Before we begin, usual rules of Reader-Insert Fanfiction:
H/C - Hair Colour
E/C - Eye Colour
Y/N - Your Name
On to the story!
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It was the usual day in the guild. Tables took flight, shattering into a million splinters as they hit opposing walls and magic spells were thrown around like rag dolls.
As per usual, Natsu had demanded that Gray fight him, to which Gray took no time in accepting then stripping... But that was interrupted by a (H/C) as terrifying as her sister.
The girl had the same face and personality as Erza, the feared purple aura which shrouded her was as dark as her elder sister's. The (H/C) girl walked between the fireball and ice-stripper to interrupt before the fight began. Natsu glared at the girl in the armour, identical to Erza's, before giving his famous ear-to-ear grin and tackling her. Natsu then decided to say the most famous phrase to which the guild complained:
"(Y/N), fight me."
It was loud enough for the S-Class mages on the second floor to hear. "Natsu, you can't beat Erza," she began as the pink-haired idiot beamed. "You can't even beat Gray!" The other Scarlet heard a scoff from behind made by the ice mage, but that was silenced by the pair who screeched, "Gray, put on some clothes!" Which lead to him screaming and frantically searching for his clothes, just clad in boxers.
Whilst Gray was doing that, the guild settled into its usual routine, only with Natsu clinging to the (H/C) mage. She piped up as Lucy walked through the doors. "Lucy!" She called as she tried to stand up, but Natsu was fast asleep on her shoulder. She fell to the floor, dragging Natsu with her, like a limp toy. "Natsu! Get off!" Erza screeched as she protected her baby sister. Natsu slowly came around whilst Lucy was pulling him away.
"Oh shit! Sorry, (Y/N)!" He said as his arms dropped to his sides and Erza helped up her sister from the floor. The girl thanked her sister and headed over to where Natsu, Lucy, Gray, Juvia, Wendy and Carla whilst Happy nestled into her arms as she took her seat.
"Am I comfy or something?" (Y/N) asked, Natsu blushing and glaring slightly at the anthropomorphic blue cat whilst nodding his head.
"Yeah, you are!" The hot blooded male responded whilst moving next to the younger Scarlett, causing Lucy to shriek that the pair and the cat looked like a family, Happy being the baby. The pair looked at each other, their cheeks becoming the shade of Erza's hair before Happy wriggled and made a calm purring noise. Everyone giggled whilst Natsu cuddled both Happy and (Y/N), her feeling light headed and sleepy. The dragon-slayer noticed this and placed her head against his shoulder, her half asleep, and rested his head on hers.
The salamander and requip mage soon passed out. However, Happy had woken up to see the guild looking at his owner and (Y/N), them both sleeping soundly in a warm embrace. Happy, the cat with not self-control said, "They liiiiiiiiike each." quietly as Erza let loose a few tears, seeing her sister happy, the happiest for a long while.
Everyone dispersed but quickly gathered one more when Natsu woke up, feeling (Y/N) shuffling in her sleep. He beamed brightly as the guild watched from behind in complete silence. Natsu slowly leaned down and pressed his lips against (Y/N)'s, to which he expected no response... Boy, was he wrong. He had woken her like a prince would a princess, and she softly pressed her lips against his in return. After they pulled away, a thud was heard from behind which made the pair turn around.
Mira was on the floor.
'Shit. We've been seen.' The pair thought in unison.
The pair were pulled from their thoughts by one another confessing their love internally, but Warren was mind reading again and announced it to the entire guild. Erza broke down into sobs, which was very out of character for her, and pulled her sister close.
Her sister returned the embrace and wiped away the tears, whilst Natsu was being warned by the guild and teased by the other dragon-slayers. Gajeel poked fun at how cringy Natsu was being with her, even though he padded over to Levy when his name was called, much like a loyal dog. Laxus said something about him finally getting laid and Wendy just kept beaming at Natsu, the only calm dragon-slayer.
Natsu heard the duel call of the Scarletts and immediately went over to see what they wanted from him. (Y/N) held his hand and shook slightly. "Natsu," Erza began. "If you hurt my baby sister, I will not hesitate to beat you into a pulp." Her aura was jet black, proving the sincerity of her statement.
Natsu replied with a 'yes, ma'am' and normal Erza as restored, hugging the pair. Their heads hit the breast plate and the newly formed couple winced in pain. "Erza, you've got to stop doing that! It hurts, nee-chan!" (Y/N) complained before doing the same gesture.
It caused Erza to fall over.
"I'll stop it!" She mumbled before rubbing her head and leaving Natsu alone with her sister.
"So," Natsu began. "How about a date, my armoured maiden?" He asked with a mouth splitting grin.
"I thought you'd never ask, vest boy." (Y/n) giggled as Natsu pulled her out of the guild hall... But not before Erza yelled after them.
"Be sure to use protection if you do anything, Natsu! I don't want to be an auntie yet!"
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Erza is a great big sis! Very protective, yet loving. Before people complain, I know Erza is OOC, but it works for the story, to me anyway. The next one is to be Gray Fullbuster X Reader, that will be up soon! Whilst I'm doing the 'after-one shot' bit, I will take requests but only after I have completed the ones I've planned.