Pairing: Gruvia (Gray x Juvia)

Other characters: Lucy Heartfilia, Natsu Dragneel

Summary: It's Halloween party! Everybody thought that it's going to be great, but what if Gray would flirt with other girl-friend instead of Juvia?!

Rating: K+ (little making out, language)

AU: modern world

Word Count: 1,900

"Gray-sama! Come here!" Juvia was calling her boyfriend to where she and their friends were standing.

They were at Halloween party which their neighbors, Lucy and Natsu, organized for close friends.

Dragneels are friendly married couple who live literally under Gray and Juvia. They are married for three years already and 5 months ago their son, Iggy, was born. Marriage is comfortable with the role of parents, but it's definitely hard to be responsible adult. Gray can't even imagine how difficult it is, so he admire his friends. He is full of wondering to her girlfriend, too, because of her work with children in school. Despite many problems with them, she is always happy when she is coming home.

Natsu from the very first day, when Gray and Juvia moved in to their block, was disturbing dark haired man and making jokes, but in general they are good friends and they used to go for a drink, but now Natsu is a parent, good parent. Despite Lucy always have to rescue him when it comes to changing diapers. But Iggy loves his father very much, because Natsu is type of cool father. Lucy balances everything; she is neither cool nor crude. They are funny and strange family, but after all they are together.

But now they're on a party, yeah? Having fun is important also in adult's life.

"Hi, Lucy, how are you?" Gray asked, walking towards them. Music was pumping loudly, but woman and others heard him.

"You didn't forget 'bout somebody, ice bastard?" pink haired man shouted like always when Gray was ignoring him. His wife laughed nervously, knowing what's coming.

"I don't think so, fire brain." he smirked. They always are offending themselves, but it's clearly friendly. At least, they think it is like that. Oh, and why ice bastard and fire brain? Because Gray's a cold guy and Natsu's a warm guy. Simple, yeah?

"Gray-sama! Don't be mean to Natsu-san!" his girl reprimand him, but no effect on neither Gray nor Natsu.

"You stupid frozen freezer, fight me!" second one shouted louder than before. Couple of guests even looked into their direction and then his wife can't hold it out and she pinched her man's ear that strongly that he had to lower to blonde's level. Then she whispered to his ear.

"If you don't calm down, I swear, you are going to sleep on couch until Iggy did not grow up. Not to the rest of your life, because with first option, you'll know that someday you'll return and you'll wait and wait, and wait, and wait." Natsu swallowed. "So, that would be more painful. Got it, honey?" she smiled sweetly.

"Y-Yeah, Luce…"

"That's good!" she widened her smile and after secs turned to her girl-friend which was a little scared after hearing Lucy's words. "Juvia-chan, how are you?! Is Gray treating you nice?" blonde hugged other woman.

"Y-Yeah, Lucy-san, everything's good! Juvia is happy with Gray-sama." she looked at him and smiled. "Really happy."

"So I'm happy with you, sweetie!" Hug. Again. Nah, girls. "And I'm glad both of you found time to come over!"

"No problem, Lucy-san, thanks for invite!" blunette smiled and took her boyfriend's hand while both men groaned at how their women were excited about meeting. Gosh, they live practically next to each other, so they see themselves like… every day? "Oh, you curled your hair?"

"Yeah!" she laughed. "I thought it would fit to my costume. Now we're like twins!" both of them laughed at Lucy's comparison. Then Gray changed topic and asked.

"But I am wondering, what did you do with Igg?"

"He's at babysitter's…" Iggy's mother responded, but his father has better answer.

"He's in his room."

They said in the same time, but… why their answers are… different? Like, totally?

"He's where, Natsu?" Lucy said between gritted teeth. Really, she can't understand her own husband sometimes.

"He's in his room." he repeated and that was flash point. "Where should he be?"

"Natsu Dragneel! You are dead already!" she began to walk towards little boy's bedroom. Man followed her, mumbling something about what she is doing. It's obvious that Iggy is in his room, so what this woman is doing?!

Leaving them with their own problems, Gray and Juvia stayed where there were and keep waiting for their friends, but…

"They are not going to be here quickly, right?" he asked, knowing the answer at the same time and tightening grip on her hand.

"Yeah, Juvia guess…" she can't finish; she got distracted because of Gray's second hand which trailed down her waist to hip. He pressed at her body firmly and woman's body rest on the wall behind them. She was surprised, Gray wasn't the type of guy who was showing tenderness in public.

"G-Gray-sama?" he kissed her in answer, gently sucking her lip and sweet moan escaped her mouth. It's so nice feeling, being unexpectedly kissed by your lover. But she has to broke kiss, so she took her lips from his and delicately pushed him away. "Gray-sama, people are looking at us!"

"Let them." he wanted to kiss her again, but she refused.

"When we come back home, Juvia will give her Gray-sama anything he wants." she smiled. "So be patient." he groaned at how his girlfriend is driving him crazy. She's everything he needs right now.

"Fine, but anything?"

"Anything." blunette gave him quick peck on lips and pushed him completely. In the same time, she saw Gajeel and Levy which just arrived to the party. It's obvious that she wanted to say "hi" and chat a little. "And now, I'm going to talk with Gajeel-kun and Levy-san, if I have your permission." she said, joking a little.

"Nah. Go. I will stay and wait. Greet them." he pushed himself against the wall and crossed his arms. He liked to do it. Kissing Juvia was nice also. But nooo, she had to chat with Gajeel.

"But you are sure that you will recognize Juvia?" she eyed him. "It's costume party, Gray-sama!"

"Always, Juvs."

After fourty minutes, Gray realized that he lost Juvia in the gathering of faces. Fuck, what now? He was doing circles between people and asking about his girlfriend, but non, non, non.

Meanwhile, he learned that Lucy and Natsu already made it and they are going to be okay. Oh, and that idiot dressed up their son as a dragon. Blonde at first irritated, but after a while she laughed at how stupid and at the same time funny her husband is.

Returning to Gray, he finally found his Juvia. She was standing near the same wall they were standing some time ago. There were dark, but he recognized her because of her costume and wavy hair. Simple, but worked, he guessed.

He decided that he should surprise her. Gray thought that's great idea, so he came from behind to woman and grabbed her hips, so he could hold her tight. He also pressed his lips to her neck and began to kissing and sucking. It feels so good hearing silent moans escaping her mouth. But something was different. Second ago man found out what.

"Mmm… Natsu…"

Natsu? That fucking bastard?

"Don't tell me… Lucy?!" she jumped like she was burning.

"G-Gray?! What are you…?!" and then she heard her husband who interrupt her.

"What the holy fuck is going on here?!" he was waving his hands like stupid. "What are you doing with my wife, ice cube?!" Natsu was so pissed of. How dare Gray was to touch something which was his?!

"Oi, it's not like that, Natsu!" accused man shouted, trying to defend himself.

"So what the fuck is that, huh?! Lucy!" oh gosh, he was going to erupt.

"It was mistake, I think! I and Juvia have the same costumes, Gray just made mistake! That's why he was kissing my…" blonde can't finish, because Juvia just came, ideally to hear her.

"Gray-sama was kissing what?" Gray frozed. Now he's in ass. Dark ass. Aaand Natsu has to interfere and sink his ship more, of course.

"They were making out! Making out!"

"No, Juvia! It's not like that!" Lucy tried to appease situation, but this was impossible with her pissed of husband and oddly calm Juvia. "Gray, you're not going to say something?!" she turned to him, now pissed, too.

"I…" he didn't know how to defend himself.

"You don't have to." blunette began to shake a little and tear trickled down her cheek.

"Juvia…" Gray mumbled, but she just ran away, leaving them, confused.

"Fuck." he cursed and sit on chair near them, covering his face with hands. It's stalemate for him.

"What are you waiting for, idiot?" he heard Natsu and he can't hold it to look at him. "I know this was mistake, but Juvia doesn't."

"Wait, you know?!" Lucy surprised, but man ignored her.

"She's not going to forgive me. You know her."

"Because I know her, I know she will. Just don't sit at ass, chase after her, stupid!" he was still trying to convince Gray to his version and he finally did it. Gray stood up, because realization hitted him. Juvia loves him, so she is going to forgive him everything. Despite that he still didn't explained to her this situation.

"Thanks, man." he stood up and patted Natsu on arm. Then he chased after his trembling girlfriend.

"You really knew?" Lucy asked.

"Of course. You think that I would believe in you cheating on me with Gray?" pink haired licked his lips.

"You're stupid, you know?" she breathed with relief and smiled a little.

"I know."

"Juvia!" Gray shouted, seeing her standing at staircase in front of Dragneel's apartment, crying a little.

"What Gray-sama wants?" blunette asked, wiping tears from her cheek and turning around to face her boyfriend. He walked to her close and tried to took her hand, but Juvia refused. "No. Not this time."

"Juvs…"

"No. Not Juvs." she again began to cry. "Why? Why did you do something like that? With Lucy-san?"

"It's not like that!" man made a step away and sinked hand in his hair nervously. "I thought it's you. When I realized I am wrong, I jumped away, but then Natsu came, made a scene, and… you…" he can't even find words which would rescue him.

"Mistake?" she surprised. "You thought that Lucy is Juvia?"

"Yes! I'm trying to tell you that since couple of minutes!" he told, still in nerves, but he gathered himself to walk slowly to her. "Really, Juvia… you know that I would never cheat on you or do anything to upset you."

"But you said that you would always recognize Juvia!"

"Can we say that our always starts today?" he laughed a little and Juvia can't hold it out and… also began to laugh.

"We can. But never do something like that second time! Juvia thought that she is going to die." women hugged him and he was in heaven right now.

"I know, Juvs." Gray kissed her forehead delicately.

"Can we now return to the party? I think Lucy-san and Natsu-san are waiting for us." she wanted to let him go, but he doesn't want that.

"Moment." he hugged her harder. "Stay like that for a while. I need that." man caressed his girlfriends back gently. She was really happy because of this turn of events.

"Always, Gray-sama."

AN: I thought that I would update it like in couple of weeks, not couple of days HAHA. It's late Halloween fanfic. Very late, but I decided to upload this 'cause to be honest, only Halloween thing here is that they are at Halloween party...
I changed title couple of times. At first chapter was called Swap and then Slap (I wanted to make Juvia slap Gray, but I refused, it doesn't fit her).
I hope ya enjoyed it! See you soon!