dryly. "I thought that was obvious."

Zari snorted. "Watch it be over a year."

"Gideon," Sara's voice called, and Barry looked up, only for his jaw to drop as his girlfriend entered, finishing with her earrings. "Make sure that's not how long it'll be when we get back."

"Yes, Captain," Gideon answered; she sounded amused, probably because Barry was doing an impression of a gaping fish.

Oliver smirked in amusement as well, walking over. "You OK, Barry?"

"Sabretooth got your tongue?" Sara joked.

Barry cleared his throat, blinking rapidly, then shook his head. "I'm fine," he told them, looking Sara up and down. "You look . . . incredible."

"Well, you said formal," Sara held out her arms, showing off the off the shoulder dark red velvet dress she was wearing, an elegant silver jeweled clasp on her side, her hair tied back in a braided bun, pinned in place with jeweled combs. "So I went formal." She playfully smacked Barry on the cheek. "Keep up."

"Keeping up," Barry rubbed his face, grimacing as Zari snickered.

"How did he react?" Kara's voice came from down the hall, Zari sticking her head down to see what she looked like.

"The usual," Sara snickered, turning around.

"Of course," Kara walked onto the bridge, Oliver's eyes widening as he took in her dark green velvet dress with one cape sleeve, the neckline embroidered with gold stitched flowers, her hair wrapped around her head in a double braid crown. "And me?" she asked timidly.

"Beautiful," Oliver said instantly, walking around the console to meet her. "Absolutely beautiful."

Kara blushed, fiddling with the sleeve of her dress. "Sam picked it out."

"I helped pick Sara's!" Zari called helpfully.

Sara spun on her heel and glared at her. "Get out of here!"

Zari held up her hands in surrender. "Yes, captain."

Kara giggled, turning around to the others as Zari left. "So," she smiled, fidgeting in excitement, "where are we going?"

"Or when are we going?" Sara added as Barry headed to the captain's chair. "And I'm guessing I'm not allowed to drive."

"Nope," Barry shook his head, plopping down. "So don't let me screw up, please, Gideon."

"I will attempt not to let that happen, Mr. Allen," Gideon answered.

Oliver shook his head fondly, smiling as he helped Kara sit down. "It's a surprise."

"Of course," Sara huffed, though she was smiling as she sat down on Barry's other side. "So we can't know."

"I'm pretty sure that's the definition of surprise," Oliver smirked.

"Shut up, Ollie."

"Gideon," Barry smirked, listening to his girlfriend and her ex bicker behind him. "Let's get going before your captain and the Green Arrow kill each other."

"I agree, Mr. Allen."

"So all we have is that it'll be cold," Sara remarked, frowning even as she slipped on a white fur-trimmed coat on over her dress.

"Just a little," Barry grinned, putting his own on as he left the captain's chair.

"And we still don't know where we are," Kara complained.

Oliver just laughed, holding his arm out for her. "It's for us to know and you to discover."

"Fine," Sara rolled her eyes. "Let's discover where we are."

Oliver and Kara were the first down the ramp, and Kara's smile lit up her face as she pulled up the hem of her dress so she wouldn't drag it through what was on the ground. "Hint one: there's snow."

Barry snorted loudly as Sara smiled. "It's a double date on Christmas. We wouldn't go somewhere without snow."

"I'm glad we celebrated my birthday earlier," Sara remarked as they walked down the path, snow lightly falling from the darkening sky. "It's all Christmas now."

"I love Christmas," Kara sighed, tilting her head back to try and catch a snowflake on her tongue, making Oliver chuckle. "Yeah, the presents are fun, but I love spending time with my friends and family."

"It's the most wonderful time of the year," Barry sang, playfully twirling Sara around.

The blonde laughed, then stopped mid-spin when she found what she was facing. "Wait . . . I know that bridge."

"Do you?" Oliver raised an eyebrow, smirking.

Sara's eyes widened in realization. "That's the Charles Bridge!"

Kara's mouth fell open. "We're in Prague?!"

"Prague, Christmas Day, 2018," Barry grinned. "Surprise!"

"Oh, my God," Sara laughed, turning around and hugging Barry. "This is amazing!"

"Some of the best go-to Christmas markets in the world," Oliver added, smiling at Kara's awed look.

"And thanks to the Waverider, we can get what we want," Sara grinned.

"Seriously?" Kara did a double take.

"After dinner," Oliver assured her.

"Just save room for dessert after," Barry added.

Kara looked scandalized at the very thought of not doing such a thing. "Do you know me, Barry?"

"That's Oliver's job," he grinned cheekily.

He was hit by a snowball in the back of the head, making Sara laugh hysterically. "Let's get moving," Oliver grinned as Kara brushed off her hands. "We're not that far away."

"Five-star Prague steakhouse," Sara mused as she stirred whipped cream into her hot chocolate later. "The best garnet jewelry stand in the market. And now a five-star chocolate café."

"Chocafe," Barry corrected, digging his fork into the massive piece of chocolate fudge cake he had gotten.

Sara playfully scowled and picked up a piece of her fudge, throwing it at her boyfriend's head. "Same thing."

Barry caught the piece in his mouth, winking at her and eating it. Kara giggled as she dug into her chocolate mousse. "Best double date ever."

"Agreed," Oliver nodded. "Though I haven't had many double dates."

"Hey," Sara held out her hands. "I'm up for it, too."

"Maybe not on another holiday, though," Barry tilted his head, looking outside. "It gets crowded."

"We chose Prague's Christmas markets on Christmas," Oliver rolled his eyes. "I think it would of course get crowded on the holiday it's meant to celebrate."

Kara snickered, she and Sara exchanging amused looks. "What're we going to do with them?"

"Mmm," Sara playfully considered. "Love them until they get sick of us."

"Like we'll get sick of our girls," Barry countered, wrapping an arm around her.

"Never," Oliver agreed, making Kara smile and lean her head on his shoulder. "You're stuck with us."

Kara closed her eyes for a second, then opened them again, lifting her head up. "The bells are ringing."

The other three looked towards the window, and Sara chuckled, recognizing the song. "With joyful ring. It's the carol of the bells."

"Of course," Oliver shook his head, smiling.

"Gaily they ring, indeed," Barry reached for his own mug of hot chocolate, holding it up. "Merry Christmas, everyone."

Kara smiled, picking up her mug and clinking it against his. "On, on they send, on without end, their joyful tone, to everyone," she finished. "Merry Christmas."

Oliver and Sara picked up their mugs as well, clinking them against the others. "Merry Christmas," they agreed.

Kara beamed up at Oliver, kissing him as Barry and Sara did the same. "Merry Christmas, everyone," Kara whispered, and Oliver kissed her temple, the four of them happy to stay inside and listen to the bells as snow continued to fall on Prague.

A/N: I'm no good at writing dates, so I apologize if this didn't turn out the way some people expected, but the title of the short, "With Joyful Ring," comes from Carol of the Bells, which I did manage to sneak in here.

Next time: An AU version of "Deathstroke Returns" and "Promises Kept" with one twist - Slade recruits Laurel to help find Joe instead of Oliver.

First DeathSiren attempt!