Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/8337478.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Shingeki_no_Kyojin_|_Attack_on_Titan
  Relationship:
      Levi/Eren_Yeager
  Character:
      Eren_Yeager, Levi_(Shingeki_no_Kyojin)
  Additional Tags:
      Incest, heat_-_Freeform, they're_brothers, I_is_trash._Sorry, Eren_is
      like_11_or_12, and_Levi_is_23, Mildly_Dubious_Consent, Knotting, riren_-
      Freeform, Alpha_Levi_(Shingeki_no_Kyojin), Omega_Eren_Yeager, Alpha/Beta/
      Omega_Dynamics, Alternate_Universe_-_Modern_Setting, Pedophilia, Underage
      Sex, Anal_Sex, Shota_Eren_Yeager
  Series:
      Part 1 of By_blood_and_love
  Stats:
      Published: 2016-10-25 Words: 3090
****** Thicker with blood ******
by lawismyname
Summary
     Having to return home from work, Levi did not expect to witness his
     little brother's first heat.
Notes
     So, yay I'm straying from my other fics, I hope you forgive me.
     I have written this a long time ago but left it for my other fics,
     and finding it again in my drafts I decided to finish it. Tada!! Also
     I modified some facts about heat cycles, just for the sake of Eren
     not getting pregers at a very young age. Hehe XD
     Please be guided by the tags, this story contains pedophilia and
     incest, so if you don't like it please read another story.
See the end of the work for more notes
Eren scrambled through the bathroom door as he head immediately to the medicine
cabinet over the sink. His short hands flailed hopelessly to the handle,
letting out an angry shrill when it was too high for him to reach out.
The young child curled into himself, arms pressing to his tummy as another wave
of pain clawed his lithe body. His breathing had changed drastically over a
short span of time as he panted for air. It was hard to breathe when his heart
was pounding forcefully against his ribs, expelling the so needed oxygen out of
his lungs. His little legs trembled, knees bending closer to the floor as his
strength was slowly being drained. It was wet. There was something slick and
warm dripping to his thighs.
He was merely playing outside the backyard of their home, when suddenly an
overwhelming heat washed over his skin, and a painful ache settled in his
tummy. He ran into the house and straight to the bathroom in hopes that there
might be some of that syrup that his brother used to give him when he was sick.
Tears born from pain and frustration flooded down plump cheeks and they
reddened due to his body temperature that was beginning to elevate almost akin
to a fever. He sunk to the floor, knees finally giving up on carrying his
weight. An unfamiliar scent invaded his nose. It was like candy, sweet and also
tangy like oranges. Confusion blurred his rational thinking. There was a primal
need rising from inside of him as he searched for relief for this agonizing
heat that was consuming his body.
He needed something, he needed to do... do what?
Breathing in pants, he laid himself to the bathroom floor, sighing in comfort
when the cold tiles somehow eased the heat streaming though his blood as it
seeped into his skin. His voice croaked, calling in an inaudible whisper his
big brother's name.
 
===============================================================================
===============================================================================
 
 
"Eren, I'm home!" Levi announced, his smooth baritone voice ringing loudly and
clearly into the house. He hung his coat away, placing his shoes on the nearby
rack. A frown marred his apathetic features at the lack of response from his
little brother. Every time he comes home from work, Eren would always greet him
back, running with enthusiasm across the room and clothes most likely to be
drenched in sweat. A brilliant smile would be plastered on his pretty lips as
he give Levi his daily dose of hugs and mouthful kisses, which in truth the
older man anticipated and dearly loved.
Eren had always been sweet and thoughtful, always asking his days and tried his
very best in cleaning. Not to mention, he was the only person who seemed to
tolerate his blunt and rude attitude. Most children would be whining and crying
their eyes out when ordered to do household chores but Eren enjoyed his tasks
with him, mentioning once that he loved cleaning since those were the times
they share and bond together and Levi's poor heart clenched at the innocently
sincere confession.
His lovely and beautiful Eren. The little brunet would haunt his thoughts
relentlessly. The images that rolled into his mind were nonetheless the
opposite of platonic. He was in the wrong but heaven knew he tried so hard to
stop his feelings from turning into something romantic. But living in the same
house and interacting with Eren with all the days that passed, Levi's thriving
defenses broke down.
He wanted to be with him always. To be the one to protect him and shower him
love and security that an alpha should posses. He truly hoped that Eren would
be an omega when he finally present his status. Despite his raucous nature and
exuberance, Eren had essentially frail body and effeminate features. Not to
mention the eagerness he possessed whenever he was obeying Levi's orders were
qualities of an omega and such behavior only encouraged his wishes.
He should be at home an hour ago. Levi noted as he ambled around the rooms
upstairs, looking for the brunet, but as he looked over the youngster's room,
it was empty.
Dread and anxiety crept up with his chest, heart gaining pace as he searched
for his brother. Worry painted his expression, and called Eren's name but once
again, he received no reply. He went downstairs, hurriedly heading to the
bathroom, seeing the door to be open. The scent that permeated the air was
heavy and he exhaled sharply, almost as if he was punched in the stomach.
He stood there, stunned as a jolt of electricity streamed through his nerves,
sending a catalytic reaction to his primal instincts and elevating the
sensitivity of his senses. It was sweet like cinnamon and there's also a hint
of orange. It was absolutely heavenly, inducing his mind to a carnal daze. He
only came to a realization that it was his younger brother that was on the
floor, sobbing as his little frame shook from the intensity of his heat.
He was too young, barely a teen and hasn't even reached the peak of his pre-
adolescence age and yet he was lovely, scintillating than anything else in the
world. Never had he felt such compulsion to breed, to claim and mate. He should
leave, but how can he put this beautiful imagery to waste.
Intense green eyes turned to him, glistening with tears that only seem to
amplify their jewel like luster. The reddish cheeks were enticing and the
quivering lips evocative with sounds that Levi never thought Eren was capable
of.
"Big brother it hurts." Eren whimpered weakly, form shaking with just the small
effort of talking.
Levi's body moved automatically, responding to the beckoning call of the omega
and slipped an arm under the knees and rounded his the other over Eren's
shoulder as he pressed him closer to his chest.
With such close proximity, he was engulfed with the arousing effusion of Eren's
pheromones, and almost comically, he let out another sharp breath. His lips
pressed light kisses on top of the chocolate mop of hair and in turn he earned
himself a needy whine from the omega. A growl rumbled through his chest, his
alpha clawing through his control upon hearing the plea of the omega, he
wanted- no he needed to claim Eren, but not here. He wanted Eren on his bed, to
make his omega comfortable and well taken care of.
Gathering his will and thoughts together, he forced himself to move and carry
the brunet to his room. Every step was painful and every second was filled with
thoughts and impulses that would deem the omega as his.
Indeed, he wanted Eren as his. Now that he had finally presented his status
Levi was all the more glad with the results. Though it was uncommon, union
within family members were not looked down by their society, having so little
numbers of omega population, an alpha can claim an omega of his blood to be his
mated and also to keep the bloodline pure. His father did the same with their
mother, who was his first cousin.
Alpha and omega: the perfect pair. And as he thought of it, indeed Eren and he
fit together accordingly. He would claim Eren, taint his being with his seed
and knot him. But somehow Levi was letdown with the fact that he couldn't breed
Eren with his pups. Not yet. Since first heat cycles acts as a catalyst for
development, inducing the omega to undergo bodily changes, especially with
their reproductive function. That's why their hormones elevate dramatically and
induce pheromones with its purpose to initiate bonding for a compatible mate.
Besides that, Eren's womb was not yet ready to carry a child. Either way, Levi
doesn't allow that to disappoint himself. In the future, if Eren would be ready
to have children with him, he would happily make that come to a reality.
He carefully placed the omega on his bed, easing the grip on his clothes as the
tiny fingers clung to him tightly. Eren squirmed on his sheets, rubbing his
scent and sniffing the sheets that were tainted with the alpha's scent.
A surge of heat flowed southwards as he watched the brunet inhale the faint
amount of scent left on the sheets, unknowingly giving Levi an eyeful of his
bottom as he wiggled and ground his hips against the bed to achieve some
pressure on his hard arousal.
Levi loomed over Eren, hands steady on both sides of the brunet's head, knees
positioned beside the sprawled legs of his younger brother.
"Eren." He called, voice dark and low with desire as he leaned down and nuzzled
on the soft locks of hair to drown himself to that addicting scent. The omega
let out a mewl, turning to him upon receiving attention from the alpha.
"Le-Levi," was the weak call of his name and he brought his grey eyes to stare
down at viridian orbs gleaming with expectation. Not wanting to disappoint, he
closed the distance in between them, kissing the rosy lips with slow and
languid movement of lips. He swiped his tongue along the bottom and was granted
the permission to taste the warm cavern of that tantalizing mouth that
continued to moan and whimper with each thrust of his appendage.
Short but slender hands slid up his neck and he was pulled closer to the
writhing figure of his brother. Eren, clumsy with his inexperience, tried to
keep up with him, but nevertheless the enthusiasm made up for the lack of
skill.
Balancing himself on one hand, he burrowed his arm under Eren's back, and with
a clean swift movement he pulled Eren up to his lap so the brunet can straddle
him. He seated himself on the mattress, eliciting a surprised yelp that soon
faded to a moan as the omega admired his strength.
He moved away from their kiss, ignoring the disappointed whine as he bowed his
head and licked the glimmering drop sweat on the indentation of the brunet's
jugular. A sharp tug rang through his head, and he pulled his lips back and dug
his teeth over the curve of the tan shoulder. A burst of iron and salt invaded
his sense of taste and a high pitched cry left Eren's lips. Levi purred in
apology, licking the wound that signified his mark over the omega.
He disrobed Eren out of his clothes in a frantic haste, the compulsion of
wanting to see everything of his omega fueling his actions as the dark blue
shirt and brown shorts were thrown to the floor. Once stark naked, he stared
hungrily at the exposed body with pale hands ravenously marking every inch of
skin with his scent all the while embedding the depths and curves, the texture
and shape to memory. 
His thumbs stopped over the upper torso and he began rubbed the perking rose
buds. A mewl echoed in his ears, and Eren jolted as he pinched and rolled them
under the pads of his thumbs.
"Big-ahh-b-brother! M-more!" His omega pleaded piteously and Levi indulged his
mate's wishes and swallowed a bud into his mouth, tongue teasing and teeth
grazing the nipple. Eren moaned loudly, his frame quivering in pleasure and he
arched his back, pushing his chest against that warm mouth for more. 
Levi chuckled darkly, amused and delighted to have Eren turn to a shivering
mess under his ministrations. He wanted to please the other, make him forget
about the world and make Eren only think of him, his touch and kisses, his
love. Levi needed to make Eren his as he had always been Eren's.
Switching to the next nipple, his hands lowered to the curve of Eren's bottom.
He squeezed the two cheeks tightly, kneading the soft round buttocks, the tips
of his fingers brushing over the wetness of the crease.
A growl vibrated in his throat, his nails digging into the flesh as he declared
the words 'mine'over and over again.  It was his, all of Eren, and he will
embark these marks on his flesh to show everyone that he belonged to him. That
he was mated to Levi.
He spread them apart, his forefinger nudging the wet puckered hole of his
little brother. He felt the muscle twitch against his finger and not a second
later, he dipped it inside the hot cavern, groaning at the tightness and
wetness as his own cock jerked against his pants. He rubbed the walls gently,
slowly to cause no discomfort to the omega. His finger were slicked up with the
copious amount of lube that drenched his omega's hole. He searched the hot
walls for Eren's prostate, moving his finger tentatively. Once he was able to
find it, he deliberately stimulated the bundle of nerves, making Eren jolt and
scream as his little cock spurted its cum. 
Levi couldn't help but find him breathtaking. His messy chocolate locks clung
to his temples as they were soaked with sweat. The bow-shaped lips were agape
as he panted for air, and those brilliant eyes were now clouded with lust and
want, its ends brimming with glittering tears that threatened to spill over.
"Fuck, you're so beautiful baby boy, so wonderful." Levi crooned against his
ear, inhaling a plentiful of that saccharine smell. He added another finger in,
wiggling it carefully as he littered kisses and sucked on the flesh to decorate
it with red splotches and teeth marks. Feeling a tug on his clothes, he glanced
at Eren, barely missing the faint murmur passing through his lips.
"Big brother I want to see you too. Please take them off." Eren blushed, he was
expecting that his brother would do as he was asked, but Levi did nothing. Not
hearing a reply, he whined and the man instead offered him a suggestion. 
"What if you take them off doll? I still have my fingers in your tight little
hole to prim you for my cock. I don't want you to get hurt as I enter you
inside. Can you do it for me?" Deciding that Levi had a point, Eren nodded
weakly and unbuttoned the crumpled white shirt clumsily, breath hitching as he
pushed his palms against the hard muscles of his brother's torso.
Levi smiled proudly upon hearing the satisfied moan that left Eren's mouth. The
small hands clawed his chest, marking them with nails and overlaying them with
scent. Levi's heart swelled and his cock throbbed prominently when his omega
praised his body, his hand pressing on his groin.
"Big, so hard too. Big brother's cock is huge." Eren appraised, petting the
organ through the layers of cloth. Levi immersed himself at his brother's
touches while his hand continued automatically in preparing Eren.
Hands shaking in excitement undid his belt and unzipped his pants. Levi growled
lowly as a hand reached down and pulled out his hard cock out of its
restraints. Eren stroked it slowly with both hands. The tip of his length was
already dripping with precum with just the simplest touches and he wondered if
he could last long enough to be buried inside the tantalizing cavern of his
omega's hole.
After the addition of his fourth finger, he deemed him ready and kissed Eren on
the lips. He guided the omega down on his length, the tip rubbing against the
wet hole and Levi groaned as he breached the first inches in, swallowing Eren's
whines and cries with a ravishing mouth. Placing Eren's hands over his
shoulders, he lowered him until the coarse hair of his groin tickled the
sensitive cheeks.
He let Eren adjust for his size as he peppered butterfly kisses on the omega's
neck, whispering sweet nothings and praises about how good he was, of how well
he took his cock, that he was so tight and so warm and wet and so perfect.
Feeling Eren shift his hips with impatience, he took it as a signal to move and
started a steady pace, carefully observing for any signs of pain of discomfort.
Seeing none, he allowed his speed to increase gradually, pulling Eren in time
with his thrusts.
It was remarkable how Eren stretched around him yet he was tight and sucking
him so greedily like he belonged inside that intoxicating cavern. As if Eren's
hole was made for him. Indeed those thoughts made him elated, drunk in a haze
as he pistoled his hips faster.
Drawing the omega up until the head of his cock, he slammed Eren down to his
lap, hitting that bundle of nerves with a strong force. The omega screamed and
Levi continued his onslaught, drilling himself deeper and harder that his balls
smacked loudly against that lovely ass, his knot swelling at the base and
Eren's eyes were rolling up in their sockets. He drove himself repeatedly until
Eren stilled with a broken cry of his name and he drove himself as deep as he
can, releasing his seed violently, tainting the walls white with Eren's name on
his lips. The omega clenched tighter around his cock, milking him all of his
cum as his knot locked them together as one.
Heaving handfuls of air, he embraced his younger brother fiercely. Levi felt
Eren nuzzling on his neck before placing a kiss on his lower jaw. The alpha
huffed in amusement, finding his omega absolutely adorable. A wet stripe laved
his left shoulder, and Levi, realizing what Eren was intending to do, tilted
his head to provide him a wide access to his neck. The omega sniffed and kissed
the patch of skin before he opened his warm mouth and bit into the skin.
Electricity coursed over his form, his heart beating erratically with the
current. The mark was now established, the bond weaved between the two was
stronger, thicker with the blood they share.
"Big brother is mine now, right?" Eren asked, eyes glowing with a spark of
determination and admiration. Levi gave him a genuine smile and kissed his
brother passionately, drawing a faint purr from the other.
"Yes, and you are mine." He declared with finality. Eren grinned widely,
squealing in delight and triumph and attacked Levi with kisses.
"I love you big brother". He confessed, grinding his hips as a familiar heat
was starting to engulf his body once again. Levi took notice of it and laid
Eren on the bed, gyrating his hips as he whispered his affections to his omega.
"I love you too Eren. Always."
 
 
 
 
 
 
End Notes
     I know I'm lame at writing but I really enjoy it as my hobby.
     I hope I didn't disappoint you perverts.
     Also I'm thinking of writing some power bottom, omega Eren fics..
     What do you guys think??
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their work!