Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/6313168.
  Rating:
      Explicit
  Archive Warning:
      No_Archive_Warnings_Apply, Underage
  Category:
      Multi
  Fandom:
      IDOLiSH7_(Video_Game)
  Relationship:
      Izumi_Iori/Nanase_Riku, Yaotome_Gaku/Kujou_Tenn, Yaotome_Gaku/Kujou_Tenn/
      Nanase_Riku/Izumi_Iori
  Character:
      Nanase_Riku, Izumi_Iori_(IDOLiSH7), Yaotome_Gaku, Kujou_Tenn
  Additional Tags:
      Sibling_Incest, Blow_Jobs, Anal_Sex, Roughness
  Stats:
      Published: 2016-03-21 Words: 4297
****** Rectangle ******
by Kaurudim
Summary
     How do you dress up a summary of a messy foursome?
     The answer is "you don't."
Notes
     HOLY MOTHER OF PEARL IT'S BEEN 48 HOURS AND HERE I AM WITH MORE P O R
     N this has many of my guilty pleasure STUFF peppered throughout, have
     fun.
     The title is mostly from an in-joke; we just called this whole idea
     the "rectangle orgy." It is really very self-indulgent.
Surrounded by other buildings just like it, the grey building didn’t really
stand out to anyone who wasn’t looking for it. It wasn’t as tall as the high-
end department store down the street, nor was it as luxurious looking as the
hotel at the corner. But the small sign just above eye-level, with its gold
embossed English lettering and gothic style, revealed the wealth of those who
called this apartment home.
Iori and Riku walked through the revolving doors to find marvel floors and
golden siding. Neither had worked particularly hard to disguise themselves,
having been told by Ten to simply come in casual wear.
“It’s surprising how much less suspicious it’ll be,” he had smirked the last
time they met. “After all, what’s wrong with visiting a friend?”
Riku continued to walk forward aimlessly, mouth agape and eyes sparkling as
much as the elevators were.   The messenger bag on his shoulder gently bumped
at his hip at every step he took, as if urging him even further into the
building. But before he could get much further, Iori grabbed at his wrist and
swiftly brought him to the front desk.
An older woman, peaking over wire frame glasses, stared them down.
“I’ve never seen you boys around here.” Her voice had a deep gravel that didn’t
quite suit her age or pointed appearance. She stared very pointedly at the bags
both boys were carrying.
“We’re here to see…a friend.”Iori offered.
“Well I’d sure hope so. And which friend is that?”
So much for getting away without saying anything.
“Well, that is—“
The elevator rang behind them, the sound reverberating through the empty
reception hall. All three turned to the sound. Riku’s sigh of relief didn’t
quite match with the strong grip he had on Iori’s forearm, but Iori wasn’t sure
he could altogether blame him.
“It’s alright, ma’am. They came to see me.” Gaku walked out of the elevator
with a sure step and a winning smile, aimed entirely on the receptionist after
sparing a wink at Iori.
“Well, goodness boys, if you had come to see Gaku-kun you should have said so!”
The threatening air in her voice was replaced entirely by lilting, almost
girlish tones. “Go on, head on up with him! Let me know if you need anything.”
Gaku bowed in thanks at the woman, and gestured towards the elevator. Riku
followed with a start, whispering “Yaotome Gaku…” under his breath; Iori also
turned to bow to the receptionist and entered the elevator just before the
doors closed.
“This is quite the building.” If Riku wasn’t going to attempt conversation, he
may as well try.
“Ah, yeah. I told my old man I wanted a place to stay for work so I wouldn’t
get in my family’s way, and he got me this place.” Gaku’s laughs had a slight
edge of bitterness to them. “Though if he knew what actually happened here he’d
probably kill me.”
“I-is Ten-nii…?”
“Upstairs.” His face softened into a warm smile as he looked at Riku’s
shivering frame and his near death grip on Iori’s arm. “Hey…Nanase, if this
isn’t your thing, you can say so.”
Whether it was what he said or how he said it Gaku didn’t know, but Riku was
finally able to look at Gaku directly in the eyes.
“No, it’s fine. I…” He blushed, but didn’t look away.
“Haha, alright then.”
The elevator door opened with a single quit ping, and they stepped into a wide
and ornately decorated hallway. Gaku led the way to the very end, and quickly
and quietly opened the door to reveal the entryway to his apartment. It was
well-furnished, with a couch and loveseat in muted greys and a black coffee
table with a clear top being the first things they could spot.
“A corner room…” Iori murmured as he entered, seemingly satisfied.
“And mostly soundproofed.”
“Ten-nii!” Riku unceremoniously dropped his bag at the edge of the coffee table
and bounded towards the small hallway Ten had appeared from. “Did you…?”
Ten nodded with a grin, so Riku started bouncing in one spot. They both turned
their attention to Iori and Gaku, who had remained in the entryway, with a
similar wicked glow in their eyes.
“Riku, grab your bag. Gaku, I’m going to take Riku into the spare room for now.
Take…Iori…into the back room.”
Hearing his name come so simply from Ten startled him. He locked eyes with him
for the briefest of moments until he broke it with an almost indistinguishable
wink. Riku returned to the coffee table to pick up his bag and, with a wink in
Iori’s direction, disappeared with Ten down the hall and through a door.
Distantly, they could hear a lock.
“They are more similar than I’d like to admit,” he mumbled, very valiantly but
very poorly hiding a blush.
“Oy, Izumi. Does Ten usually call you by name like that?”
“No. It’s the first time I’ve heard it.”
Gaku nodded. He double checked the locks on the door and deftly moved behind
Iori. He grabbed his shoulders and slowly, carefully, steered Iori towards the
very back of the hall.
“We’ve got some things to do,” He crooned directly into Iori’s ear. Iori’s legs
grew weaker than he ever anticipated they would, so he relied on Gaku pushing
him forward to keep him moving.
The back room was similarly furnished to the rest of the apartment, but the red
covers over the dim lights and the off-pink of the soundproofing material
combined to give the area a warmth that the apartment otherwise lacked. The
covers on the large—King sized?—bed, as well as the pillows and cushions on the
chaise longue at the far end, also appeared to be remarkably soft.
“Ten picked those out,” Gaku remarked, moving the door shut but not closing it
completely. Then, he added with a sly grin, “They’re liquid-resistant.”
Iori, who had entered the room and walked slowly towards the chaise longue,
abruptly dropped his bag at the edge. He turned around, blush even stronger
than before, to face Gaku.
“Y-you mentioned we had things to do.”
“Ha, I always wondered who was more forward between you two…guess it’s Nanase.”
Gaku walked past Iori to the bedside table and brought up a box that had been
hiding in shadows beside it. He quietly handed it to Iori.
At his raised eyebrows, Gaku’s only reply was to nod at the box.
So Iori opened the box. And he came very, very close to dropping the box.
Inside, on top of what Iori definitely recognized as his own school cardigan,
was a small pleated skirt and an even smaller note.
I thought it’d suit you! –Riku
“Something this cute could not possibly suit me.”
“Oh, so it’d suit Nanase instead?”
“Better Nanase-san or Kujou-san than me.”
“And better you than me.” Gaku turned back around to grab another box, similar
in size to the one Iori now placed gently on the bed. “I don’t know how the
hell he did it, but the brat also managed to grab one in my size.”
He briefly flashed the contents of the box in Iori’s direction. Just as he has
said, there was another cardigan and a skirt of similar design. Iori could just
make out the note, different only from his own in that he could see where Gaku
had gripped at it.
I wanted to show everyone how cute you could be. Go on, wear it for me. –Ten
“This could never suit me,” he continued, all but throwing the box on the bed.
He lowered his voice, and brought his mouth right next to Iori’s ear. “But you,
on the other hand…”
Gaku’s hands landed softly on Iori’s hips. His breath hitched at the contact,
but he didn’t pull away. His thumbs traced skin right under his shirt and Iori
instinctively stepped closer at the touch. At Gaku’s moan of approval, still
next to Iori’s ear, Iori too let out a small sound.
“Try it on, before they get back.” Gaku’s hands moved to the front, and his
fingertips danced on Iori’s stomach before finally undoing the buttons on his
pants.
Iori’s left hand followed Gaku’s arm up to his shoulder, and then rested right
under his ear. He pushed Gaku back just enough so that he could look at his
face. His other hand reached out slowly for Gaku’s stomach, and his fingertips
pulled slightly at his pants.
“I will, if you will? It’s only fair, after all,” he managed, and smirked
slightly at the surprise blossoming on Gaku’s features.
Gaku laughed and pulled back completely, but their fingers each ghosted across
the other’s quickly growing bulge. The slight contact only served to stimulate
them even more.
“So you have your moments too,” Gaku observed as he picked up his own box. He
gestured with it towards Iori’s own box, and both began to change.
They wordlessly turned away from each other, like some kind of unspoken promise
to spare each other embarrassment until they were both fully prepared to face
it. But the rustling of clothing against skin and the quiet thump of each
separate article being dropped on the floor only heightened the excitement.
Finally, finally, after what seemed like an eternity but was in reality not
even three minutes, they both turned around.
Iori’s box had been furnished with a pair of thigh-high socks that he was all-
too-willing to ignore, but he put them on while thinking very hard about Riku’s
reaction. It and the cardigan, which hung on him loosely without his blazer,
emphasized his small frame.
What Iori wasn’t prepared for was Gaku in similar attire, however. He towered
over him, but his own black thigh-high socks, held up with a garter, made his
legs look incredibly long. Iori’s eyes traveled up and down the length of his
legs multiple times, trying to quash any urge he had to be subjected to them.
But as he traveled up one more time, it finally and properly dawned on him that
there was one thing neither of them had been furnished with.
“I guess you’re enjoying the show. Maybe the brat was right after all.” Gaku
smirked as he walked towards Iori. He placed one hand on his hip and another on
his thigh. He slowly brought the hand on his thigh up and rested right at the
edge of Iori’s near-completely erect dick, before moving back around under the
skirt to rest right on his hip.
Iori also reached out, very tentatively, and ghosted his fingers across Gaku’s
shaft from above his skirt. The small sigh Gaku let out was almost—almost—as
good as any sound Riku had ever made for him. “And I could say the same for
you.”
Gaku laughed through his nose and gracefully dropped to his knees. “Why don’t
we get you warmed up.”
It was all the warning Iori was given before Gaku’s mouth was all he could
think about.
Gaku’s head almost disappeared under the skirt, but Iori was too preoccupied
with the sounds of Gaku’s hands clawing at his backside and of his mouth and
tongue taking in all of Iori to really care. Gaku relinquished Iori’s shaft for
only a moment to guide Iori into sitting on the chaise longue before diving in
again.
The situation felt too uneven to Iori, however, so he slowly moved his foot and
pushed forward and up with a gentle force in the hopes he had hit the right
spot.
Gaku’s moan around Iori’s dick and the slight pushback he felt told him he was
right. He wriggled his toes and rocked his foot at the ankle, and Gaku
gleefully thrusted forward into the sensation. Iori braced himself with his
hands while he experimented with the force and angle, eventually falling into a
rhythm that elicited moans and grunts with every single push.
“Yaotome-san…louder…”
Gaku responded eagerly, more than Iori ever hoped. He threw his head back and
squeezed his eyes shut, ready to lose himself in the sounds.
The door opened, and from there an amused voice called out. “I hope you don’t
mind an audience.”
Gaku removed himself from Iori, licking his lips and sparing a glance at Iori’s
flushed face with a triumphant grin. Iori was no less triumphant, however, and
managed a quiet smirk through the haze. They both looked towards the door, and
if they weren’t fully erect before then they were now.
Ten and Riku appeared carrying towels, a basket of various items, and a bowl of
water, which they placed on a small table at the front of the room. They were
both completely naked except for a matching underwear and garterbelt set. There
was a small fan of cloth that came out from the garter attached at the hips and
back, billowing out behind them as they walked around the bedroom.
After finishing what he needed to do, Riku’s eyes locked on the scene in front
of him. Gaku was still on his knees in front of the chaise longue, and Iori’s
foot was still on Gaku’s bulge. Iori himself was still sprawled out, legs apart
and dick fully erect.
“Iori.”
At that name alone, Iori’s dick visibly twitched. Riku licked his lips and made
to step forward, but Ten’s hand snaking around his waist stopped him.
“Be patient,” he whispered, and brought a hand to the elastic of Riku’s
underwear.
“Ten-nii, I don’t wanna be pati—aah….” Riku rocked his head forward to rest on
Ten’s shoulder.
“I know”, Ten crooned softly into Riku’s ear, using his other hand to brush at
his hair. “But you’ll have to deal with me for now. Is that okay?”
Riku nodded slowly, uncertain, and let Ten guide him to the bed. Ten crawled on
it first, backwards, and pulled Riku toward him. He then spared a glance
towards the chaise longue. Gaku stood, and Iori soon followed. Gaku held out a
hand to stop Iori from moving any further, but he hadn’t any intention of going
in the first place. He just wanted to get closer, and watch.
“Riku and I are twins,” Ten began, leaning into the crook of Riku’s neck and
finally pulling down the band on the underwear. His eyes were focused on Gaku
and Iori on the other side of the bed. Riku sighed at the freedom, and leaned
his head to brush against Ten’s. “So maybe our interests actually align.”
Ten’s hand gently stroked Riku’s shaft once, twice, before twisting at it
roughly while pulling. Riku screamed, his voice warbling with pleasure as he
thrust into Ten’s hand. Ten’s eyes shone with glee as he watched Gaku and
Iori’s mouths slowly open, and their fingers twitch.
“Ten-nii…again, Ten-nii…!” Riku moaned through his panting. Ten obliged, slowly
stroking his hand down and then pulling it up again, twisting in the opposite
direction. Riku’s head lowered to find Ten, and Ten’s gaze on Iori and Gaku was
finally broken as he was drawn into a kiss.
Iori watched with wide eyes and a quickly beating heart as Riku’s tongue
entered Ten’s mouth and they drew closer. He watched as Riku’s hand clawed down
Ten’s torso and underneath the light material of the underwear to roughly grab
his shaft and pull, just like Ten had done to him. And Iori’s hands quietly
began stroking his own dick as Ten broke away from the kiss in a heated moan.
He let out a very quiet “Riku…” as he worked himself harder and harder.
Ten pulled Riku on top of him and grabbed both of their dicks with his hand. He
slowly began pulling and stroking at them in time with Riku’s moans. Ten’s
voice joined Riku’s, and soon they were singing together as they gyrated
against each other.
Iori felt a hand at the small of his back push him onto the bed, then another
come around and start stroking him. He reached up and back to put a hand on
Gaku’s neck and pull him closer as he adjusted to kneeling on his knees.
“Yaotome-san…you don’t need to prepare…” Iori whispered out between moans. “J-
just...”
Gaku nodded into Iori’s shoulder and brought a hand to his own dick, wet with
precum, and tried to make it as slick as possible. He then brought his hand
underneath Iori’s skirt and circled the rim before entering one single finger.
He pumped his finger inside Iori, whose moans and called out obscenities added
to the cacophony of the room.
And then, Iori felt Gaku’s dick enter inside of him, and he wailed. Even the
slight dryness and the pain, something Iori was usually careful to avoid, only
amplified the pleasure he had already been feeling. The scream stopped Riku and
Ten’s movements and they looked over as Gaku began to thrust powerfully inside
Iori, who had brought both of his hands up and behind to hold on to Gaku.
Riku’s eyes traveled down to Iori’s dick, bouncing from under the skirt with
every thrust Gaku made, and he began to thrust in time against Ten. Ten moaned
at the sudden movement, and stopped Riku.
“Hey. Stand up, like Gaku is.”
Riku pouted at the request, but went along anyway. Ten crawled to the edge of
the bed and kneeled in front of Riku while fully lowering his underwear.
“Look at him,” he commanded, eyes traveling back to Iori, “and fuck me.”
Riku’s eyes grew wide with amazement and concern. “Ten-nii, is that really…?”
Ten nodded once, slowly. Riku stepped as close to the bed as he could and
grabbed Ten’s hips. One hand slid to the front to grab Ten’s shaft and begin
stroking, and the other pulled Ten back onto his own dick.
Ten cried out Riku’s name while Riku simply moaned. Gaku stopped thrusting to
watch Ten get acclimated, and then made eye contact with Riku. They both slowly
began thrusting again, trying to time their movements with each other. And as
soon as they had figured out their timing, their eyes shifted slightly
downward—Riku to Iori, and Gaku to Ten.
Riku watched Iori’s flushed face, the way his eyes shut so tight so he could
focus on the sounds, the way his mouth hung open and his tongue rolled with
every moan he let out. He watched the way his dick moved up and down with each
thrust, and the timing almost made it seem like he was the one to make Iori
move that way.
And Gaku watched Ten’s flitting eyelids and the way his eyes would roll back if
something was hit just right, and followed the trail of red on his cheeks to
his ears. He heard the small “ah” he let out with each thrust, and the timing
almost made it seem like he was the one to make Ten sound like that.
“I’d like to get off like this,” Gaku moaned load enough for all to hear, “But
I think we can go a bit longer, don’t ya think?”
Ten laughed in response, but it was all he could do before he was silenced with
another thrust.
“W-we practiced…” Riku moaned out from Ten’s shoulder.
Iori could only nod, and hoped a small squeeze from his hand in Gaku’s hair was
enough to convince him.
So they kept going, harder and harder and harder until all four of them let out
a moan or scream. They all seized up momentarily, but when they were sure they
were safe they rolled into the last of the strange sensations.
Riku and Gaku pulled out. Ten and Iori fell forward, barely supporting
themselves with their hands and elbows.. Everyone was panting, reeling in the
orgasm, but not a single one had ejaculated.
“Good…” Ten moaned, motioning towards the towels. Gaku gestured at Riku to sit
on the bed as he fetched a slightly damp towel for everyone. They all quietly,
breathlessly, washed themselves down wherever they needed to, and set the
towels aside.
Iori took off his cardigan, but didn’t bother with the skirt. Gaku followed
suit, sighing in relief as the air hit his sweat-soaked skin.
They all sat on top of the soft bed sheets catching their breath and watching
the others quietly, taking in details they may have missed before.
“So Nanase. I heard,” Gaku began with a grin, “That you have a good mouth.”
Riku jumped at the comment, and looked around at everyone. “Well, that’s what
Iori says”—cue blush from Iori—“and I told that to Ten-nii onc—ahh, Ten-nii,
you talk to him about that stuff!?”
Ten simply shrugged with a self-satisfied smile. “I thought I should.”
Riku pursed his lips, but then after a moment added, “Well, Iori’s mouth is
pretty good too.”
They made eye contact. Riku’s face was scarlet, but his eyes were steeled and
shining with something…so Iori laughed, finally understanding his intention. He
crawled towards Ten as Riku crawled towards Gaku. They both smiled at their new
partner, and simultaneously took in their length.
Iori’s hand came underneath to fondle Ten’s balls, and Ten squirmed at the
touch. He doubled over Iori, clawing at his back and trying to find enough
leverage to thrust into the warmth. Iori didn’t try to stop him, instead happy
to let Ten pummel into him as deep as he could. He called out Iori’s name in
tones so similar to Riku’s, but somehow loftier, and soon his other free hand
started pumping at his shaft in time with Ten’s thrusts.
Riku’s tongue moved in swirls on the underside of Gaku’s shaft as his head
bobbed up and down, and Gaku hissed at the sensation. His fingers twisted
through Riku’s hair, and after Riku brought a hand up to push his own head
down, Gaku started forcing Riku’s head down on him faster and faster. His legs
spread out and he leaned back, stuttering out “Nanase--!” between labored
breaths and moans. Riku, too, was moaning each time his head was forced down,
and he wriggled against the bed sheets in desperation.
And for each of them, they stopped just before they hit the climax. Gaku and
Ten looked at each other—Gaku for permission, Ten for confirmation—and they
forcefully turned Riku and Iori around to lay on their sides. Riku could see
Iori’s dick in front of him, twitching each time he so much as breathed in it;
and Iori could see Riku’s, dripping in precum and staining the sheets below.
Gaku picked up one of Riku’s legs, and Ten one of Iori’s. The leaned over their
partner, and asked.
Riku nodded, pleading with Gaku.
Iori moaned, asking Ten to hurry.
Ten and Gaku looked at each other one more time, and leaned in for a kiss.
Gaku’s tongue licked at Ten’s mouth, which opened freely. And the deeper their
kiss went, they deeper their dicks entered Riku and Iori.
And when they were in completely, they wasted no time in moving.
Riku watched Iori’s dick moving in tandem with the thrusts and licked his lips.
He leaned forward just enough to bite at the skirt, and through his moans moved
it out of the way. He was just able to get his mouth around the tip, tongue
darting out to taste more of Iori and moving in circles in time with Gaku’s
thrusts.. Iori yelled out Riku’s name at the contact, torn between thrusting
closer to his mouth, and thrusting in time with Ten.
So Ten moved Iori closer, and Gaku shifted Riku as well. Iori’s hand reached
out to find Riku’s, and their fingers entwined. Iori closed the distance
between his mouth and Riku’s dick just as Riku did the same, and even if it was
rough or messy or even painful at times, all it did was push them closer and
closer to the edge.
Gaku ghosted kisses down Riku’s leg through the stocking, and used a free hand
to steady Riku’s torso. He thrusted even harder, faster, deeper into Riku,
eliciting moans from around Iori’s dick. Moans of Gaku’s name, of Iori’s name,
of Ten’s name.
And Ten rolled his hips with every thrust into Iori, hitting him just right
with every single movement. Iori moaned and whimpered around Riku’s dick,
barely able to call anyone’s name at all.
Iori and Riku finally came first, ejaculating into each other’s mouths and onto
their faces, in high moans and screams. Their muscles tensed up around Ten and
Gaku, who leaned into each other for one final open-mouth kissed as they rolled
into the spasms and came messily into their partner.
Gaku slowly pulled out of Riku, and Ten out of Iori. A trail of semen followed,
urged out as their muscles continued to spasm. Gaku and Ten left them on the
bed, panting and clutching at each other, to grab towels and cool water.
As Gaku gentled patted a damp towel on Riku’s face and worked his way down, he
leaned in against Riku’s forehead. Riku could see his furrowed brows very
clearly from so close. “You okay?”
Riku nodded slowly, quietly, with a smile. “That was…really fun…”
Iori let out a hoarse laugh, and Ten just looked on in surprise before shaking
his head.
“Do you think you can move?” Ten helped Iori sit up as he winced in discomfort.
“Riku and I set up a bath earlier. You two can go first.”
“Kujou-san, you also—“
But Ten shook his head with a smirk. “Oh no, don’t worry about me. Gaku quite
likes it rough, so I’ll be fine soon. And…”
Ten’s eyes traveled down to the ejaculate on the bed sheets.
“You need it way more than we do.”
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