Archive of Our Own

Lucifer smirked, proudly browsing through the book and studying the various sections. “Interesting. You guys worked hard,” he told his brothers who were sitting together to review what they had made so far.

He stopped when he spotted a page that wasn’t filled enough yet, displaying a remarkable zone of emptiness, and he hummed. 

“Why is this empty? You know where Mammon is ticklish right?” Lucifer asked.

“Yes we know. Kinda. I just feel like we need to confirm it thoroughly so it has the most updated information,” Satan answered casually. “We can’t work with just guesses and assumptions.”

Lucifer eyed them. “Then why don’t you update it? All you need to do is tickle him and write the information you get in here. Does not seem like a big deal,” he said, continuing to check on the other sections.  

“I would, but not on my own. Someone needs to hold him down and assist or I’ll break or damage my nails,” Asmodeus said, waving his hands with his freshly polished nails. 

Leviathan shook his head. “What, tickle Mammon? If I do that he will kill me for sure. No thanks,” he said, shivering. Lucifer could recall some of Levi’s screaming laughter through the house, and he sighed. Without provoking Mammon, Levi was already a regular tickle target of Mammon himself. Hmm. He understood his fear. 

He turned to Beelzebub. “If I tickle Mammon he will never return the money I lent him,” Beel said, munching on his crisps. 

“You won’t get it back anyway,” Levi responded, and Lucifer was afraid he had to agree with that, but still understood why Beelzebub was reluctant. 

“I have better things to do in my life than tickling Mammon,” Satan argued as well. Belphie nodded. “Me too,” he said. 

Lucifer nodded, feeling annoyed at their lack of cooperation, and he made up his mind. “Well then. I guess that leaves me,” he said. “I will volunteer to do it,” he said. They all looked at him in surprise, and Levi shuddered again.

“Y-y-you will t-tickle Mammon?” Lucifer could see the shock on their faces. Especially Satan for example who knew how bad he could get.

“Poor Mammon..” Belphie mumbled.

“Do you need help, Lucifer?” Asmo offered, but Lucifer shook his head. “It’s fine. Besides, I have a thing or two to discuss with him, so might as well,” Lucifer said, wiggling his fingers and enjoying how everyone cringed at the sight of that.

“Hehe, ‘discuss’ he said,” Belphegor snickered.

“Good luck,” Beelzebub said dryly, and Lucifer smirked. “Thank you Beel. Can I arrange for you guys to come to Mammon’s room after noon? I’m afraid you could clean him up from the floor by then,” Lucifer said smugly, to which everyone cringed again. Ha. 

So according to plan, Lucifer made his way to Mammon’s bedroom. He was glad to catch him just in time as Mammon came out of his room, on his way somewhere.

“Where are you off to?” Lucifer asked, grabbing Mammon’s shoulder. Mammon cocked his head.

“Out? I was just about to -- hey!” Mammon whined when Lucifer started pushing him back into his bedroom where he came from. 

“You were about to have a talk with me. Good,” Lucifer said bossily, shoving him back inside and closing the door behind them. Mammon stumbled into his room and immediately stood ready in defense, looking hilariously uncomfortable about this confrontation with his older brother in his very own bedroom.

“What do you think you’re doing? I didn’t steal anything!” Mammon cried, and Lucifer chuckled at the funny fact that he didn’t even need to mention ‘stealing’ first. Mammon just said this automatically, since 9 out of 10 times any issue with him was about him stealing valuables at the House of Lamentation.

“I know you haven’t,” Lucifer said. “In fact. I came to return something to you,” Lucifer said. 

“Hands up,” he ordered. Mammon looked startled, gazing around his room for ways out, but Lucifer blocked his path very well.

“Up,” Lucifer warned. Mammon raised his hands above his head, and Lucifer snickered at how guilty this guy looked without having stolen anything.

“Not like that, foolish brother,” Lucifer said, snatching one of Mammon’s hands from the air and lowering it with its palm up. He placed a napkin in it. 

“I figured these are yours,” Lucifer said, enjoying the way Mammon’s eyes widened. ‘Diavolo’s napkins’ was written in scribbles on the paper tissues. Lucifer had caught a random student at the school with one, claiming these were valuables of the Demon Prince that were sold by a mysterious source.

If anything, any idiot would know that no sane person would really sell Diavolo’s napkins. All traces led to Mammon, the only one who would try such a ridiculous thing. It had taken Lucifer at least three days to track every student in possession of these stupid fake items and returned them their money.

“Oh, t-that?!” Mammon said, looking at the napkins and awkwardly shoving them in his back pocket. He giggled.

“Just a prank, honestly! It’s not my fault some people fell for it, they’re all nasty simps they are! Look, I wasn’t planning to keep the money okay? I justー”

“So you admit these are yours? And that you sold them for money? I just came to return these items to you, but looks like I made it in time for a honest confession,” Lucifer said, smirking when he caught the shocked look on Mammon’s face.

“Wha?! No- no hahaha what am I saying? Those things were what I would say if they were mine. Of course they aren’t mine, haha! Ha!” Mammon cackled. Lucifer nodded slowly and browsed on his D.D.D. He showed it to Mammon.

“Then, what is this?” he asked. Mammon gaped at the little screen. It was a picture Luke had sent in his group chat with Lucifer and Simeon. A picture of Mammon...... working on those napkins. He looked like he was fully concentrated, scribbling Diavolo’s name in gracious letters that were truthfully very similar to Diavolo’s actual handwriting, Lucifer had to give him that. But still, caught red-handed.

“No no noooo that stupid dog!” Mammon cursed, and Lucifer glared at him.

“You do not speak ill about Luke,” he warned. “And you do not disgrace Diavolo’s name like this. For this, and this alone, you will need to be punished,” Lucifer said, stepping closer to Mammon who backed away until he reached the pool table in his room. He bumped against it and fell clumsily, gripping the large furniture for balance, and Lucifer was quick to approach him and close the little space that was between them.

“Lucifer don’t you dahahahre! Don’t you dare!” Mammon shrieked when Lucifer shoved him onto the table with ease, grabbing him roughly and pinning him down. He reached for his sides and squeezed, his thumbs digging into Mammon’s twitching torso.

“Dare what? Say it,” Lucifer hissed, glaring at his guilty brother. Mammon laughed loudly and threw his head back.

“Ahahahs ihihihif! GAhhahha stahahap! Dohohon’t touch mehhee!” Mammon was struggling and kicking, definitely putting up quite the fight as he sent all of the balls on the pool table rolling. 

Lucifer remained unaffected as he trapped Mammon against the table and smirked, his fingers testing the ticklishness of his ribs. 

“GAHAHA!” Hmm, yes. Sides, a fair 7.8. Ribs, 8.2 on the scale of ticklishness. Lucifer stored the exact details of his research to write down later in the Mammon manual.

“Come to think of it, been a while since you had a proper tickle punishment,” Lucifer taunted. “You’ve been doing an awfully good job hanging from the ceiling lately.”

“THehehen hahahang me from the ceeeeeihahahaah!” Mammon cried, his body trembling under Lucifer’s weight. His arms flailed and waved, failing to hit Lucifer even once.

“Eight point eight. Maybe even a nine,” Lucifer said when Mammon shrieked very loudly as soon as his fingers inched higher and touched his armpits. Mammon shook his head and his glasses got lost in the struggle somewhere.

“Nohoho! Ihihiif they breheheak you gottahaha pahahay mehehe!” Mammon warned. Lucifer glanced at the glasses that had dropped to the floor, undamaged. He shrugged.

“Still going on about money? I can’t with you,” he sighed. Oh. He had been a little too distracted by studying the damage - or lack of damage - on Mammon’s fallen glasses, so his damn ticklish brother took his chance. 

“Ow!” Lucifer hissed when Mammon kicked him hard and tried to flee, running for the door, but Lucifer turned and grabbed Mammon’s jacket swiftly before he could get out of reach.

“Let go of meeeee! You’re such an ahahahass noohohoo!” Mammon roared when he turned and twisted so hysterically to escape that Lucifer ended up with only the jacket, but that did not stop him from capturing Mammon anyway -- jacketless. 

He smirked now that he had way better access to his torso with just a mere thin T-shirt protecting his tickle spots, and he threw Mammon on his couch so he could restart the punishment by scribbling all over his stomach.

“Ehehehee! Staaahahahp Lucehehe!” Mammon howled. A lot of ticklish reactions but less than the previous. 

“Seven,” Lucifer said out loud.

“Whahahaat?! I’m nohoot followihihing!” Mammon laughed, but he was ignored again. Lucifer’s hands went from Mammon’s stomach further down and he clawed at his hips. He remembered Mammon to be awfully ticklish there. He remembered correctly.

“AHAHAHAH! DAahahahamn you Lucifeheheher!” Mammon cried dramatically. Lucifer chuckled. Ten? Hmm, too optimistic? Maybe a 9.8 or something. He continued to write the Mammon’s Tickle Spots section of the manual in his mind, adding in details such as how Mammon was especially sensitive to rough tickles, specific squeezes and pinches with forefinger and thumb only, and how one should always make sure to pin down his legs. 

Lucifer gazed at his knee that was pressing down on Mammon’s legs to keep them from kicking him painfully again. Hmm. His legs...

“WAHAHAHH! No-- not theheere! Lucifeheheher aahahaha! P-plehehease!” Lucifer blinked in surprise. Was he going to beg? He was tickling his thighs right now. Hmhm. Very effective. 10/10, probably. He grinned wickedly, continuing to submit his bad brother to the relentless tickle punishment. 

“Not where? Hm? Here, perhaps?” Lucifer teased wickedly, pinching Mammon’s ticklish thighs non-stop. He had placed his own knee in between Mammon’s legs and pinned him down firmly, keeping him from protecting those hypersensitive tickle spots.

“I ahahahalready sahahaid I would! GAhaaha plehehease not thehehere!” Mammon howled. Hmhm. Lucifer nodded slowly. Enough? Anywhere else? Oh. He eyed Mammon’s socked feet. Lucifer rolled his eyes, he was getting tired, but he was a demon of pride and perfection. He was not going to finish his homework half-assed.

So, yes Mammon squealed and shrieked a lot when Lucifer finally left his thighs alone to grab his feet and tickle his soles. He even tried his knees as well, carefully noting every tickle spot of Mammon in his mind. 

By the time Lucifer finally ceased the tickling, Mammon was one exhausted wheezy mess. He barely had any laughter left.

“I w-won’t do it again. Spare mehehe,” he panted, still giggling softly while he lay weakly on his couch and ended up sliding to the floor, his arms wrapped around his heaving stomach. Lucifer stared at him. He had been so focused on memorizing the tickle spots that he had forgotten what Mammon wouldn’t do again.

He looked around the room. Oh. The fake Diavolo tissues had fallen to the floor, lingering there neglected and forgotten until Lucifer noticed them again, and he remembered that this was his excuse after all for the Mammon tickle research. He cleared his throat.

“Yes? Did you learn your lesson? Are you going to return the money to those poor people you conned?” he asked strictly, embarrassed that he, Lucifer - the Avatar of Pride - actually just caught himself getting a little carried away.

He just had to admit, tickling Mammon and hearing his hysterical reactions was more fun than he could remember. Not his proudest moment, but definitely fun.

“Yes. Spare me, brother,” Mammon wheezed again. Lucifer nodded. He was not going to tell him he already paid those people back for the stupid prank.

“Good.” And that was how he left him. He let Mammon recover on the floor and left the room, returning to the others who were curiously waiting at the end of the hallway as agreed.

“You guys are here. Good. Go pick him up off the floor. Bring him some water, and give him food,” Lucifer instructed. 

“We heard him...” Levi muttered in shock, staring with wide eyes. They all looked shocked. Lucifer smirked, feeling smug and victorious as he snatched the book that Asmo held in his hands, and he opened it perfectly on the Mammon’s Tickle Spots page. 

“Pen,” he commanded. Beel gave it to him, and with remarkable speed if he would say so himself, Lucifer scribbled down all the details of Mammon’s tickle spots. The others stared at him in surprise.

“Done,” he said, handing the pen and book back to Asmo. Asmodeus gaped at the newly added section in surprise.

“Woooow,” the others said in awe, and Lucifer took their compliments and surprised reactions to heart. While the others finally moved their asses and went to help Mammon, he resumed his way to his own room, with Mammon’s loud hysterical laughter still echoing through his head.

Yes, today was fun. Operation Mammon Manual...? Success.