Happy was bringing Natsu back to the Fairy Tail guild hall with Elise and Luna following close behind. Happy had just stopped Natsu from landing his last attack on Zeref because otherwise he would die along with him. Because of this, Happy's paws were burnt so they stopped by a small watering hole in a forest on the way back to the guild for him to tend to his burns.
"Happy, are your paws okay?" Natsu asked his exceed, concerned for him.
"Yeah they're fine, thanks." Happy said, dipping his paws in the cool water. Natsu sighed and averted his gaze down to his right arm where Igneel's tattoo used to be with Zeref's words echoing in his mind. Luna was sitting next to him on the grass and Elise next to her. She noticed him furrow his brows. She could tell something was bothering him.
"What's wrong? Something on your mind?" Luna asked Natsu who stayed silent for a moment before sighing.
"Heh, I guess I really can't hide my unease from you huh? I was just thinking about what Zeref said... that if he dies, I would die too." Natsu revealed his inner thoughts. Luna placed her hand on his hand. Her cool touch felt refreshing and made him feel more at ease and he relaxed a little. Happy, now done washing his paws, turned to Natsu.
"Natsu? You and me are friends forever, aren't we?" Happy asked Natsu who turned to look at him and smiled.
"Yeah we are." Natsu replied as Happy suddenly ran up to him and jumped into his lap and hugged him with tears welling up in his eyes.
"What's up?" Natsu asked Happy, placing his arms around his companion.
"We gotta find some other way, okay? I won't let my best friend die. You hear me?" Happy said, his tears starting to flow from his eyes.
"Yeah." Natsu said in a low comforting tone. Luna wrapped her arms around both Natsu and Happy.
"We will find another way to defeat Zeref without you dying. We... we have to." Luna said, starting to cry herself.
"I need you and so will your child. I want us to be able to raise a family together, make new memories, and grow old together. I can't live without you. You're my husband... my soulmate." Luna said through her sniffles, removing her hand from Natsu's shoulder and placing it on her belly. Even though she was pregnant, she wasn't showing it yet because she was only about one month in.
"We all need you Natsu, especially Luna. You can't just die!" Elise said, joining in on the group hug, jumping onto Luna's back. Luna and Happy just clung to Natsu and cried for a while before leaving to head back to the guild hall. During the flight back, Natsu went limp and quiet in Happy's grasp. They rushed him back to the guild hall's infirmary where Lucy, Brandish of the Spriggan 12, and the celestial spirit Aquarius were having a conversation. They were all soon joined by Cana and Porlyusica who heard all the noise and came to check out what was going on. Porlyusica examined Natsu and diagnosed him with a malignant anti-ethernano tumor. She explained that no one could remove it and that it would soon kill him. Happy clung to Natsu, bawling his eyes out while Luna and Lucy desperately tried to get him to respond while crying. Amidst all the chaos, Brandish said if they took the magic sealing shackles off, she could use her magic to shrink the tumor to a non-lethal size.
~Time Skip~
Natsu was laying in a bed in the infirmary recovering after Brandish shrunk his tumor. Lucy, Happy, Luna, and Elise went down to the dungeon to thank Brandish for helping Natsu. After that, Lucy went to the balcony to finish the conversation with Aquarius that had been interrupted when they brought Natsu in. Luna, Elise, and Happy went directly to Natsu's bedside waiting for him to wake up again. Lucy joined them shortly after. At some point, Lucy had fallen asleep while Luna, Happy, and Elise stayed awake by Natsu's side. But suddenly she was woken up by a foreboding feeling.
~Time Skip~
There was a lot of commotion coming from upstairs in the guild hall followed by this weird dark-colored mist that filled the area. Suddenly, Lucy's celestial spirit Horologium appeared around Luna, Natsu, Lucy, Happy, and Elise. It was super tight with everyone nakedly crammed inside the Pendulum Clock spirit. When it was safe, Horologium let them out. Luna got dressed again and Lucy activated her Star Dress: Taurus Style. The girls and Happy went to the main hall of the guild to see what was going on. Elise stayed behind to look after Natsu. When they got there, They saw one of the Spriggan 12 Jacob Lessio threatening Mavis. Without thinking, Lucy and Luna attacked Jacob and kicked him from behind, saving the First Guild Master. Happy looked around the guild hall and asked where everyone went. Mavis explained what had happened and that if they didn't stop this guy, their guild mates would die. Lucy immediately changed her Star Dress form.
"Star Dress change! Time for Leo Style!" Lucy said as she changed to her Leo Style Star Dress. Luna's icy cold aura grew, preparing herself for battle. Jacob seemed confused as to why there were still mages left behind after he cast a teleportation spell that covered everyone in the guild building.
"The stars were looking out for us!" Lucy and Luna said.
"Aye they were!" Happy chimed in.
"Well if you vanished with the rest, you'd avoid what's about to happen." Jacob said before moving his gaze to Mavis.
"Listen up ghost. I'm changing the terms of the deal. I think it'd be more formal to tear these girls to pieces until you've made up your mind. And if the feeling strikes you, I suggest you surrender, otherwise they might just be pretty blonde and blue heads!" Jacob said as he threw two throwing knives at Lucy and Luna.
"Lucy, Luna! Get out of the way!" Mavis yelled as Lucy braced herself and Luna attempted to form an ice shield in front herself and Lucy, but the knife was traveling faster than she could fully form the ice shield. Suddenly Natsu ran in front of both of them, shielding them from the knives which struck him in the arm and started melting from his heat.
"Even if they were just heads, they'd still be my wife and friend. But since you threatened them like that, I'm gonna have to turn you to a pile of ashes!" Natsu said as his fiery aura intensified. Jacob seemed frustrated and everyone else was relieved.
"Natsu!" Mavis exclaimed happily.
"I knew you'd be okay!" Happy said with tears of joy streaming from his eyes.
"Natsu you're here! Thank goodness you're okay!" Luna said with relief.
"I hope you had a nice nap." Lucy said with a smile on her face.
"Oh yeah. Now I've got a fire in my belly! Let's go!" Natsu said, getting ready to charge at Jacob.
"Right!" Luna said as she formed ice gauntlets and boots around her hands and feet. She and Natsu lunged at Jacob landing a fiery and icy kick, but he blocked their attacks with his arm.
"I'm fired up!" Jacob said as Natsu got upset.
"Hey man, don't go stealing my line!" Natsu said as Jacob used his other arm to send Natsu and Luna flying backwards. But they kicked off the support pillar to launch themselves back at him, punching him in the stomach. Jacob then grabbed both of them and slammed them into the floor of the guild hall, making a hole in the wooden floor.
"And would you stop tearing up our damn guild hall?! Huh? What the-? He disappeared." Natsu yelled angrily at Jacob who had suddenly vanished. Lucy asked Luna and Natsu if they could smell him, but they couldn't. It was like his existence was gone completely. Suddenly he appeared behind Natsu and elbowed him on the head then disappeared again. Mavis explained what his magic was right as he reappeared by her and placed his foot on her head. He told them that he could also see invisible things like Mavis's spirit while applying pressure to her head with his foot.
"Don't you dare touch her!" Natsu yelled angrily.
"He's not going anywhere. He's just using a camouflage spell which means he's still here! Loke!" Lucy shouted as she summoned her celestial spirit Loke.
"Lion Radiance!" Loke said as he radiated a bright light from his body which revealed Jacob's position.
"I see you." Loke said as he went in to attack Jacob, but he countered his attack and punched him. Loke was sent flying back into one of the tables.
"That hurt. What'd you do?" Loke asked Jacob who scoffed and cast a strange spell that hit Natsu, Luna, and Lucy. He explained the things his kind of magic allowed him to do with a menacing look on his face. Then he acted like he was going to cast a spell at Natsu who put his arms up to block it but it hit Lucy and Luna instead.
"Stop, you're hurting me!" Lucy cried out in pain.
"It hurts! It hurts!" Luna screamed as pain shot through her body from Jacob's spell.
"Luna! Lucy!" Natsu raised his voice out of concern for the girls.
"You blocked because you thought I was throwing something at you right? I was actually cracking the whip behind me." Jacob said with a dark smile on his face.
"Well you can watch me punch you!" Natsu yelled angrily at Jacob as he charged at him only for him to vanish again in front of him. He appeared behind Natsu and grabbed his head firmly.
"Natsu!" Luna and Lucy both shouted.
"If you want to know what hell's like, I'd be happy to show you first hand." Jacob said to Natsu before shoving him down to the ground and restraining him.
"Pay close attention to the young ladies in front of you." Jacob said as both Lucy's and Luna's clothes started to disappear. They both knelt to the floor covering themselves out of embarrassment. Loke gawked at her and Luna's nearly naked bodies.
"Hey wait! What's going on?! Why me?!" Lucy said as Luna shot her a "seriously?" look.
"Hey! It's not just you y'know." Luna said to Lucy.
"How do you like that? I made their clothes invisible." Jacob said, seeming proud of himself. Natsu on the other hand seemed unimpressed by his little trick, though he was getting a little aroused. Not because of seeing Lucy in her undergarments, but because Luna was also in her undergarments which consisted of black lace lingerie. It was then that he realized his attraction to Luna was much greater than his attraction to Lucy.
"Cut it out! Turn them back to normal!" Lucy shouted at Jacob.
"Uh how about making them invisible forever?" Loke asked Jacob as his blush just got brighter and brighter.
"Okay, I'm closing your gate!" Lucy said as Loke was returned back to the celestial spirit realm.
"Now this is hell, don't you think?" Jacob asked Natsu.
"Yeah, it is for me!" Lucy said shaking her fist in protest. Luna just said nothing, her blush just darkening because she was forcefully exposed to Natsu. He was staring at her, a light blush forming on his face as well. Heat started to pool in her core.
'Why am I getting turned on from this? Is he getting turned on too?' Luna thought to herself.
"You've got a pretty weird concept of hell, buddy." Natsu pointed out.
"What do you mean by that mate? There's two half naked girls squirming in front of you. Don't you feel tormented, embarrassed? I mean do you look away, or not look away? It has to be hellish!" Jacob said.
"I don't know. It's not like they wear that much anyway." Natsu said blatantly.
"I wear clothes all the time Natsu!" Lucy said, clearly offended by his comment. Luna on the other hand wasn't offended at all.
"So you're saying this doesn't bother you in the slightest?!" Jacob asked, seeming surprised at Natsu's lack of reaction.
"I'm a little confused here. What's wrong with your face?" Lucy asked Jacob. His head was turned to the side, his eyes were shut tight and a pink blush dusted his cheeks.
"It's obvious! I mean, I can't just look at you like that, can I? This technique is like a double edged sword because it puts me and my target in an incredible amount of anguish and torture." Jacob said, not daring to look in the girls' direction. Lucy and Luna looked at him completely flabbergasted. Suddenly Natsu got a goofy devilish grin on his face as he snickered mischievously.
"No Lucy, Luna! Please don't take your underwear and stuff off too! Oh no, don't make us see your boobies!" Natsu suddenly yelled, making Jacob twitch.
"I think we should play along with him." Happy whispered to Lucy and Luna.
"Yeah, I guess you're right." Lucy said reluctantly agreeing with Happy.
"Oh I'll play along all right." Luna said with a smirk.
"My God! What kind of sick people are you?! You'd really strip in front of us?!" Jacob raised his voice, steam practically coming off his head from his brain short circuiting.
"Oh no you guys are butt naked!" Natsu said.
"Who cares? It's just skin. I'm not afraid to show off what I got." Lucy played along, despite panicking just moments before. She was still covering herself up though, but it didn't matter. Jacob's eyes were closed. Luna on the other hand actually uncovered herself since the only ones whose eyes were open were either girls (Lucy and Mavis), the two exceeds, and Natsu who was her husband.
"Like what you see?" Luna said while doing sexy poses in front of Natsu whose blush started to darken.
"It's all so indecent!" Jacob said, shaking his head back and forth, trying to keep his composure.
"Holy crap! These are super soft!" Natsu said as Luna got right up in his face, lifted up her invisible shirt and black lace bra and pressed her bare boobs against his face. Natsu latched onto one of Luna's breasts and began to suck on it.
"Oh God, don't stop Natsu~!" Lucy said not having moved at all from her spot on the floor.
"Ah Natsu~! Please... keep going~!" Luna breathed out of actual pleasure.
"You're all deprived and terribly lewd!" Jacob said, barely able to take it as his imagination ran wild which was not too far from what was actually going on except it wasn't a threesome like he was imagining.
"Enough, I'll just skip straight to the killing!" Jacob said as he let go of Natsu and raised his finger, making the girls' clothes visible again. Natsu released Luna's breast and she quickly pulled her shirt and bra back down and got ready to attack along with Natsu and Lucy. As soon as Jacob opened his eyes, the three of them got ready to attack.
"Regulus!" Lucy started.
"Fire Dragon!" Natsu yelled.
"Ice Dragon!" Luna shouted.
"Combined Kick!" They said together as all three of them kicked Jacob in the face, sending him sliding backwards almost all the way across the guild hall. He was very angry and the four of them engaged in battle. Now that the girls' clothes were back to normal, he started to overpower them in hand-to-hand combat. He then stated that he was going to start killing their guild mates one by one in his pocket dimension. But then Lucy told him that he had also captured Brandish and Marin as well. Then he checked his transport and released his two comrades. Natsu noticed that another Marin had appeared which was really Lucy's celestial spirit Gemini. Lucy then uses Gemini who uses Marin's magic to free their guild mates. Makarov then grows to his giant form and punched Jacob out of guild who skidded across the lake next to the guild. Then he threw Natsu and Luna after him. Natsu's heat evaporated the water of the lake. Luna activated her dragon force form and flew way far ahead and high up. Natsu's fire burned even hotter as he powered up for an attack, burning up Jacob's clothes as he got closer to him.
"Fire Dragon King's Destruction Fist!" Natsu yelled as he threw a powerful fiery punch at Jacob and sent him flying towards Luna.
"Ice Dragon Queen's Judgement Hammer!" Luna shouted as she formed a giant war hammer made of ice and heavily struck Jacob once as he flew at her from the force of Natsu's attack. The force hurled him directly into the exposed dry lake floor below at an incredible speed. He landed head first with a huge thud. The only thing visible after the dust cleared were his boxers and twitching legs sticking out of the dried up lake bed. Jacob was finally defeated.