Okay so, first sin chapter I've actually published n' I wanna quickly say something.
I'm sorry, but please don't joke in the comments. I know it's all in good fun and your intentions aren't bad, but I have anxiety and it goes through the roof when people joke about the sin chapters on other people's books.
I'm not gonna be able to deal with it here, and I'm probably gonna delete your comment.
I can deal with them on normal chapters because I'm joking on normal chapters, but I put a lot of work into these ones to publish, as dumb as that sounds. I guess it's a lot more nerve wracking to post these.
But, I digress. I hope you guys.. Enjoy? Yeah! Also, sorry I haven't proofread this yet. It's already been a month. It's been finished long before that.

-

"Man! I'm so happy, I'm not gonna be able to sleep. I can't sleep normally, but this isn't gonna let me get a wink!"
Tamaki unbuttoned his blazer and took it off, laying next to Mirio and cuddling up to him. "I-I don't think I'll be able to sleep either."
Mirio turned to him, smiling. He giggled some, shifting and pulling Tamaki a little closer. "You're so handsome." he commented, his small smile getting a little bigger and he kissed his new husband gently.
Tamaki kissed him back, and he wasn't sure why he flinched a bit when Mirio nipped at his lip gently.
He gladly opened up, shivering slightly as he felt a tongue that wasn't his own.
It was always like the first time they'd done this with Tamaki, and it was a little funny.
He seemed so nervous but so into it at the same time.
He pulled away after a solid twenty seconds, carefully rubbing the strand of saliva from their mouths, then wiping that on the sheets so he could caress Tamaki's cheek. He liked that. Mirio smiled gently, "D-do you, um.. Want to..?"
Tamaki swallowed thickly, nodding a little and averting eye contact.

•❅─✧❅✦❅✧─❅•

Mirio smiled a little and moved his thumb, so Tamaki could take it into his mouth.
He really didn't have a problem with the fetish, it made things more intimate and he was aiming for that.
He sat up the rest of the way, "Y'sure?" he clarified, just to be extra careful.
"Y-yeah." Tamaki followed him up, holding his wrist gently.
Mirio nodded slightly, shifting them so his husband was against the bedframe. He leaned in, and Tamaki lent forward, expecting a kiss. He was a little surprised when his neck was the target, but he didn't object, leaning his head away to allow more space.
They weren't a stranger to this, at most. Tamaki'd never let him see anything below the belt out of embarrassment and possible shame even if they had gone further than French kisses before. Kinda weird, but Mirio respected him.
Of course, it didn't seem like they'd done it before. It seemed like he hadn't ever done this, he was so sensitive. He'd probably never get used to it. Not that Mirio was complaining; he loved the little squeaks and moans he gave. He was so cute.
Mirio loved a lot about these moments, especially the gasps and shivers he got when he trailed his big hands down the indigoette's little waist, then down to his hips and slowly unzipped his dress pants.
"Is this okay?" he asked softly, always careful not to be taking it too far. He didn't want to hurt Tamaki or make him uncomfortable in anyway.
Tamaki nodded hesitantly, sitting up and rubbing saliva from his mouth and Mirio pulled his hand back. He tensed up, looking away as his pants were peeled off. It was... Really weird to know he had an erection, and that Mirio was looking right at it.
He caught his eyes, and nodded slightly at the unspoken question. Yet, he found himself snapping his legs closed right as his boxors were pulled off.
Mirio backed up a bit, then crawled up and kissed Tamaki on the nose. "I don't have to look." he spoke softly."Or do it at all.
"N-no.. I-I- I just... I-I'm embarassed..." Tamaki swallowed, sinking his head into his shoulders. He looked away, swallowing thickly. "Y-you can.."
Mirio didn't look down automatically, humming a bit and thinking for a second.
He would have moved behind Tamaki and pulled him to his chest, but he knew that Tamaki was not okay with that position at all. He had an idea why, but wasn't going to ask or press.
He backed up once more, making am effort not to stare at him. Mirio definetly wanted to, though, he'd never had a good look at his body and he really wanted one. He wasn't going to make him uncomfortable, though.
Mirio did look down at his erection for a moment, though, and felt his face heat up. And not only because Tamaki's was probably bigger than his own set of equipment.
He laid in between Tamaki's legs, planting a small kiss on his cock, then wrapping his lips around and finding a smile growing as the indigoette jerked his hips up and let out a whine of pleasure.
Mirio was going to say something, but he decided in humming in response instead, the subtle but stimulating vibrations it caused driving Tamaki insane.
"M-Mirio..!" Tamaki breathed, leaning backwards slightly. He still wasn't gonna look down
That made Mirio want to go further than just simple sucking and tongue movements, and he took more into his mouth, licking up and around the shaft.
Tamaki was never really a moaner. More squeaks and whines, but when he got real into it, he got loud.
That's what Mirio was aiming for. He absolutely loved it when he got loud. Some because he loved it when Tamaki was vocal, but also because that was when his mind was almost shorted out because he was feeling so good. That meant no, or at least much less, anxiety.

A good amount of why he was so vocal right now was because they were very alone. It was late and they didn't have neighbors anywhere close enough to hear. Tamaki could be as loud as he wanted and no-one would hear.
The other part was all the pleasure.
The sounds were also bringing him close to climax, and when he opened his eyes, he couldn't have imagined what it looked like.
But the way Mirio was looking up at him through his lashes, his half lidded eyes and- jesus, there's not much he could do to make it better. One of which was something he could do.
"M-Miri- ahhn.. Mirio... W-wanna.." he gasped, finding his orgasm nearing closer. "s-see.. I-I wanna.. See...

Ah, that's what he wanted. Of course! Mirio smiled gently, pulling his head up just enough to be able to fit his hands there too. He felt Tamaki twitch a few times inside of his mouth, and he hummed again, just to keep the pleasure consistent.
"Oh- oh my god..!" Tamaki squirmed and reached down, ringing his hands through Mirio's gelled hair, biting his lip.
"N-no-no- Mirio- I-I'm..!"
That was a habit of his; when he was close, to climax, he'd always not want it to end, and he would voice that. Usually just in 'no's. It scared the hell out of Mirio the first few times he did it, but he knew he couldn't help it.
Mirio popped off with a satisfying sound, running his thumb over the heaps of precum, using it as a sort of lube. He started pumping, licking up his slit.
Using his other hand to keep Tamaki's hips on the bed, he could definetly tell he was about to cum. Realizing that the smaller was trying to gently pull his head away, but Mirio only obliged for a moment. Just to speak. "Shh, calm down. Just let it out," he coed, licking up the shaft one more time. "In my mouth." he wrapped his lips back around the tip.
Tamaki felt a little bit over stimulated, and he found his legs lifting in the air out of his control. He wrapped them around Mirio's torso, squeezing and thrusting subtly into his mouth.
"Fuh-fuck-! Mi-mirio! AhhHh, nnh!!" he lent forward, finding it very hard to stay still. "I-I'm- I'm almost there- I-I'm almost there, I-" he let out an odd sound that sounded like a gag, but he definetly wasn't. "I-I..! I'm- coming- coming!"
He pushed Mirio's head down, letting out a loud and emphatic curse as he tensed up, coming a full load into his mouth. That was fuckin amazing. He hadn't done this in forever, if there was any way to get him into the swing of this again, this was it.
Tamaki flopped backward onto the bed, gasping for breath, as he found it hard to remember that he needed air to live.
He was pretty busy basking in the intense afterglow, and only realized that it was so intense because Mirio was stroking him slowly when he stopped. Tamaki looked down at him, and suddenly realized that he probably couldn't swallow it all. He sat up, "Ah, wait- you don't have to..!"
Mirio had already swallowed. While it wasn't the absolute best taste in the world, it definitely wasn't the worst. He rubbed the bit that dribbled from his lip, "You know I don't mind." he spoke, smiling gently, and giggling a little, planting a few kisses on Tamaki's face.
"Was that too much?" He asked softly, realizing that might have been just a bit much. They hadn't had time to do this in forever and he knew how Tamaki hated masturbating. Maybe they should have started with something easier.
"I shoulda held back."
Tamaki shook his head, "N-no.. I-I loved it, y-you're perfect, you're amazing..." he reassured, even quieter than Mirio.
Said blond nodded slightly, only hesitating for a few moments before asking. "Um, d-do you wanna... Really.. Do it?" Mirio asked, adding a small, shy laugh to the end. He was kind of nervous to ask. They'd tried once and they didn't end up going through with it, because Tamaki accidentally got hurt and they were both too nervous and kind of scared to continue after that.
"Um-uh... Y-yeah.. If-if you're okay with it.." Tamaki nodded slightly, trying and swallowing his nervousness.
Mirio felt his heart skip a beat. "A-alright, uh, there's some stuff we gotta do to make sure nothing gets messy and we're all safe n stuff..."
"You looked it up?"
He paused for a second, then laughed and shifted sheepishly. "I was planning ahead! I didn't wanna hurt you, so I did some research!" he sounded almost like he was defending himself.
Cute.
"Alright, I-I trust you."

-

Tamaki's refractory period lasted pretty much as long as they needed, which was good timing.
"Alright, I'm not gonna mess this up this time." Mirio reached over and grabbed a pillow, placing it under his husband's ass to aid in their height difference.
They had to start slow, though. He couldn't just shove it in, that's the opposite of what he wanted to do.
The blond ran his index finger across Tanaki's rim, who flinched and tensed up, but relaxed rather quickly. Thank goodness. "O-Okay.. So, I'm just gonna use my fingers first, then the real thing."
They sounded like teenagers.
Mostly just because Mirio was uncharacteristically nervous about this. He didn't want to do anything to hurt him or do anything that he didn't like.
Mirio quickly grabbed the bottle of lube, flipped the cap up, and lathered a generous amount onto his fingers. Of course, there weren't any websites for The Gays in this department, but that didn't mean he couldn't find anything that would work for them anywhere else. You couldn't have too much anally until you used more than the bottle.
Even though that same website had said silicone based lube was the best for anal, he kind of panicked and got the water based.
Now would probably be the best time to add this in, right? He didn't know, he was really just guessing.

Tamaki nodded a bit, but again tensed as he felt two fingers. It didn't hurt that bad, just a buzzing in the background if anything, but it just felt really.. Weird. Foreign.
Just because he didn't like to masterbate didn't mean he didn't. He'd done his fair share of experimenting, and this just so happened to be a part of it.
"Does that hurt?"
"No.. Just kinda weird.."
Mirio nodded, then tried moving his fingers a bit, to see if that actually caused pain. Luckily, he didnt seem to be. The small squeaks indicated that.
Mirio felt himself relax, able to get into a kind of rhythm.
Right when the indigoette was about to (attempt to) ask him to add another, that's exactly what he did. In messing up that rhythm, Mirio accidentally brushed up against that spot, and it got a good moan out of Tamaki, his hips shooting into the air.
"Does that hurt?" Mirio asked quickly, even though he didn't think it did, he still had to ask.
"N-no- please-" The smaller took a quick breath. "Pl-please hit that again.."
He nodded slightly, smiling and trying to get the rhythm up and running again with that spot in mind.
He didn't manage to, but brushed it every few times.
Yet, getting through the first few minutes became teasing, it wasn't enough anymore. Mostly because Tamaki knew what was to come, and now he was getting antsy. "M-Mirio.." he whined, getting embarassed suddenly. "I-I'm... I'm ready..."
Out of everything that was happening, that's what got Mirio to blush profusely. "Uh, okay. Alright." he nodded, smiling and pulling his fingers out.
That felt even more weird.... Empty.
"Just lemmie..." he reached over and grabbed a condom from the box, and put it on.
And he actually pinched the top like they say you have to.
He positioned himself, taking a breath and glancing up at his husband's face, and he suddenly wanted a picture.
He looked so perfect.
"I'm gonna actually.. Put it in now. Okay?"
"A-alright..."
Mirio took a deep breath and pressed the tip to his entrance, sucking in a breath before shoving some inside. He quickly raised his hand to his mouth to stop the groan of absolute pleasure. That's amazing.
He almost thrust in further, but had to make a conscious effort not to, since Tamaki-
He quickly looked up, almost as if he'd completely forgot about him. Upon seeing his face contorted the way it was, Mirio almost wanted to pull out. "Hey- I can stop if it hurts!"
"A-all.." Tamaki took a few deep breaths, reaching out his hand and grabbing Mirio's. "All... The way in. I-I gotta get used to it like that."
"But-" He cut himself off, nodding a little. Different people liked to get used to it in a different way. "Alright, just.. Please tell me to stop if you don't like something."
"I will, I promise."
Mirio looked down at himself, then thrust his hips forward, his heart clenching at the pained sound Tamaki couldn't help but make. He quickly lent forward and peppered his face and neck with kisses, trying to help and distract him from that pain.
He didn't expect it to take a few seconds, but definetly wasn't expecting over five minutes. It was okay, though, he could wait. He could wait for this.

"O-okay... You.. Can move now.." Tamaki murmured, after rolling his hips to make sure it was really okay.
"Y'sure?"
"Yeah."
Mirio nodded, slowly pulling out, then thrusting his hips forward again. He let out a gasp mixed with a moan; it felt so good.
"Gh-god, you're so tight.. Mmnh, that feels so good.. You're perfect, Tamaki, perfect-!" He gasped out, continuing on the useless, lewd banter.
Tamaki bit his lip, squirming slightly and wrapping his arms around Mirio.
He took in a sharp breath each time Mirio's hips hit his own, and was already letting out soft moans.
"Mirio..." he breathed, biting his tongue gently. The slow pace wasn't gonna last, and he was preparing himself for it. He just didn't expect it to come so fast.
Mirio, of course, gave him a warning but he was already sped up, and Tamaki felt himself digging his nails into his back.
It wasn't untill Mirio shifted himself a little (because his leg was gonna cramp if he kept it in that position) that Tamaki got louder, his back arching into him.
The blond' almost completely forgotten that he'd actually found that sweet spot.
Man, if Mirio's brain hadn't halready shorted out because of the pleasure, the look on Tamaki's face was enough. It was enough on it's own. He probably should have started out slower, but he couldn't go back now, and he really wasn't thinking about going back.

"Rh-right there--" Tamaki let out a longer moan, whining out Mirio's name a couple times. "F-fast- faster-"
He tightened up his grip, lifting his legs a bit again. He couldn't help it. He just wanted to be closer to him, even though that was real hard at this point.
It was kinda hard to explain; like it was only him and Mirio. He'd blocked out anything else, even the bed squeaking. Like he couldn't think of anything else if he tried, it didn't exist. Nothing else could have been on his mind if he wanted it to.
Mirio felt the same way, by 'definition', at least.

Tamaki would've been at least a little surprised that he was gonna be able to cum without any extra touching.
When he did it himself, he needed both.
Maybe just because it was Mirio.
...
Definerly just because it was Mirio.
"M-Mi-Mirio- I-I'm..! I'm gonna!" he grit his teeth and tried to hold it in, but with the sounds that this was making and the ongoing bliss only had upward spikes, it wasn't gonna be for long.
"Just a little longer, Sawa~chan, just- ghn! A little bit longer!"

Tamaki tried his best to hold it in, but he really couldn't last more than a few seconds, flinging his head back and letting out a long, loud, and emphatic moan as orgasm slammed into him full force.
And Mirio thought it'd take him another few short moments, but he was proven wrong. The way Tamaki clenched up sent him over the edge.
He didn't bother to pull out - that was like 80% of the reason he'd wore a condom. The other 20% just being his anxiety.

They both stayed frozen in that position for a while once Tamaki flopped onto the pillow again, panting for breath.
Mirio got his breath back first, and knew he had to pull out at some point.
He pulled off the condom, since it was pretty uncomfortable already, and tossed it into a trash bin after tying it.
Yes, he knew that didn't actually work. He was just getting it out of the way. He'd toss it properly in a bit.
"I'll be.. Right back." He hated to leave, but he wanted to grab a towel and a few blankets.

Tamaki smiled gently as he watched Mirio jog back into the room, quickly cleaning him up, planting a few kisses on his face.
Then, he climbed up next to him, setting up some blankets.
Tamaki curled up and got nice n close to Mirio, cuddling and snuggling till he fell asleep in the comfortable silence.
Then they cuddled n snuggled all night.