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Ace and Luffy were discussing the benefits of bulk buying steak vs chicken in the meat aisle of Costco when they heard the intercoms chime.
“We're looking for a Sabo, blonde, in his twenties, wearing a tophat, with a scar on the right side of his face. Koala at the front is looking for you.”
They don't even discuss it, simply book it to the front of the store as fast as they could in Costco where they spotted their, (mind you) presumably dead brother getting chewed the hell out by a girl. Probably the Koala the employee on the intercoms talked about.
There was no doubt that it was Sabo, the giant scar and the fact he's older aside, he still dressed the same stupid way he did as a kid.
‘well it's great he's not fucking dead after all the shit his sperm donor did’ Ace muses ‘but he couldn't let us know he wasn't dead sometime in the past TWELVE YEARS?????’
Luffy doesn't even try to talk to him like a normal person, just slingshotting himself as fast as he can, tackling into their (TWELVE YEARS) previously thought dead brother with the world's loudest sobs.
“S-SABOOOOOOO!!!”
Their brother turns around in shock before he's tackled by 160 pounds of pure, wiggly rubber.
“Wha-”
Luffys inconsolable, a confused Sabo rubbing his back as he blabbers on about Sabo being alive. The only reason why Ace doesn't deck him immediately for not calling in the past TWELVE YEARS is because Luffys between them, and while Ace is willing to give into the cain instinct and punt them both, now's not the time. Instead he hugs him like he's trying to crush his ribcage and has to resist the urge to start bawling like Luffy himself.
Pulling away, but keeping him within grabbing distance, he observes his brother. He's clearly older, not dead and forever ten like they thought. A huge chunk of his face is gone from when he got blown the fuck up, but it's nothing in the face that his brother lived and he can't help but say the first thing that comes to mind “The scars super badass dude.”
“Thanks?”
Shaking his head, Ace gets back to the important things “Where the hell have you been for the past twelve years???”
“Um-”
“Did you decide you don't like us anymore??? I know you're a jackass but come ON! A letter or something!”
“Actually-”
He's interrupted by more of Luffys sobbing and Aces best attempts to put him in a headlock while Luffy winds himself around Sabo in increasingly intricate loops, much to everyone's horrified stares and confusion.
“you owe me twelve years of babysitting Luffy, you know how hard it was raising his ass without you-”
“You see I-”
“WHO THE FUCK ARE YOU PEOPLE???” A female voice yells. The woman who he assumes is Koala physically shoves Ace off of Sabo. She doesn't even try with Luffy though, who's currently somehow knotted himself into Sabo's coat and is working on replacing the band around his hat with himself. “Stop harassing Sabo!”
“Who the fuck am I? Who the fuck are you?! We're his brothers!” Ace snarls at her, getting back into Sabo's space, who instinctively puts a hand on his shoulder, as if calling him back. The gestures so familiar and it's been so long, he can't help the tears it brings to his eyes.
Her eyes widen with shock as he tries to repress his sniffles. Which. Terrible sign. Sabo's friend doesn't know about his brothers.
Sabo behind him makes a strangled little noise.
“I… I was trying to say I have amnesia. I don't remember anything before I was ten.”
Ace breathes in. Breathes out. Do not inflict violence upon your recently not dead brother. Be grateful he's alive. A fist of love will not fix this situation.
Spins around.
Ace is aware he probably looks like a shark in the water, placing a firm grip on Sabos shoulders, who is looking at him with growing apprehension and a strange sort of familiarity that's not quite there.
“its alright, it's not your fault you're stupid.” Sabo makes an offended noise at that, but Ace bulldozes on through “In that case we'll have to jog your memories,” it's a threat, and by the way Sabo's eyes widen it's clear Sabo realizes this. Ace grabs Sabo around his middle like a sack of potatoes, conveniently grabbing Luffy as well, and runs out the store. “ROADTRIP!!”
Luffy cheers and both of them ignore Sabos yells.
Koala makes a noise like a dying pig, and goes to run after them.
I made a doodle for this a while ago I was planning on making this a comic and gave up. 
The emb refuses to work so here's a link to the photo
https://cdn.discordapp.com/attachments/809712131159097404/1384033754238025728/IMG_8586.png?ex=68714221&is=686ff0a1&hm=4e09be0fc586d10b5d1c6babec8fc93caaeb924d8ab4ae763d078275cc19b53e&