Undertale AUs (Fluff, Smut, and Who knows what)

Nightmare x Reader x Killer (Fluff)

Requested by @joshuajones662589
Hope you enjoy!

Today was our first anniversary of me, Killer, and Nightmare.

It's still a wonder how we managed to stay together in a relationship....but it was worth every moment. When we first met, I was just another prisoner but Killer's flirts and Nightmare's caring nature (though he denies it) really made me fall in love. Nightmare even disbanded his gang and the two moved in with me for a domestic lifestyle. I know they work hard to keep me happy so I want to do something extra special in return.

I gasped when two arms wrapped around my waist, "Hey Kitten. Whatcha making?"

"Something delicious for tonight. It'll be done in a few. Where's Nightmare," I asked.

"He called a minute ago. Finishing up some paperwork and he'll be done as soon as dinner's done," He leaned in closet to whisper, "And anything coming from you is always delicious. Can't wait to see what you made for dessert~"

I blushed before shooing him off, "Don't even think about it! Why don't you set up the table while you're here?"

He bowed dramatically, "As you wish~"

I shook my head and giggled. He can be such a dummy sometimes. I finished up with the food and began to serve it. I heard the door ring and I quickly rushed over, cleaning off stains from my hands to open the door.

"Hey sweetheart," I said as soon as I opened the door.

Nightmare smiled widely, "Hello my love....heh. You missed a spot." He gently wiped off a stain from my face with his thumb before giving the area a small kiss.

I blushed when he licked his thumb, "Nighty!"

He smirked, "Couldn't help myself~. I see you made spaghetti tonight."

I rolled my eyes, "Yeah. Simple but delicious. Now come in already before Killer eats your portion."

"Already ooooooon it," Killer called out from inside.

"Killer I swear if you pull that again, I'm going to break all your anime crap," Nightmare shouted as he rushed inside.

"Don't touch my Miku collection," Killer shouted back.

I sighed and closed the door before following after them. I hope they behave tonight....We had our meals and chocolate desserts and luckily no food fight like last time (*cough* Killer's fault *cough*).

I clapped my hands together, "Alright! Now that we had our dinner, I have a surprise for the two of you!"

"Awwww you didn't have to," Killer said.

"Too bad. I did anyway," I stuck my tongue at him before pulling out two wrapped up gifts, "Happy anniversary to my special guys."

Killer and Nightmare looked surprised but happy as they received their gifts. Killer excitedly showed off his gift: a Karambit knife with a kitty charm to go with it. Nightmare was already reading his new book with intrigue.

"Thanks Kitten! This is an awesome addition to my collection," Killer announced.

Nightmare chuckled, "Lovely book as well. A classic. You know me well love. Would you like our gift now?"

I tilted my head, "You guys got me something? Together? What is it?"

They both smiled and blushed, "Close your eyes~"

I did as told, waiting for the surprise in anticipation. I felt someone move my hair a bit as the other slipped something around my neck.

"Ok....you can open your eyes," Killer said.

I looked down to see a silver heart locket around my neck. The intricate designs around the heart was absolutely astonishing. I noticed opened the heart and a little melody played out as I stared at a small photo of us in the locket, stowed away like a little treasure.

Nightmare looked nervous, "Do you....like it?"

I sniffed, "It's beautiful....I love you two so much!" The hug caught them off guard but they gladly returned it.

They gave me loving expressions that melted my heart, "We love you too"

Bonus:

Nightmare noticed another wrapped gift at the table, "What's that one for?"

"Hm? Oh THAT one?" I smirked with a suggestive wink, "That's for later~" Nightmare and Killer were blushing messes.

"Aw hell yeah-," Nightmare smacked him upside the head making us all laugh.