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hyperfixatedoncrimminalminds · 11 months

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Emily Prentiss x Sister Reader

I need more Emily requests

Request: All I can think of is Emily having a chaos gremlin of a little sister. Everyone already knows her. Emily brings her in, and said sister gets everyone else to help her prank Emily. If Tara could also be mentioned in some fashion, that'd be great!

Reader is 12

Third person pov...

Y/N Prentiss is the little sister of SSA Agent Emily Prentiss and she is a prankster and a certified chaotic Gremlin, the little 12 year old loves pranking her sister with Emily's team.

She even gets the Grumpy Unit chief Aaron Hotchner to join in on a couple of her Pranks.

It was one of those boring days at the FBI academy for the team they weren't on any cases and had lots of paperwork to do, Spencer was working digitally at his desk and was flying through the paperwork as he enjoyed it.

Behind him Derek and Emily were sat giggling loudly like children as they kept throwing rolled up pieces of paper at the poor man.

The laughter increased as they kept hitting their mark, Spencers head, the genius was non the wiser as a pile of paper was forming around him at their many failed attempts.

From the side JJ and Penelope sit and watch as Spencer doesn't realise, then a recognisable person walks through the elevator and into the bullpen.

"Hey guys!" Exclaims the girl they all love Y/N Prentiss, Penelope and JJ laugh when the girl is tackled by her older sister, Emily throws away her paper and pulls Y/N in for an one arm hug.

"Hey lil sis" she said as her sister laughs "hey Em" laughs Y/N as she struggles to get out of Emily's hold, she is the rescued by Morgan who fireman carries to 12 year old away from her sister.

Emily gasps dramatically "how dare you Derek Morgan stealing my own sister from me!" She exclaimed as Derek puts Y/N down, the giggling 12 year old manages to evade her sister and runs up the ramp to Rossi and Hotches offices.

Woth Emily hot on her tail she knocks quickly and loudly on Hotches door and ducks when he opens it, her sister isn't so lucky.

Emily had jumped into a Crouch just before the sneaking gremlin knocked on her bosses door, Hotch doesn't even question Emily as she freezes infront of his door, he then sees the source of the laughter outside his door.

"Hello again Y/N, having fun annoying your Sister?" He asks hsut about hiding a smile of his own, the 12 year old smiles innocently at the man "of course Hotch" she said before running to the safety of Penelope and JJ.

They all watch as an embarrassed Agent Prentiss stalk back to her desk after getting a look from her boss, Y/N smirks as she perches on Spencers desk.

The man had stopped writing once he heard the common behind him. "That was fun right Spence" she said to the genius who nods. "Everything is fun with you Y/N" he says before going back go paperwork rolling his eyes when he finally notices the growing pile of rolled up balls of paper around him.

"So why are you here Y/N?" Asks Penelope, the girl turns around and in a whisper says "I'm here to pull as many pranks on Emmy as possible this week" as she pulls away a smirk makes its way on both woman's faces. "Can we help." Asks JJ earning a nod from the girl.

'This will be fun' thought the 12 year old to herself.

It was 9am time to start the longest prank war ever, Y/N first goes to Penelope to get her help. "Hey pen, can you print copies saying 'this ___ is now voice activated please say ___' says the evil 12 year old making the tech analysis laugh gleefully.

"Of course my love I will" she says before getting to work on Y/N first prank. 'Because Emmy is getting on in her old age, I thought prankjng her woth pretending everything is voice activated will be hilarious' Y/N giggle evilly as Penelope finishes of printing them out for her.

Soon her prank is set in motion, Y/N,watches as Emily falls for her first prank, the woman was making coffee when she sees one of Y/N voice activated paper.

"This coffee maker is now voice activated just say what drink you want" she mutters, she the puts her cup underneath the depenser, Y/N covers her mouth with laugher as her sister actually says what the paper says to say.

The Agent gets weird looks at she talks go the coffee maker, while her Grelim sister dies of laugher in the corner, Y/N manages to get away and plans her next prank.

The next prank Y/N involves Rossi as he is the best cook, saod man is now staring at Y/N as if she had a second head. "You want me to do what for your prank?" He asks making Y/N sigh.

"All I want is brussel sprouts to be covered in chocolate ans then put in a box so Emmy will think they are chocolate and eat them simple, please Rossi!" Begs the teen.

Rossi easily gives in what even he's a softy for the young girl. "Fine" he sighs as the girl cheers.

The next day Emily finds a box of chocolates on her desk, surprised she opens it ans picks one out, Y/N is spinning around in Spencers chair and has the best seat. Just as a Emily bites into the 'chocolate' she instantly spits it back out coughing loudly.

"What the fuck!" She exclaims not noticing her sister ans the others watching with knowing eyes.

Time for the next prank.

Y/N corners JJ is her office, "I need your help. You know when Emily leaves for lunch don't you?" She asks the Blonde, JJ nods her head looking suspiciously at the teen.

"What time does Emmy take her lunch break?" She asks. "Is this for another prank?" "Yes" "then fine, she takes it at 12pm everyday and is gone for 15 minutes, now tell me" Says the blonde.

Y/N excitedly tells the blonde what she's going to do. "Okay so it involves bread and lots of it"

Later that same day Emily leaves at lunch Y/N gets to work, with the help of JJ the two open and dump out two loafs of bread into Emily desk and in all the draws nothing is left unbreaded.

Y/N is laughing uncontrollably at the face Emily will make, "quick she will be back soon" Yells JJ and the two make themselves look innocent before Emily walks back in and goes to ber desk.

"What the fuck" she yells as piles of bread is in every one of her draws and on top of her desk. In JJs office the two are laughter uncontrollably as they hear Emily's yell from the bullpen.

Y/N next accomplice is Spencer. The man is busy at his desk before Y/N appears scaring the daylight put of him. "Hello Y/N" he says not liking thr evil grin on the girls face. "Heyy spence, just wondering how many sticky notes would you need to cover a car?" She asks making the genius roll his eyes.

"Another prank for Prentiss?" He asks earning a nod from the girl. "Fine, about 5,000 sticky notes, do you need help?" He asks making the girl jump up from his desk and start dragging him away from the building.

For the next couple hours to two work together to cover Emily car in sticky notes, some how the arw done before the day is over so they wait until Emily comes down to the parking lot.

Hours later Emily arrives to her car, the black haired woman just laughs when she sees her car. "Seriously!" She exclaims as Y/N and Spencer high five each other prank complete.

Next one Y/N hunts down Derek. She easily finds him and corners him, "Hey can you distract Emmy for me it's for a prank" she says, Derek is to happy not to help her.

As Derek distracts Emily, Y/N goes into action and grabs a piece of paper and writes on it before grabbing lots of tape and begins taping it to the bottom on Emily's mouse.

When Derek finishes distracting Emily he goes back go his desk woth Y/N at his side, the two watch as Emily tries to use her mouse but finds that she can't, the black haired woman get annoyed with it and turns it around only to find a piece of paper taped to the sensor with 'Ha ha ha ha ha' written all over it.

Pissed off she throws the mouse away. Derek discreetly high fives the trouble maker next to him, Y/N watches Hotches office "now for the Boss" she mutters.

For the last prank Y/N knocks on Hotches office and walks in when he calls. "Still pranking your Sister Y/N, what do you need me to do?" He asks getting straight to it.

Y/N smirks. "All you need to do I'd be yourself but not" she says mysteriously making Hotch raise his eyebrow at the girl he was expecting something more evil.

Throughout the day Hotch would just appear and ask Emily random questions about her cases making the woman paranoid at every movement. But thr end of the day the whole team was having way to much fun messing with Emily.

When Y/Ns alast day arrived she gathered the team in the bullpen. "Well its been fun but I have to go Mother is expecting me back" she says rolling her eyes but then looks at Emily. "I've had the best fun this week guys, thanks for helping out" she says making Emily glare at her.

"It was you who's been messing with me all week, you even got my team involved!" Exclaims Emily making a grab for Y/N who hides behind the closes perosm who happens to be a woman Tara Lewis who was new to the team.

While Emily was distracted Y/N made her get away. Tara looks at thw team "Your repretation proceeds you" Says the Dr as the team laugh and fill her in on what she missed.

The end!

Hoped you like this oneshot, this was fun to write, as usual sorry for the grammar and Spelling mistakes

Request are open!

Word count: 1783

#criminal minds #fanfic #behavioural analysis unit #x child reader #fluff and comfort #oneshot #x sister reader #emily prentiss #emily prentiss x sister reader #prank #chaotic little gremlin

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