Canon-Compliant, Fluff (and an attempt at Comedy)

"What're you studying this time?"

Tighnari opted to ignore the way Cyno was currently invading his personal space, paying no mind to the chin that was nestled in between his two ears. "Just studying some possible medicinal effects that this Inazuman mushroom could have." He hummed, fiddling with a sea ganoderma. "It actually has lots of similarities to jellyfish, including its bioluminescence and a heavy concentration of apoaequorin."

"And what does that entail in terms of medicine?" Cyno hummed, reaching his hand out to touch the specimen.

Tighnari swatted his hand away, setting the sea ganoderma out of Cyno's reach and picking up a pen. "For starters, if we could isolate the apoaequorin, it could be used to help treat dementia."

"That's good," Cyno mused, eyes wandering around Tighnari's hut. "Candace thinks that the village chief in Aaru village is showing some signs of dementia. I'm sure she'd love to get her hands on something to help him out."

"Oh, that man?" Tighnari frowned as he jotted down some notes on his paper. "I haven't seen him in a few years. It's such a shame, really; dementia is so undermined yet so common- you'd think there'd be more research done on it considering how commonplace it is." The forest watcher huffed, his pen movements becoming more aggressive to better match his tone.

Cyno nodded solemnly, closing his eyes. "Hey, now that I'm thinking about it- Do you know who else has dementia?"

Tighnari thought for a moment, his pen slowing down to a complete standstill. "No, I don't think so."

"Do you know who else has dementia?"

Tighnari's face scrunched up in confusion. "I already said no-"

"Do you know who else has dementia?"

"Cyno, why-" Tighnari's ears suddenly twitched in realization. "Oh you little-" The forest watcher ducked ever so slightly, launching himself up and ramming his head directly into Cyno's chin. "It's not funny!" Tighnari turned around in his chair, watching in disdain as the general mahamatra howled out, both from the pain of the impromptu uppercut and in laughter from his joke.

"Okay, okay," Cyno gasped out in between breaths as he calmed himself down, cradling his chin. "I'm sorry-"

"No you're not." Although it was nice to see his companion actually laughing for a change, Tighnari glared at him, crossing his arms and huffing in indignation at such a distasteful joke.

"Okay, maybe I'm not-"

Tighnari flicked his pen at Cyno, hitting him square on the forehead and promptly shutting him up. "You know it's not nice to make those kinds of jokes."

"It's okay, I'm allowed to." Cyno had finally calmed down from his fit of laughter, his face resuming it usual monotonous expression. "My father has dementia, actually."

The forest watcher's glare went away in an instant. "He does?" he asked, voice soft as his brows raised in surprise.

"Didn't I tell you this a while ago?" The corner of Cyno's lips fell down into a frown.

"Did you?" Tighnari scratched his head in confusion, trying his hardest to remember when Cyno had mentioned it- only to come up empty handed. "I'm sorry, I must've forgot." Now that he thought about it, had Cyno ever mentioned his family?

"It's okay." The moment Tighnari saw that shit-eating grin on Cyno's face was the moment he knew he had walked right into his trap. "He forgot too."

"Oh for fuck's sake, Cyno!"

Author's Note

Sorry this one is a tad bit short, I'm preparing for a halloween oneshot! This was one I wrote a while back for my friends because we're all immature and obsessed with this stupid joke, so I hope you like it as much as they did LMFAOOO

Word Count: ~500 Words