Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/581190.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      The_Avengers_-_Ambiguous_Fandom, The_Avengers_(2012), Thor_-_All_Media
      Types
  Relationship:
      Loki_(Marvel)/Thor_(Marvel)
  Character:
      Loki_(Marvel), Thor_(Marvel)
  Additional Tags:
      Underage_Sex, Masturbation, Mutual_Masturbation, Sex_Toys, Intersex!Loki,
      Sexual_Experimentation, Incest, Squirting, Oral_Sex, intercourse, Smut,
      And_Lots_of_It, Porn_Without_Plot, Alternate_Universe_-_Modern_Setting,
      Alternate_Universe_-_High_School
  Stats:
      Published: 2012-12-03 Words: 2269
****** Love, Lust, Temptation and Sin ******
by wicked_writings
Summary
     What else is a big brother for, than to lend a hand when necessary??
Notes
     Oh dear god. What is this. Not exactly the best thing I've ever
     written, but that's probably not the point here... Dirtiest thing I
     written, YES. I'm off to have a shower and scrub myself down with
     disinfectant.
It was freezing out, chilling Thor to his very bones as he trudged through the
snow on his way home from school. His coat was soaked through and he'd lost his
hat between the 3rd and 4th period, and his gloves were nearly worn through. He
thought about digging a snow cave and crawling in it to die.
He made it home without catching frostbite, although it was a close call.
Inside it was warm, the heaters on full blast. He shed his coat and soaked
trousers and was in the shower in less than a minute. The hot water drove the
chill out of skin and soothed his muscles, and he stayed under the stream for
longer than he should have.
The house seemed empty; his parents were still at work and would be for a while
yet, though Loki was home somewhere, having pulled a sickie earlier that
morning. Thor had been angry at him then, and then angry at himself later that
day, when he was soaking wet and freezing. Loki had always been the clever one.
Thor dressed quickly, and thought about getting dinner on. He knocked on Loki's
door to ask what he wanted, but the room was empty. Thor hoped to god Loki
hadn't left the house, because that would mean he would have to track him down
before their parents got home, and he did not want to go back outside to freeze
his balls off again.
Thor growled. He stomped around the rest of the rooms, but Loki was nowhere to
be seen. He was steeling himself in preparation for tackling the weather again
when he heard a noise from the basement. It was either Loki or a burglar, and
as neither took surprise very kindly Thor made his way quietly and carefully
down the stairs.
Many years ago, his father had knocked up a few walls in the massive basement
space, but had never gotten around to finishing it. The end result was a bunch
of random rooms, some of them missing doors. The first was the largest, and a
rec room of sorts, complete with pool table and broken jukebox. Thor made his
way through the others – the second, a spare bedroom, the third, a storage
space for things that no-one wanted to throw out.
He pushed open the door to the fourth room quietly, and stepped through. Loki
was here alright, but Thor wasn't quite prepared for what he found.
Loki was naked, his black hair flat with damp, body shining with sweat. He lay
on a couch, towel underneath him, hands working furiously between his legs.
Thor had been so quiet he hadn't managed to disturb him.
Rather than being a sight that should have sent Thor back upstairs in a hurry,
he found himself stuck to the spot. And when Loki opened his eyes and saw him
standing there, not even the utter horror that passed over his brother's face
could make him move.
Loki sat up suddenly, face flushed, and scrambled for a blanket to pull over
himself. He was like a startled deer, and Thor felt the sudden need to reassure
him.
“I... Loki, it's ok. I'm sorry, I should have knocked.”
“'Should have?'” Loki squealed, and still Thor couldn't make himself move.
“Why are you down here?” he asked, although he wasn't sure why he needed to
know.
“So no-one would see me, you idiot!” Loki said, and Thor could see a thin film
of tears covering his eyes.
“Oh Loki...”
Thor closed the door behind him and moved to sit on the couch behind Loki,
pulling him up into a hug.
“Thor... what are you doing?” Loki asked against his collarbone.
“I'm sorry!”
“You could have just turned around and left!” Loki pointed out when Thor let
him go.
Yes. He should have, Thor thought to himself; quite frankly, it was a bit rude
to stay when his brother clearly needed a bit of 'alone time'. He could leave
now, and Loki could get back to... whatever he was doing.
He didn't. He sat there, Loki still leaning against his chest, and something
stirred inside him, further down than he thought possible. Loki was warm and
close, his black hair tickling his chin, skin pale and sticky. He realised,
with a start, that he didn't want to let go.
“You want to keep going?” he asked, though it wasn't in jest.
“Yes,” Loki whispered, after a moment.
Thor swallowed as the image of what he saw when he walked in the room flashed
in his mind's eye. He paused for a moment, then leaped.
“Can I stay?” he asked quietly, heart pounding in his ears.
Loki jerked in his arms, and Thor, in reflex, gripped tighter.
“Why?” Loki asked, almost breathless with confusion.
“Because I want to see,” Thor said honestly. They'd grown up with Loki being
different, though when they were very little Loki wasn't different at all, he
was just Loki. It wasn't until school and changing rooms and boys' lines and
girls' lines that he became aware just how different Loki was. There had always
been curiousity on his part; the usual curiousity of a young child, then
curiosity as to why Loki had to “become” a boy, then curiosity in his teenage
years as to how everything “worked”.
Loki was quiet. Thor took that was a good thing; at least he hadn't been
horrified and kicked him out of the room straight away.
“Just watch,” Thor whispered in his ear, and he saw Loki screw his eyes shut.
“Ok,” Loki murmured. “Just watch”.
It felt like something inside of him gave way. Thor smiled, and kissed Loki's
hair, before standing up and letting Loki lay back down again. He watched as
Loki spread his legs, and let his eyes drift down between his legs. Thor felt
all the air leave his body.
Loki was hairless; though whether he shaved or that was just how he was, Thor
wasn't sure. His cock, a little smaller than Thor's own, was hard and leaking
against his stomach, the head white with precum. Loki had no balls, like Thor
did – he once overheard an adult talking about “internal testicles” or
something like that – instead there was a small, smooth expanse of skin and
then Loki opened, his slit wet and glistening, lips spread. Thor could see his
clit, hard and swollen, and his hole, open and damp.
As he watched, Loki slid a hand down between his legs and circled his clit with
a finger, teeth biting down hard on his lips. His other snaked down to press
two fingers into his hole, and Thor felt his jeans become almost unbearably
tight. Loki worked his fingers in and out as he moaned, back arching off the
couch. He added another finger as he pressed against his clit, cock jerking as
he fucked himself, whining with every thrust.
“Shit,” Thor said, and palmed the bulge in his jeans.
He couldn't tear himself away though, and as he watched Loki's movements became
erratic, his legs trembling. Curses tumbled from Loki's lips as his hips began
to snap upwards, fingers buried as deep as they could.
“Oh fuck oh fuck oh fuckfuckfuckfuck....” Then Loki's moans trailed off and his
hips bucked and he was shuddering all over, but all Thor could see was the
bursts of clear liquid that spurted out from around Loki's fingers over and
over as Loki whined through his orgasm. The towel was soaked beneath him, his
thighs shining with slick.
“Oh god,” Thor said, and thought he was going to faint.
Loki had practically collapsed back against the sofa, chest heaving, eyes
closed. His body was still trembling though, and every now and again another,
small, rush of liquid would trickle out from his slit.
Thor let him be for a little while, and feeling like he was going to damage
something if he didn't ease the pressure in his jeans, unzipped himself and
pulled out his erection. He palmed himself gently as he looked at Loki, legs
still obscenely spread. It was so wrong, it was so fucking wrong, but Thor
couldn't stop himself if he tried.
Loki sat back up after a few minutes and watched Thor with dark eyes under
lowered eyelashes. It was as if he knew exactly what he did to his brother,
body displayed as he was.
Thor spat in his palm and fisted himself, trying his hardest to make it last,
but Loki... Just to make it harder for him, Loki began to finger himself again,
just gently, making little dribbles of wetness slide out from him.
“God... Loki...” Thor groaned, and his little brother just smirked.
Thor didn't know where he got it from, but suddenly, there in Loki's other
hand, was a flesh-colored dildo. As if he was in a dream, he watched as Loki
slid it into himself, moaning as he did. He pressed the dildo in with one hand
and gripped his erection with the other, and set a slow but thorough pace. Thor
watched, trancelike, as the thick dildo breached him over and over again,
Loki's pink lips opening up to take it in so easily.
It was more than Thor could take and he spilled over his hand, cum staining his
t-shirt. He shuddered though his orgasm, imagining Loki's wet heat around him,
gripping him. Loki watched him, tongue running over his lips, and Thor wanted
so badly to be closer.
“Jesus, Loki,” he panted, his entire body thrumming with desire and the after-
effects of his orgasm.
Loki smiled, and then he was beckoning Thor closer, and nothing, not the threat
of parents or the law or social norms could stop Thor shedding his shirt and
jeans and moving to stand between his brother's legs.
He ran his hands up the inside of Loki's silky thighs and felt him shudder
beneath him. He leant forward and kissed him softly, tasting sweat and
something heady and dark, and it was delicious. They both watched as he eased
the dildo out of Loki, throwing it onto the sofa. He lowered himself to kneel,
and almost without thinking bent forward to lick his way up Loki's slit.
One hand gripped Loki's erection, and the other played with Loki's hole,
pushing into a little ways with a finger but never fully. It was wet,
unbelievably wet, and Loki tasted of sweet and tart both at once. He sucked at
Loki's clit, gratified by the sudden cry and tightening of Loki's legs and hole
around him.
“Oh god Thor Thor Thor... don't stop... oh fuck!” Loki keened, and Thor felt
his cock heavy and hard again between his legs.
He slid two fingers into Loki's hole and pushed deep, raising a moan, and he
thrust them in and out, feeling the soft, slick wall around them.
“Wait...” Loki whispered, and Thor sat up, stilling his movements. Surely Loki
didn't want to stop now? His brother gripped his hand, and shifted his fingers
until they were curved. “Keep them like that, face them upwards,” Loki said,
panting, and laid back against the couch.
Thor did as he was told and felt a difference in the shape of the walls, but he
didn't have time to think on it because Loki was suddenly crying out, his body
trembling again. Then he felt it, warm, slippery fluid gushing over his hand,
and he looked down to see it running over his skin. He kept going, didn't stop,
and then Loki was over the edge, body tight and spasming around his fingers.
He watched Loki cum, never ceasing his movements, and felt the liquid squirt
over his hand.
Loki didn't collapse after his orgasm this time, just reached down to pull
Thor's fingers out and tug him up to standing. Thor kissed him harshly and then
Loki's hand was on his hard cock, guiding him to his hole, and Thor tilted his
hips just so and watched as he slid inside his brother.
It was tight, despite both he and Loki's attentions, and it was wet, and so
soft. He was different from the others, Loki, not as fleshy as Jane or Tasha
had been, and he seemed to be more in tune with his body, knowing just how he
needed to be touched. Thor rocked into him, driving deep and hard, and Loki's
hands slid up around his shoulders to pull him closer.
They kissed, and fucked, and as Loki moaned into his mouth Thor reached down to
grip his erection. He fisted him in time to his thrusts, and Loki lost it
beneath him, screaming out his pleasure as Thor drove into him over and over
again.
Thor could stay there forever, feeling like that, but he knew he couldn't last
and then he was coming, pouring himself into Loki, who was shuddering and
mewling underneath him and then there was a sticky wetness on his stomach.
They collapsed on the couch, Thor still deep inside Loki, their arms around
each other. Loki buried his head into Thor's chest, panting for breath. All
Thor could do was stroke his hair and press kisses to his forehead, and think,
we shouldn't fall asleep right before they both did just that, wrapped up in
each other.
*
Thor started to take an awful lot of sick days after that. If anyone looked
closely at the school records, they would be able to see they corresponded
almost exactly with the sick days taken by his younger brother.
Sick days, Thor thought, were the best days of them all.
*
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