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The calendar on Alex’s phone read March 28th, and she’d already swiped past it twice without a second glance. It was just another Tuesday. Cases to review. Training drills to run. A date night with Lena she was already looking forward to.
Then Lena asked the question.
They were curled up on the couch, Alex’s arm around Lena’s shoulders, Lena’s fingers tracing lazy patterns on Alex’s palm. It was comfortable. Easy. The kind of quiet Alex had spent most of her life not knowing she needed.
“Alex,” Lena said, her tone carefully neutral. “Do you remember what day April 10th is?”
Alex’s brain, trained for threat assessment and rapid response, did a full system scan.
April 10th. Not their anniversary— that was July. Not Lena’s birthday— that was December. Not the anniversary of anything terrible, as far as she knew. No mission dates. No court dates. No—
Is this one of those girlfriend questions?
She remembered picking Kara up from CatCo once, years ago, and overhearing one of her colleagues—a guy from accounting, maybe—venting to her in front of her desk.
"She asked if I remembered what she'd ordered at that restaurant in Metropolis. Three years ago, Kara. Three years. And I said no, because who remembers that? And now she's not returning my texts."
Kara had patted his shoulder sympathetically while Alex tried not to laugh. Now the universe was returning that energy tenfold.
Alex’s mouth went dry.
“Important how?” she hedged, buying time.
Lena’s expression didn’t flicker. “Just. Important.”
“Right. Important. Definitely.” Alex nodded. “Yes. That day.”
Lena smiled— small, knowing, the kind of smile that said I see you— and let it drop. She kissed Alex’s cheek and went to make tea.
Alex stared at the blank TV screen.
What am I forgetting?
---
Two days later, Alex cornered Kara in the DEO break room.
“You’re acting weird,” Alex said.
Kara, mid-bite of potsticker, froze. “I’m not acting weird.”
“You’re always acting weird. This is a different weird.”
“That’s very specific.”
Alex crossed her arms. “What’s happening on April 10th?”
Kara’s eyes went wide— just a flicker, but Alex caught it. Then her expression shuttered, the way it did when she was trying very hard not to give something away.
“I can’t tell you,” Kara said.
“Can’t or won’t?”
“Both.” Kara set down her potsticker. “It’s not my place. You need to— you should figure this out yourself.”
Alex felt something cold settle in her stomach. “So, there is something.”
“I didn’t say that.”
“You didn’t have to.”
Kara’s face softened with something that looked dangerously like pity. “Alex, just—think about it, okay? It’s important. Really important.” She paused. “To Lena.”
To Lena.
Not to Kara. Not to the DEO. To Lena.
Which meant Alex had missed something about Lena. Something significant enough that even Kara knew about it, and Kara was standing here telling Alex she had to figure it out herself.
Like she was being tested. Like she was failing.
“Right,” Alex said. Her voice came out flat. “Think about it. Got it.”
“Alex—”
“I have to go file reports.” Her eyes avoiding Kara’s and her shoulders slumped.
She left before Kara could say anything else.
---
The cold feeling didn’t go away.
Alex started keeping notes.
April 10th. Lena’s family? No. Lillian’s birthday was in November. The Luthor Corp IPO? Old news. A scientific anniversary? She checked Lena’s published papers. Nothing.
She started paying attention to every offhand comment Lena made and stared at them like they were classified intel.
“The lilacs will be blooming soon.”
Alex wrote: Lilacs. April. Symbolism? Hidden code?
“I’ve been thinking about that case you solved last spring.”
Alex wrote: Which case? Which day? A forgotten promise?
“Kara mentioned you used to take Eliza to the botanical gardens.”
Alex wrote: Mom? To call Eliza?
She was spiraling and she knew it. But the alternative— admitting she’d forgotten something important to Lena— was worse.
And now Kara knew. Kara, who never kept secrets from her anymore. Kara, who was looking at her with careful, guilty eyes every time they passed in the hallway.
You need to figure this out yourself.
Which meant Kara thought she should know. That whatever this was, it was obvious. That Alex was the only one not seeing it.
She lay awake that night, chest tightened, Lena warm beside her, and ran through every conversation from the past month. Every date. Every offhand reference.
Nothing.
---
What Alex didn’t know: across town, Lena and Kara were having an entirely different crisis.
“She asked me again,” Kara said, shoving another box of decorations into her desk drawer. The metal scraped softly. “She looked— Lena, she looked really upset.”
Lena paused mid-scroll through catering options, her thumb hovering above the screen. “Did you tell her anything?”
“No.” Kara rubbed the back of her neck.
“I said she needed to figure it out herself.” Kara winced. “Which maybe came out wrong. She kind of— deflated.”
Lena’s gaze dropped to the tablet in her hands. She was quiet for a moment, fingers tightening slightly around its edge. “She’s trying to remember something she thinks she forgot.”
“She didn’t forget anything.”
“I know that. You know that. Alex is currently constructing an elaborate conspiracy theory about why April 10th matters to me and why she’s the only one not in on it.”
Kara groaned. “This is why I just tell people when I love them.”
“You literally hid your identity for years.” Lena glanced up at her, one brow lifting.
“I said tell, not be emotionally vulnerable.” Kara shot back, pointing weakly.
There was a beat. Then Lena signed, softer, concern slipping though her composure.
“Kara—” Lena hesitated. “If she asks you again,” her voice very soft,
“just tell her. I can rethink the surprise. But she can’t keep thinking she’s wronged me.”
Kara’s expression softened, guilt setting in. “Okay.”
---
April 9th.
Alex had nothing. She’d combed through her calendar, her texts, her memory. Finally, she called Maggie—casually, like old friends do.
“Hey, random question,” Alex began. “Did I ever mention an important April date to you?”
“You mean besides your birthday?” Maggie laughed.
“Haha, yes, besides that.” Alex chuckled, a little too quickly.
There was a beat of silence, then Maggie’s voice came back, warm but teasing. “Alex, what is this? You’re not in some kind of trouble again, are you?”
Alex laughed it off, brushing the question aside.
“No, no. Just me being weird. Forget I asked. I’ve gotta run.”
She ended the call before Maggie could push further, cheeks warm with embarrassment.
Your birthday. Right. April 10th. That was her birthday.
But Lena wouldn’t make that big a deal about her birthday. Alex never did. Birthdays were for other people. Kara deserved elaborate surprises and handmade cakes. Lena deserved anniversary trips and carefully chosen jewelry. Alex was fine with a text from Eliza and maybe dinner if she remembered to plan it.
So it couldn’t be that.
Which meant she’d missed something else.
She thought about Kara’s face. It’s important. To Lena.
What was important to Lena? Science. Coffee. Her brother, complicated as that was. The city. Kara. Alex.
Alex.
But Alex didn’t have a thing. There was no anniversary in April, no milestone, no—
Unless it was something she should have been. Something Lena wanted that Alex hadn’t given her.
The thought sat heavy in her chest all day.
That night, Alex barely slept. She watched Lena breathe beside her, dark hair spread across the pillow, and tried to memorize every detail. If she’d forgotten something important, she needed to remember it. Needed to fix it.
She was still awake when the clock ticked over to 12:01.
---
Morning came gray and soft. Alex heard Lena’s alarm go off, felt her shift in bed, heard her pad to the bathroom.
When Lena came back, Alex was sitting up.
“I’m sorry,” Alex said.
Lena stopped.
“Whatever it is,” Alex continued, words tumbling out. “Whatever I forgot. I’m sorry. I’ve been trying to figure it out for two weeks and I— I don’t know what I missed. Kara knows and she won’t tell me because she thinks I should know, and I don’t, and it’s important to you and I should have remembered. So. I’m sorry.”
Lena was very still. Then her face did something complicated—surprise, realization, and something softer that made Alex’s chest ache.
“Alex,” Lena said slowly. “What day do you think it is?”
“April 10th.”
“And what do you think happens today?”
Alex swallowed. “I don’t know. That’s the problem.”
Lena crossed the room, sat on the edge of the bed, took Alex’s hands. Her thumbs swept across Alex’s knuckles.
“April 10th,” Lena said, “is the day a woman I love very much was born. And it is also the day I have been trying, with Kara’s help, to throw her a surprise party she absolutely did not see coming.”
Alex blinked.
“Wait.”
“Yes.”
“You— the party— Kara’s been helping you— for me?”
“For you.” Lena’s mouth curved. “Kara said you never celebrate. That you always forget or deflect or work through it. And I thought: not this year.”
Alex’s eyes were stinging. “I thought you were mad at me.”
“I thought you were pretending not to know about the party.”
“I wasn’t pretending. I really didn’t know.”
“I gathered.”
Alex laughed, wet and disbelieving. “I spent two weeks thinking I’d forgotten our first date or something. Or that you were— that you wanted something from me I wasn’t giving you.”
Lena’s expression flickered. “Alex.”
“Kara said I had to figure it out myself. That it was important to you.” Alex shook her head. “I thought I was failing some test.”
“There is no test.” Lena’s voice was firm. “There was never a test. I just wanted to give you a nice birthday.”
“I don’t need—”
“I know you don’t need it. That’s the point.” Lena held her gaze. “You don’t need it, and you never ask for it, and you forget yourself so completely that you spent two weeks believing you’d wronged me somehow because I asked about a date. That’s why I’m doing this. Because someone should remind you that you matter.”
Alex didn’t have words for that. She leaned forward instead, pressed her forehead to Lena’s.
“So,” she managed. “Surprise party?”
“In approximately six hours.” Lena said, lips twitching. “Kara is currently inflating balloons in the DEO conference room. I told her to wait until seven, but she started at dawn. Half the tactical gear is buried under streamers.”
Alex blinked. “You mean my agents are running drills surrounded by confetti?”
“Color-coded confetti.” Lena corrected smoothly. “She insisted it matched your eyes.”
Alex laughed, incredulous. “She always wanted to throw me a party.”
“She’s been insufferable about the secret-keeping.” Lena admitted, fondness in her tone. “I think it’s good for her. And for you.”
Alex smiled. “Six hours.”
“Six hours. Which gives us time.” Lena tilted her head. “You could open your first present early.”
“Yeah?”
Lena kissed her. Soft and slow and deliberate. Alex sank into it, felt the tension of the last two weeks drain out of her shoulders.
When they broke apart, Lena was smiling.
“Happy birthday, Alex.”
Alex pulled her close.
“Okay,” she whispered into Lena’s hair. “Maybe this birthday thing isn’t so bad.”
---
Later, at the party, the DEO conference room looked almost normal—briefing tables cleared for food trays, a banner stretched across the wall, and a neat cluster of color coded balloons tucked discreetly in the corner. Alex’s eyes swept the room, then landed on Kara.
“Balloons?” Alex asked, her tone dry but her lips twitching.
Kara grinned sheepishly. “It’s subtle. Lena said no confetti cannons.”
Lena, standing close enough to catch Alex’s hand, smirked. “You’re welcome.”
J’onn passed by with his quiet smile, and Eliza’s face flickered warmly on the video screen. “Happy birthday, sweetheart,” Eliza said. “I wish I could be there in person.”
Alex’s expression softened. “This is enough. More than enough.”
Across the room, Kara mouthed, Sorry about the figuring it out thing.
Alex narrowed her eyes and mouthed back, We’re talking about that later.
Kara winced, but her grin didn’t fade.
Then Winn appeared, balancing two plates of food, his expression caught somewhere between nervous and earnest. He cleared his throat, clearly working up courage.
“Okay,” he began, voice wobbling just a little, “most days you terrify me. Like, seriously, I’ve had nightmares about your glare. But—”
he shifted the plates in his hands, almost dropping one, “you’re also kind of the heart of this place. You keep us together, you keep us safe, and… you’re basically my big sister. So… happy birthday, Alex.”
He paused, as if considering whether to keep going, then added quickly, “And, uh, please don’t yell at me for saying that.”
Alex chuckled, shaking her head. “Relax, Winn. I’ll let it slide—just this once.”
Winn looked relieved, but his nerves got the better of him again. “Right, good, because I was about to launch into this whole speech about how you’re the glue of the DEO, but—” He caught Alex’s raised eyebrow and froze. “Okay, stopping now.”
“Smart choice,” Alex said, amused.
Grinning sheepishly, Winn handed her one of the plates. “Fine, I’ll stick to food. But for the record, Lena snagged the biggest slice of cake for you. I wasn’t brave enough to fight Kara for it.”
From beside her, Lena pressed the plate into Alex’s hand with a satisfied smile. “See? I told you I’d win that battle.”
Alex raised a brow, smiling despite herself. “You fought Kara and won? That’s impressive.”
“Hey!” Kara protested, pouting just enough to make Alex laugh.
One by one, other agents drifted in, some still in uniform, some ducking in between shifts. Each paused long enough to clasp her shoulder, offer a quick “Happy birthday,” and then slip back to their posts. Even those on duty made time to stop by, their brief greetings carrying weight.
The laughter lingered, light and unforced, filling the disciplined space with warmth. For once, Alex let herself smile fully, realizing that even here—inside the most rigid place she knew—she was allowed to be celebrated.
And after that night, Alex never forgot her birthday again.
She had too many people to remind her.