Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11724510.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Final_Fantasy_XV
  Relationship:
      Gladiolus_Amicitia/Prompto_Argentum
  Character:
      Gladiolus_Amicitia, Prompto_Argentum, Noctis_Lucis_Caelum
  Additional Tags:
      Alpha/Beta/Omega_Dynamics, Mating_Cycles/In_Heat, Dubious_Consent, is_it
      tho..?
  Stats:
      Published: 2017-09-06 Updated: 2018-02-10 Chapters: 2/4 Words: 3849
****** I Know That Guy ******
by Daeva_Labeija
Summary
     Meeting somebody while on the verge of a heat usually has ‘one-time
     thing’ connotations. Prompto and Gladio couldn’t really afford that
     when they are both so close to the same person, Noctis. This is how
     they tiptoe around the fact that they’re fuckbuddies to the prince of
     Lucis. Canon-divergent, Brotherhood era.
***** Secret Part 1 *****
"What's wrong? Didja bomb the test?" Prompto chirped from behind Noctis, who
seemed at the brink of throwing his light gun at the arcade game's screen. Game
Over You Died, it said, all in red and dripping lettering like blood. The
prince felt even more miffed.
Noctis didn't bother with a reply to his friend and instead bent down to swipe
his card on another game. At least, that's what he meant to do before
somebody's hollering made him freeze and step back.
"Shouldn't you be in school?!" said a gruff voice.
"We were just heading home!" Prompto reacted right away, voice sounding like a
whining puppy. He nearly threw his own and Noct's bags out of fright. Noctis
couldn't blame him. Gladio was huge. It didn't help that he looked all sorts of
furious. "...wha- wait, it's you!" Prompto interjected after a while and
suddenly his face was a bright red. He was chewing on his bottom lip and
fiddling with the hem of his shirt and just like that, Noctis knew there was
something up.
Noctis turned to look from his best friend to Gladio, throwing a more pointed
stare at his shield. "You know each other?" Noctis asked and was awarded with a
new sight - Gladio looking bashful.
Whatever this is, Noctis figured that his irresponsibility during exam week
could be swept under the rug in the meantime.
===============================================================================
                                  First Time
===============================================================================
They didn’t even really know each other.
Gladio was simply alerted of one blonde that always seemed to be with the
prince ever since he started his first year in high school. He and Ignis knew
that it was peculiar for the prince to hang around other people if he can help
it. Ignis told him that as his sword and shield, he had to look into the
matter, even if he knew Noctis wouldn’t be fond of him suspecting his friend of
ill intentions.
‘His name is Prompto Argentum.’ He remembered Ignis telling him. He thought it
was a foreign-sounding name.
It was after school on a Friday when Gladio spotted this Prompto kid seemingly
distressing the prince.
They were in a crowded arcade, arguing. From his outside view of the arcade,
the bodyguard couldn’t decipher any of their words. However, it seemed that the
prince was upset and the blonde was backing away from him.
Gladio initially thought nothing of it, regarded it as a common spat between
teen boys. His opinion changed when he saw the blonde slap the prince’s hand,
then turn his heel, and ran off with pretty impressive speed. He saw Noctis try
and come after him, but the blonde’s speed disheartened him.
Gladio thought Prompto might have stolen something from the prince. He could
sense something terribly desperate from the blonde’s sudden actions.
And like a good bodyguard, he came after the prince’s attacker.
Gladio was led to a small house in a less-appealing part of the city. Thinking
of how the blonde ran many blocks, without stopping, made Gladio suspect that
there was something dire about his rashness.
‘Did he realize that I was tailing the prince?’ The thought crossed Gladiolus’
mind. If that were the case, then he really did need to talk to Prompto. There
was no way some ordinary high school brat would be able to sense Gladio from
far away.
‘Did he intend to cozy up to the prince to get a chance for a better life?’
Gladio kept juggling potential motives as he watched the blonde struggling to
open his front door. From afar, Gladio could only guess why Prompto was half-
doubled over and trembling.
Gladio glanced at the surrounding area to check if there are other people
around. It seemed that Noctis’ friend lived in a relatively deserted place. He
spotted a faded street sign on a nearby corner and the information there
enabled him to connect the dots. Gladio figured out that he was most likely a
refugee. Recipients of state aid were given housing in this neighborhood. As he
mulled over Prompto’s background, he heard shuffling coming from the blonde,
creaking and then a door slamming shut. By this point, the bodyguard wanted to
check in on the kid for two reasons: one, ask about what the problem was with
Noctis back at the arcade and two, ask if he’s physically and mentally healthy.
He was still a crown citizen, after all. Gladio has still sworn to never let
any get in harm’s way.
But, for all his training and experience, Gladio never anticipated that he
would be lured by a kid like Prompto. The moment he opened the front door, a
rich aroma flooded his senses. His grip on the doorknob tightened so much that
it squeaked. Gladio struggled to keep his head clear and his judgment in tact
but the allure of that sweet scent promised him things he can’t pass up.
Next thing he knew, he was following a trail an omega in heat had carelessly
left. Gladio groaned at the thought that the omega didn’t intend any of that.
He was courteous enough to let his pheromones spill only when he was in the
enclosed space of his home.
Gladio’s legs seemed to move on their own, going in a slow but deliberate
line past the living room, through a short hallway, leading to a slightly-ajar
bedroom door. The smell alone told him that a sweet treat waited on the other
side.
Gladio’s hand shook as it reached to push the door open. His higher faculties
tried to drag him away from there. The promise of an omega in heat kept him
there. The pulsing in his cock gave him all the motivation to enter the little
bedroom, where his prize awaited.
The blonde was on his side, loosely curled into a ball. Within his fist was a
pink dildo, jelly-like and pliant. Little whimpers and sighs escaped his throat
and his eyelids fluttered open and shut, his eyes out of focus the whole while.
His free hand tugged at his uniform’s tie. Gladio found him surrounded by many
plump pillows and chocobo stuffed toys on his bed. He could tell that the omega
barely recognized his presence.
Gladio’s eyes scanned the tiny things scattered around the blonde. He spotted
lube and another jelly dildo, green this time with little rubber spikes and a
funny face. A balm of some sort was left uncapped near the omega’s face. Gladio
suspected it emitted artificial alpha scents. There were pills of varying
colors and shapes. It seemed the blonde had too little control of his own
movements that he spilled his medication.
“Even if you take these now, your symptoms won’t subside.” Gladio offered as he
watched the blonde grasping at a pill.
“Ah?” The blonde was alerted and a look of fright crossed his face. “Who th-…
who the hell are you?!” He threw the pink dildo at Gladio. The bodyguard didn’t
bother to swat it away and just let it bounce off his chest. He kept watching
him, trying to gauge whether the blonde was okay, which only further scared the
omega.
“Wh-what are y-you doing here?” Gladio thought it was pitifully adorable how
the blonde stammered. To that he cursed his biology.
“I’m telling you that your heat won’t let up even if you take those pills.”
Gladio explained, voice tempered like steel. He himself was surprised at how he
was holding up. “You’re supposed to take them a day or so before your actual
heat. Didn’t your parents teach you that?”
The omega only pouted in response. He looked like he was about to say something
but instead his lips quivered and his eyes watered. Gladio groaned at the
sight. There were two ways to help this crown citizen and Gladio’s head is too
muddled to notice the difference between helping him as a guard and helping him
as an alpha. A voice in his head mocked that he’s only helping himself.
Prompto was scared enough about the situation that he was panicking. His
breaths were quick and shallow and he looks just about ready to burst into
tears. He still isn’t used to his heats. That, plus the fact that there was a
scary-looking stranger in his house made him more terrified.
“Y-you should g-get out!” Prompto said, unaware that his shaky tone of voice
affected Gladio. “I’m about to-… uhh…”
Gladio could see him fumbling at the scattered pills on the bed. “If you take
those when your heat is already starting, it will only get worse.” He called
him out in a much harsher tone than he intended.
“Aah!” Prompto whimpered in response, automatically feeling the alpha's
assertion on him. He let go of the pills like they were lit embers and even
showed the palms of his hands to the alpha, just to prove to him that he did
what he was told. Then his shaky limbs put a barrier of pillows and toys
between him and Gladio.
“Aah… alpha… hnn…” He mumbled repetitively. Prompto had never experienced being
in the presence of an alpha at the start of his heat before.
Gladio’s eye twitched at the blatant show of fright. He wasn’t used to men
acting like this. Probably because he’s never encountered a male omega in his
life.
“Were you running away from Noctis because of your heat?” Gladio asked although
by this point he was almost certain. “I guess I should thank you for being
considerate. Noctis is a young alpha. He wouldn’t have been able to control his
urges had he smelled you.” Gladio could only imagine what the headlines would
be if the Crown Prince of Lucis was ever caught in an alpha trance in public.
“Noctis..? Alpha too?” Prompto’s breath hitched at nearly every syllable. His
heat was ready to hit him hard and Gladio staying around only hastened that.
“You didn’t know?” Gladio thought it was too weird for an omega not to smell
that. “Come on… you had to know that.”
“I… I’m…” Prompto stammered and Gladio sighed as he saw those teary eyes
sparkling again.
Maybe he was just stupid. Maybe he was still insensitive to scents. Gladio cut
the kid some slack. And he was aware of the fact that his alpha instincts
contributed majorly to that. Right now, his thoughts centered on consoling the
omega.
“Calm down.” Gladio’s voice was a rumble in Prompto’s head, affecting him
enough that he gradually slowed his hitched breaths.
The alpha plucked away the pillows one by one and then rested his hands on the
omega’s shoulders. Gladio felt the fabric of Prompto’s uniform with his palms.
He rubbed incessantly while mentally arguing with himself whether or not it
will be good to take off Prompto’s blazer.
Blue eyes looked up in a mix of fright and arousal. “Sh-should I..?” Prompto
felt compelled to undo the buttons of his shirt, sensing that that was what the
alpha wanted.
Prompto pulled his tie loose, while still looking at Gladio to check if what he
was doing made the alpha happy.
"Do what you want."
***** Secret Part 2 *****
Chapter Notes
See the end of the chapter for notes
Gladio let out a sigh, strangled from the tension in his gut and the awareness
that if he lost a smidgen of control, what he's doing right now would be
considered abuse of power, rape even.
"Listen, I know you're not very focused right now but you have to keep talking
to me." Gladio managed to say without touching the omega any more apart from
slightly squeezing his shoulders.
Prompto's expression looked like nothing registered in his mind. He was staring
at Gladio like he was one of the Six, stars in his eyes and mouth slack and
wanting.
"I already know that you're a refugee. You don't need to hide that from me."
Gladio thought of the possible provinces that Prompto came from. It was a
dedicated effort just to stymie his instinct to press against the omega's body.
His freckled skin made him think of Duscae, his blonde hair Tenebrae or most of
the Imperial continent really. But then again, it's irresponsible
to ascertain anything just through his outward appearance. The fact that he's a
male omega just screamed Niflheim. But Gladio won't assume.
"You know that Insomnia only has a 3% omega population, right?" Gladio shook
the blonde's shoulder a bit to get him to pay attention to his words.
Prompto only responded with a soft moan as he squeezed at Gladio's thick
forearms.
Gladio looked down and saw how dainty Prompto's fingers looked against his
tanned and tattooed arms, distracting him for a good while.
"Absolutely 100% of that omega population is female here in Insomnia." Gladio
said with a shake of his head. "I'm a member of the Crownsguard, Prompto. I'm
trained to comfort omegas in the event of an unexpected heat." That part wasn't
completely true and it was more a way to convince himself that he was still in
control of the situation.
"But I can't help you about something I don't know. The knowledge I have is
restricted to female omegas." He kept urging. "Where are you from, Prompto? If
I know, I can look it up or ask someone more informed than me about how to take
care of you."
Prompto looked like he was at least half-aware of the situation, if the sorrow
in his eyes revealed anything. "I'm sorry." He pleaded. His hands moved from
Gladio's arms to his own, hugging himself.
"I know I'm not normal." Tears welled up in Prompto's eyes and Gladio
automatically let out a scent to soothe the omega.
"I'm sorry, I'm not from here." Prompto shut his eyes and Gladio felt a tinge
of rejection flavoring the omega's scent.
"I'm not going to stop helping you just because you're a refugee, Prompto."
Gladio said. When he saw the tears flowing, he couldn't help but pull Prompto
up to sit on his lap and wrap his arms around him.
Gladio figured that he can calm Prompto down similarly to how one does a female
omega. He nuzzled his face against the crook of Prompto's neck and licked at
his scent glands. They were pink against his freckled skin and swollen which
made it easier to kiss and suck at. Right away did Prompto relax in his arms,
breathing out a thankful sigh. His body was absolutely pliant under him and
with that realization came the thought that Gladio could do more. His reasoning
was clouded with alpha assertions, convincing him that more would make the
omega feel good. More would make the omega feel ecstasy. Gladio wanted to give
Prompto that.
It was at this point that Gladio felt something dampen his pants. It didn't
take long to figure out that Prompto's slick has soiled through his underwear
and school slacks. Gladio gritted his teeth. It was never like this during
training. He remembered everything to be far more subdued, even when he was
told that it was supposed to prepare guards for the real deal.
Prompto angled his neck, desperate for more contact. His whole body hummed with
electricity once he felt suction on his scent glands. Unknowingly, Prompto was
spreading his legs apart and his hand was squeezing at Gladio's hand, leading
it between his legs so he could feel just how needy he was.
Gladio let him do as he wanted, thinking that right now Prompto is too far gone
anyway. He ignored the chaos inside his head, reproaching him that it takes two
to tango and he's just as far gone as the omega in heat. He relaxed his hand
and let the omega squeeze and cup at his crotch over Gladio's hand. He could
feel the wetness there, the slick heating up the skin more. He cursed to
himself. He could feel Prompto's slick soiling through his own pants and making
a sticky mess on his lap.
"You have to tell me where you're from so I can help you better." Gladio said
in a comforting tone. But for all his effort, he was still met with a
frightened whimper. 
"Why?" Prompto shook. The hand over Gladio's halted their lewd direction. "I
grew up in Insomnia. I promise I'm not lying!" 
Gladio let out a sigh and lifted Prompto off his lap. He set him back down on
the bed, or tried to, at least. Prompto wrapped his arms around Gladio's neck
and his legs around Gladio's waist to keep himself firmly connected to the
alpha. He was murmuring against his skin to stay with him and never leave.
"I'm not going to leave. I'm just gonna make you lie down on the bed."
"But I want you to be pressed against me. My body hurts, alpha."
Gladio suspected as such. Prompto's skin was burning hot and the slick coming
out of him wasn't stopping. He can only guess just how sensitive his body is
right now. He pitied the poor boy. Just seeing his first male omega made him
think that maybe, being one had too many complications. 
"Prompto, let go." Gladio commanded as he eased the omega's grip loose. He
didn't come away without a whimper and a surge of discontented scents. When he
was back down on the bed, kneeling and directing a pained look right towards
Gladio's eyes, the alpha felt like he could choke.
Prompto held a hazy eye contact as he undid his belt, unbuttoned his slacks and
tugged them halfway down his thighs. His wet underwear followed, coming down
with a lewd squelching noise.
It was funny to be surprised about it but because Gladio was so used to omega
pheromones being exclusively for women, he couldn't quite believe that Prompto
did have a penis. His surprise came out more as a throaty groan when he saw
Prompto direct that needy look towards him. That azure gaze could beg and beg
and Gladio would absolutely yield. 
But there was still the matter of drawing the line between being a helpful
alpha and taking advantage of an omega in heat. Gladio managed to anchor that
thought at the forefront of his mind. All the while, Prompto pulled at his
desires, digging his pretty fingers in and drawing them out one at a time.
Prompto bent down to press his cheek against Gladio's thigh, face purposefully
close to his hardening cock. He looked up at him from below with big blue eyes
that wanted to suggest so many things that Gladio just can't do if he wants to
keep calling himself an upstanding member of the Crownsguard and an alpha of
self-restraint.
Gladio swore he could hear him coaxing him to fuck him and knot him and keep
going until they're both blissed out completely. 
"Listen." Gladio's hoarse voice caused the blonde to falter a bit but he was
still there, adamant on rubbing his cheek against his crotch. Gladio willed
himself not to look down and instead focused on ways of comforting the omega
without having to shed any clothes himself. 
"Please?" Prompto interrupted his thoughts and cupped Gladio's cock through his
pants. "I need it really badly..." He begged and then pressed his face to
Gladio's abdomen, murmuring, "I'll be so good... I'll let you have everything
you want." Prompto pulled himself away after that, only to shift to all-fours
and turn so his backside was presented towards Gladio. One delicate hand
reached behind him to pull at a cheek, gifting the alpha a view of his
entrance, pink and glistening from slick, soft-looking and absolutely inviting.
Gladio's hands fell to seize Prompto's hips, his grasp wide enough that his
thumbs could easily keep him opened up. Instantly did he feel his mouth
watering. Everything alpha inside him just screamed 'fuck him already' but
Gladio won't. He'll touch him... but all in the name of comforting him. 
His thumb prodded at his puckered hole, causing it to twitch upon contact. It
was crazy how wet the boy was. Gladio glanced at Prompto's thighs and found
that his slick had run all the way down to his knees and pooled to a damp spot
on the bed. 
"I really need it... I really... please, oh please... lemme have it." 
Despite his head being foggy, he remained in control. Gladio picked up the
discarded green toy on the bed and pressed the tip against Prompto's hole. 
"Ah..! Oh, please..." Prompto raised his hips to meet the toy but Gladio pulled
back and instead drew the toy up and down his crack, trying to coat it in as
much slick as he could. 
"I know you're all ready to go... but I'm not gonna take any chances. I don't
want you hurt." Gladio explained. It was easy for him to imagine that it would
hurt there no matter how horny Prompto is. He didn't expect the omega to go
back to whimpering and sobbing when he did so. 
His body went limp on the bed, his hips the only part raised up since Gladio
held him there. The toy tickled him in the most sensitive of places, the little
rubber spikes making him flinch and shudder. 
"Sshh... don't cry. I'm here." Gladio soothed Prompto through scent and voice.
However, he didn't stop dragging the toy's length against his hole, twisting it
every now and then to make sure it has a nice, thick coat of slick. 
When he deemed it ready, he leaned down to check on the omega. He found Prompto
biting down on his bottom lip and eyes squeezed shut. "What's the matter? Are
you holding back?"
Prompto shook his head as much as he can while pressed on the bed. "I just... I
feel really close already... I'm embarrassed..."
"It's fine. Don't worry. Do you want me to put it in now?"
"Yes!" 
===============================================================================
Gladio spent the night at Prompto's. He was wary at first since he expected
Prompto's parents to come home at one point and demand answers as to what he's
done to their son. But the sun set and rose and no one came. He took note of
Prompto's living situation and wondered if he truly is being taken care of.
It's one thing for parents to be uneducated about a male omega's sexual health.
Heck, he didn't really know what to do with him either. But it's another thing
to leave a kid alone overnight. He didn't even lock the door behind him when he
retreated in his house in a frenzy. Gladio couldn't imagine what would have
happened if he wasn't there and another alpha indulged themselves.
Didn't you indulge yourself too?  The thought kept knocking around in Gladio's
mind and he had to shake his head to will it away. He looked down at the
sleeping omega who's finally calm after a long night of just... coming. Gladio
detached himself from Prompto on the bed and stood up to make breakfast. He
didn't have to do this but his body felt like it's on auto-pilot.
Keeping yourself busy won't make what you did any less shameful. The thought
forced itself in his mind and boggled his conscience. 
 
Chapter End Notes
     I'm sorry this took so long. TT_TT
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
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