"Pleaasseeeeee, Morgan!"

"Babygirl," Morgan sighed, "I've told you a hundred times, I don't dress up for Halloween."

"But it's my Halloween party!" You reasoned, following him into the break room, "All my friends outside of the BAU will be there, and I want us to look cute."

"Listen, I'll strike you a deal, but only because I love you so much," he smirked, "Come up with a really good costume, and I'll do it."

"Define 'really good'?" You eyed him.

"That, sweetness, is for you you to figure out," he winked, walking over to the coffee machine.

You groaned, "You're only doing this so I stop asking about it, and you can just say you don't like it to get out of it."

He gave you a look over his shoulder, "That wouldn't be very fair of me, would it? Come up with something really good and I promise I'll wear it."

You huffed, "Pinkie."

He rolled his eyes, a grin spreading across his face as he turned to you with his pinkie out. You interlocked pinkies, sealing the deal.

Now you just had to find the perfect couples costume.

"Hey, Pen, wanna help me with something?" You asked, hopping up onto a (miraculously) clear spot on Garcia's desk.

"Y/N, dearest, last time you said that I ended up-"

"I know, I know," you winced, holding a hand up to stop her from recounting last week's events, "that was just that one thing, though. You'll like this one."

She shrugged, spinning in her chair to face you, chewing on the end of one of her sparkly pens, "I'm listening."

"Derek refuses to do a couple's costume with me for my party this weekend unless I can come up with something really good. I feel like this is in your department," you explained, smiling hopefully.

She grinned wickedly, "You have come to the correct Jedi master, little one."

"Yes!" You cheered, "Come over tonight and we can look through Pinterest?"

She gave a pondering look, "Will dinner be provided?"

"If by dinner you mean DoorDash, then yes," you chuckled, "You know Derek is the only person in the apartment who can cook."

"Will he know I'm helping you?" She asked.

You smirked, "He'll be out with the guys for Boy's Night tonight so what he doesn't know won't hurt him."

"If he finds out and gets mad," she pointed her pen at you, "I'm telling him I was forced against my will."

You shot her a fake glare, "You wouldn't."

"Oh, yes, my darling, I would," she laughed maniacally before turning back to her computer.

You rolled your eyed, hopping back down from the desk and making your way towards the door, "My place at five!"

"Oh! What about Frankenstein and the Bride of Frankenstein?" Garcia offered, a mouth full of fries.

You shook your head, "Maybe if I was dating Reid, but I don't take Derek as a Frankenstein kind of guy."

She nodded thoughtfully, "I see your point...OOH! What about this one of a fireman and a Dalmatian?"

She showed you a picture of a shirtless guy in red suspenders, cargo pants, and a fire hat, and a girl next to him in dog ears, black shorts, and a white tee shirt with black spots.

"Okay, that's pretty cute, put it on the Maybe list," you instructed, continuing your scroll.

A few moments of silence passed as you both continued your search, until suddenly Garcia jumped beside you with a squeal.

"I think we have a winner!" She said, beaming.

"What is it?" You asked excitedly.

She paused, giving a fake drumroll for effect, before showing you her tablet screen.

"Angel and devil!"

You looked at the girl in the picture, confidently sporting a pretty white dress, white sneakers, a sparkly halo, and soft wings. You pictured yourself in the outfit and grew even more excited.

And the guy in the picture? He was wearing a black suit with a red, devil horn headband and had a plastic pitchfork with a red end in his hand, as well as red sneakers. Derek already had everything but the accessories, and you could see it in your head.

It was a winner indeed.

"Garcia, you're a genius."

"Garcia helped you?" Derek raised his eyebrows as you had him sat on the couch.

"You never said she couldn't," you put your hands on your hips, "The part starts in an hour, you're wasting time.

"Mhm, okay, let's see it then," he chuckled, "But I am a little scared now, knowing she helped."

"Oh shush, you'll love it," you rolled your eyes, "Stay here and I'll go get changed."

You trotted up the steps to your shared bedroom, changing into the silky, white slip dress with lace around the neckline. You smirked at yourself in the mirror, knowing Derek didn't stand a chance at saying now.

Especially not when you looked like that.

Your hair was already styled, all you had to do was do a very glowy make up look, pull on your white socks and sneakers, and put on your white halo headband. You did one last once-over in the mirror before grabbing Morgan's suit and accessories.

"Ready?" You called from the top of the stairs.

"Ready as I'll ever be, babygirl," he called back.

You could hear his excited smile in his voice. This was fun for him too.

"Close your eyes and don't open them till I say!" You instructed, jogging down the steps. You laid his outfit over the back of the couch opposite of him before turning back to him, "Okay, now open!"

He opened his eyes and his pupils immediately doubled in size. He stood up, walking over to you with a delicious smirk.

"Mama," he placed his hands on your hips, "I think we might have to cancel the party..."

You giggled, slapping his shoulder lightly, "I told you you'd love it." His lips immediately attached to your neck, causing your giggles to grow louder, "Der, really, the others are going to start getting here soon."

"Reschedule," he murmured, lips smiling against your skin.

You gave him a light shove, enough that he was back standing upright, "You didn't even look at yours."

He reluctantly turned away, picking up his black suit, devil horns headband, and plastic red and black pitchfork.

"Okay, I have to admit, this is pretty sick," he grinned, holding up the pitchfork.

"I'll take that as a yes, you'll wear it?" You smiled triumphantly.

"I am a man of my word," he placed a hand over his heart, "Give me just a minute."

He pecked you on the cheek as he rushed past you towards the stairs and you beamed. You knew his heart, and even if you had chosen the worst costume in the world he would've worn it still. He just loved you that much.

"Make sure you wear your red Jordan's! I laid them out at the foot of the bed for you!" You called after him.

He peeked his head out from the top of the stairs so you could see his face as he laughed and did a fake salute, "Yes, m'am."

You finished getting the refreshments and drinks ready, busying yourself until the doorbell rang.

"Pen! Oh my gosh, you look amazing!" You gushed, seeing her in her Corpse Bride costume, with Kevin in tow as Victor.

She gave you a Penelope hug in greeting, "Thanks, doll, but have you seen yourself? You're definitely the star of the show tonight."

You blushed, "Oh, stop it. Come get something to drink, the others should be here soon."

Soon enough, everyone was there. Spencer was dressed as a character from his favorite Sir Arthur Conan Doyle book, Hotch was Robin with Jack as Batman, Emily was one of Charlie's Angels, Rossi was The Godfather, and JJ, Will, and Henry were the Incredibles.

Finally, Derek came down in his costume.

Your jaw fell as he walked over to you, looking like the handsomest devil you'd ever seen. He wrapped his arm around your waist, pulling you close and whispering, "Wishing you'd rescheduled yet?"

You flushed pink, fiddling with your halo, "Who says we can't have an after-party party?"

He squeezed your hip, "I like the way you think, angel."

Emily walked over, grinning wickedly, "Well, I must say, I never thought I'd live to see the day that Derek Morgan dresses up for Halloween."

You giggled, giving Derek a pat on the chest, "It took some convincing, but doesn't he look amazing?"

Emily nodded, "You both do. You should've made it a contest between the couples. You guys even blow Garcia and Kevin out of the water."

You blushed, shaking your head, "Thanks, Em. You're killing it too, I love Charlie's Angels!"

"Thanks, hun," she smiled, "Now, do you perhaps have anything stronger to drink than the punch?"

You laughed, "Go to Rossi in the kitchen, he brought wine and scotch."

"You're the best," she threw you both a wink before walking off towards the kitchen.

You turned back around to Derek, "Who does she live closest to? You know someone is going to have to drive her home."

Derek chuckled, "That would be us. She's only a few blocks down the road."

You groaned.

Derek laughed even more, "Aw, is someone worried that driving her best friend home is going to interrupt her other plans?"

You pouted, crossing your arms, "A little."

"Well, Garcia and Kevin go passed it anyways, I'm sure you could convince them to take her," he suggested with a smirk.

"Consider it done," you grinned, popping up on your tiptoes to briefly kiss his jaw before bounding over where Garcia stood.

The night went even better than you expected. Everyone laughed, talked, played games, and enjoyed themselves immensely. It was refreshing for everyone to have a moment together without a case looming overhead.

While the party was fun, you could argue that your little date with the devil afterwards was even more fun...