DISCLAIMER: I do not own What Happened to Monday
I love the movie even if I hated how my favorite characters died T_T. So now am writing a fic.

A/N: Sorry if OOC, this is how I feel like writing them. Aaaand, they ain't mine. Plus there aren't much characters so mostly we'll see Cayman, the Sisters, Adrien, Eddie, Terrence, the douchebag and the rest I made them up.

Summary: Two weeks after they found Monday and discovered her secret, they continued to live a normal (is it even normal?) life again. Until this time, the youngest lovable Sunday is the one who disappeared.

Chapter 001: Sunday Gone Missing
Sunday Evening

Two weeks have passed since Monday went missing and was found, along with her secret relationship with Adrien Knowles that's already ongoing for two months! She's been seeing him once a week and she's even been in bed with him without telling them or showing them her account of the day. The secret was hidden well if she hadn't been missing. And now it's been a running gag to the sisters to tease their eldest sibling about it.

They all stay in one apartment and just do their own thing while waiting for the current Karen Settman to come home. There's the dining room on the left, going forward to the north and there's the kitchen. On the right there's the study room and the computer located between the study room and the living room. In between was a free space where the walls are covered with shelves and in the middle the path leads to their secret door where they hide just in case visitors come in. On the second floor, Thursday and Friday's room and the attic.

Tuesday and Wednesday stays together in one room, Saturday and Sunday whille Monday has a room of her own. Must be a privilege as the eldest child. She had her privacy but even if she had her own room now, with her secret revealed, it didn't feel as reassuring as before.

Monday was reminiscing her time with Adrien. She haven't flirted with him for two weeks now. They see each other on his usual Monday shifts but she could not do anything else. She's under tight surveillance until she's proven to them that no matter how much she loves Adrien, she'd never betray her sisters. 'Haven't any of them fallen in love with anyone before?' she pondered on the thought.

Surely for the past 30 years that they all spent, there's at least a first crush for Friday, an affair with a married man for Saturday or unrequited feelings for a bureau agent for Sunday. Then again, she was the one who fell in love with a bureau agent. Not them.

Thinking about it, none of them ever opened up about loving anyone, whether just being flirtatious of to be serious. Maybe Saturday gets to brag all the time about how handsome men are flocking around her like hungry dogs or Sunday saying that there are a few guys showing interest in her (to which everyone quickly and violently reacted-protective older sisters mode-to this statement) or Wednesday saying she feels attracted to a guy (in a way that she wants to beat him up if he dares hurt her feelings - not exactly the romantic kind of thing).

'Is it really just me?' Monday can't help but be bothered of that fact - if it were a fact.

Gazing at the round clock on the wall, she noticed that it was already passed 7. She tapped a finger on her chin as she meditated why she feels as if something were off about the time. "Sunday." she mumbled as she got up her bed and went to the living room.

She heard something in the living room so hurried up, 'Oh no, Sunday please, don't tell me...' as she arrived in the living room, she sees that Saturday was standing on the couch, holding a dualshock controller in her hand as she raised both arms in victory. Wednesday was mumbling curses as she sat on the carpet, passing the controller to Tuesday who gladly took it from her. Monday glanced on the wall, seeing a large text flashed on the wall, "You Win".

"Oh hey Monday, done sulking already?" Tuesday greets.

"You just missed my big win." Saturday chirped, still doing her triumphant pose and sticking a tongue out at Wednesday who cracked her knuckles now. "I guess I have more talent than I seem."

Monday then felt someone hold her by her shoulder and she was startled by this, resulting for her to jump back in surprise, unknowingly startling Friday who was behind her. Friday drops the papers in her hand and everyone stared at the scene. Thursday just got down from her room when she saw this. "I'm sorry Friday." Monday managed to say as she knelt down to pick up the stuff that Friday dropped. Friday hurried, while panicking, helped Monday pick it all up.

"It's okay, I uh, I was surprised you left your room early." Friday tells her.

"You seem jumpy tonight, what's the matter?" Wednesday asked the eldest sister who stared at the scribbles and drabble on one of the papers she picked up, seeing that one of them seemed like a story of some sort.

"You write?" Monday says, ignoring the question asked her, and hands the papers back to Friday who snatched it fast.

"Isn't it a bit late already?" Thursday interjects to get everyone's attention. Friday hugged the papers close to her and muttered her thanks to Monday before going to one of the shelves to hide the papers in between pages. "Sunday should've been here by now."

Everyone turned to the clock this time, excluding Monday, seeing that it was already 7:19pm. "You're right, Sunday is never late." Tuesday agreed. "She normally comes home between 6 and 7 pm."

"So she's late for about twenty minutes," Saturday said with a shrug, "maybe she just decided to stay a little late for once."

"Shut up and sit down, Saturday." Monday scolds the woman who forgot that she was still standing by the couch and sat down, allowing her butt to bounce on the soft cushion, her feet beside Wednesday who pushed it away.

Thursday looks out the window, taking a peek at the streets below. "It's unlike Sunday to do this." She says and Monday couldn't agree more. It was the reason why she was bothered by the time earlier. It was because their baby sister still haven't come home. And it's just like Thursday said, it's very unlike Sunday to be out late. "Maybe if it were Saturday or Tuesday we wouldn't worry like this."

"Why do I feel offended when I heard that?" Saturday asked herself a loud, now sitting in a lotus position on the couch but the tips of her toes are touching and tickling Wednesday's neck since she was leaning on the couch. Wednesday shot her a glare to intimidate her. But the latter merely smiled at her.

"Maybe Sunday fell in love and decided a one-night-stand with a guy." Tuesday offered and everyone gasped.

Wednesday hits her sister lightly by the arm, Thursday and Monday leaned close to Tuesday to send her menacing stares while Saturday clicked her tongue at her orange-haired sister and Friday shaking her head in denial of the statement. It was as if it was an impossible thought or that the thought itself was offending their baby sister. She was as innocent as a child, as pure as a virgin maiden would be and it would take all six of them to approve a guy (if ever she did fall in love with someone) before anyone would touch her.

Tuesday shrunk beside Wednesday, grabbing a pillow to hide her face in shame that those words left her mouth in the first place. "It was merely a thought." she wanted to justify.

"You mean like it's What-Happened-To-Monday all over again?" Wednesday tells her and she nods. "If that's the case, should we-"

"Oh hell no! We are not going to wait for a day before we try and search for her!" Monday and Thursday said in unison. It was surprisingly one of the few things they had in common and one that they don't argue about. Protecting Sunday. The two stared at each other when they realized they said they same thing, they would've been so identical if it weren't for their hair and personality.

Saturday groaned and allowed herself to lean on Friday's lap as soon as Friday sat beside her. "This is it. We're all reaching puberty and one-by-one, we'll ALL have our moments that we'll disappear and do it with a guy. Do you think Sunday also has weird fantasies about getting choked during-" she commented and chuckled on the last part but she stopped when, this time, everyone's eyes darted on her. "Monday had unexpectedly had these fantasies. I would be more surprised that Sunday also had these dreams deep inside."

"And you don't?" Monday retorts but the latter shook her head proudly. They all do not believe her.

"Yeah I honestly did not expect it from Monday. I mean, she's Ms. Perfect!" Thursday agreed. "Then again, I guess she wasn't as perfect as we thought she is." finally she's able to do a low-burn on Monday, letting out a smirk of victory towards the eldest.

But Tuesday finally un-hid herself from the pillow and gazed on one of her sisters. "What would be more surprising is if Friday had erotic fantasies as well," She winked at Friday whose eyes widened at the accusation.

"I never had such fantasies." Friday defends.

This time, Saturday just had an idea as her eyes sparkled at the sudden thought. Her feet pokes Wednesday by the cheek, "I got one! Just in case all of us wants to be dominated by our lovers, Wednesday would be the total opposite. She'd totally dominate the guy!" she exclaimed and this time Wednesday did not ignore her and grabs her feet to tickle her. Saturday began to squirm and laugh. "Stop it!"

"Okay enough about my BDSM fantasies," Monday scolds, not wanting to delve further into the topic. "We've got to think of something to find Sunday. Maybe she didn't meet a guy, there's also a chance that she got held up or something." she tried to explore other possibilities that they haven't thought of yet.

"Well, tomorrow is your day." Thursday says and everyone was quiet as they looked up at their big sis. "Be our big sister and prove to us that you will never abandon us." she challenged. Monday saw the looks in everyone's eyes, the hidden feelings and unspoken thoughts are all written in their eyes. Despite being all-grown up now, she'd look at them all like little girls, looking up to her to protect them.

Tuesday was the second eldest, irresponsible in some ways but they can always count on her to give them good food and cool gadgets whenever she'd come home. But right now, she was looking at Monday's eyes, being hopeful that she doesn't have to be the only big sister among them. She wants to trust in Monday and she wants to learn from Monday. Wednesday wasn't one to show much worried expression or fear, but her eyes also give her true feelings away. She respects Monday and she cares about everyone like a big sister would but she would never take Monday's place and try to be on top. In the end, despite her strong visage, she's still a softy on the inside.

Among all sisters, Thursday was the one that Monday clashed with the most, probably because she's the troublemaker of them all. The most memorable thing she did was sneaking out while it was Saturday's turn to leave the house and comes back with no left index finger. It was the worse night of their lives because they all had to suffer for what Thursday had done. As time had passed, no one mentions it unless it was a pretty heated argument. But this time, despite the hatred and irritation, Monday saw that Thursday was also looking for her big sister to be there and care for them.

Then there's Friday, as fragile as a glass. She isn't as confident as Saturday (or maybe Saturday had too much confidence), as brave as Wednesday, as strong as Thursday or as wild as Tuesday. But she is as unique as the rest of them. And right now, Monday could see that she's probably the one who is scared the most regarding Sunday's absence tonight and there's no one to run to but her big sister, just like she'd do when she was younger. And lastly, Saturday. Even though she's the prettiest of them all (has nothing to do with this situation), she's also scared but she's a pretty good actress that she can hide it well. Maybe not as good if Monday could see through it though.

Her sister needs her. That's why, "I won't abandon Sunday or any of you." she says, a few them seemed relieved, "I promise." The moment she promised, the anxiety in the atmosphere faded almost immediately. Just a few words from her and all is well for them. That's how strong and powerful her words are for them.

Tomorrow is her day, she needs to prepare herself.

Later that same night, everyone was asleep, except Monday.

She couldn't bring herself to sleep, she couldn't find peace. She loves Adrien and she's been itching to see him again, perhaps be able to hold his hand or be kissed by him like the usual, but right now she wasn't sure if she could still spend enough time with him. She only has 13 to 15 hours max to figure out where Sunday could've been. Her GPS locator was off, they can't reach her phone but they left messages, she was just gone.

Monday got up and passed by the living room before heading to the kitchen to brew herself some coffee. Total opposite of what she's supposed to do if she wants to sleep. But she was able to glance at a figure lying down the couch.

"Saturday?" she took a guess and she heard a soft moan from under the blanket. "What are you doing here?" Saturday removed the blanket from her face and took a peek, seeing that it was only Monday.

"I don't want to sleep alone." she says.

It reminded Monday (of what she hadn't forgotten) that Sunday is missing. She's Saturday's roommate and now she doesn't want to sleep alone. "You can sleep in my room." she offered. "I couldn't sleep anyway." Monday's never offered her room to anyone. Perhaps to Sunday once in a blue moon but never to someone like Saturday so she was caught in surprise by this sudden offer.

Saturday wrapped her sister in an embrace, "Please don't leave us."

Monday knew that everyone was afraid that she'd choose Adrien over them. She was the eldest and her decision makes a difference, a huge impact to their lives. She returned the embrace and kissed her sister on the crown of her head, "I won't. And I'll bring Sunday back, everything will be the same again."