Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/ works/5486027. Rating: Explicit Archive Warning: Underage Category: M/M Fandom: アイ_チュウ_|_Ai_Chuu_(Video_Game) Relationship: Kururugi_Mutsuki/Li_Chaoyang Character: Kururugi_Mutsuki, Li_Chaoyang_(Aichuu) Additional Tags: NSFW, Blow_Jobs, Oral_Sex, Eye_Contact, Fluff, Established_Relationship, Face-Fucking Stats: Published: 2015-12-21 Words: 4422 ****** Crept Up In You ****** by Hitsugi_Zirkus Summary Chaoyang would love to be able to look Mutsuki in the eye during their most intimate moments; all he needs is a little push. Notes So I've only recently gotten into aichuu THANKS TO A CERTAIN KOHAI, and even more recently got infected with aggressively shipping Mutsuki and Chaoyang and... It was just all downhill from there. Basically this scenario was running through my head all during my linguistics final and I knew if I didn't hurry up and write it, it'd just plague me for the rest of my life. Mutsuki is so subdued and Chaoyang is just so skittish, I have no idea why the first thing I decided to do was write them in a smutty situation, but here we are. If you read this, I hope you enjoy! See the end of the work for more notes When it came to other people, Chaoyang became a very meticulous person. He was more conscious of his and others’ actions than usual. There were times, of course, when social interaction was inevitable and there was no room for running away, so Chaoyang had to do his best to walk carefully around the eggshells he felt like he would be surrounded by. He tried to tell himself that being around other people more would be good for him in the long run anyway and work him toward being less shy. These days, opportunities to prove himself came along pretty often since he came to the idol academy. Interesting people far more outgoing than he bumped into him frequently and put him on the spot. He usually had no choice but to try and hold conversation normally, albeit hiding his face more and more into his scarf and darting his gaze anywhere but the other person’s eyes. Such nervous habits had become especially relevant once he started seeing someone, had become the boyfriend of someone, of Mutsuki Kururugi. Interestingly enough though - and to Chaoyang’s relief - despite being the twin of Satsuki Kururugi, Mutsuki was practically the opposite in disposition. He was carefree just like his brother yes, but his aura was overall much more subdued, his daily ongoings quiet. In other words, he was approachable for Chaoyang. His simplicity and predictability, while still being completely sociable and open-minded, were big plus factors for Chaoyang when it came to forging a friendship (and eventual romantic relationship) with Mutsuki. That was why Chaoyang was presently trying not to freak out. “Hey... I’m getting sleepy. We should stop here for the night.” Two sentences. Two simple short sentences were effectively making Chaoyang’s composure crack way too fast. It was just that he had been so careful. After being in a relationship with Mutsuki for the past few months, Chaoyang had picked up the rhythm of Mutsuki’s lifestyle - namely, his sleeping schedule, which was vastly different from his with Mutsuki getting twice as much sleep (and then some) than he did. To be clear though, Chaoyang never minded Mutsuki’s weary state in the slightest. He was, in fact, always prepared for it - having Mutsuki’s favorite tea and soaps on hand in case he slept over, and keeping his fluffiest blankets clean and ready. Mutsuki’s sleeping face was so sweet and peaceful, his enjoyment for resting clear on his relieved expression as he’d been fighting sleep all day. So it wasn’t Mutsuki’s sleeping habits themselves that were the problem here. They were safe, sweet, and predictable. But Mutsuki saying he was sleepy now, with Chaoyang under him and both of their faces lightly flushed and their lips wet from saliva. So suffice to say the statement was unexpected. It was still only barely nearing eight, a full hour or so before Mutsuki began his sleeping ritual. They were supposed to have...time for being together. And while Chaoyang thought it way too embarrassing to admit, he knew deep down that he’d been hoping that tonight would be one of his and Mutsuki’s more intimate nights. That was why, for once, Chaoyang had been the one to initiate the cuddling and then the kiss that Mutsuki had successfully been swept up by, pressing Chaoyang down onto the mattress with one hand rubbing his hip and the other slowly undoing his braid. Chaoyang got caught in the moment. He thought they had time to. But now, Mutsuki was claiming he was sleepy and that they should stop, and well, there was really no way he could argue that. It was out of the question. Aroused or not, Chaoyang had to put a lid on his panic from this sudden change of plans and nod, quickly darting his eyes away from Mutsuki, who was pointedly not looking at Chaoyang’s eyes and instead the pillow next to him. “Oh, ah… Okay. L-let me get out everything then. Um, did you want tea or a bath tonight?" “Too sleepy for a bath. Maybe tea though?” “I’ll start it.” Chaoyang rose up, pulling down his shirt that had rode up from Mutsuki’s ministrations. He quickly started on making his braid neat again as well - the last thing he needed was his fellow band members teasing him on his mussed appearance. It was embarrassing enough what thoughts must be running through their heads when they knew his boyfriend was spending the night, so confirming them was out of the question. Calm down, calm down. I should really make myself some tea too to compose myself. “Chaoyang, you forgot to straighten out something.” “H-huh? What?” He turned to Mutsuki, frantically patting over his hair and clothes. A soft laugh escaped Mutsuki’s lips. “Maybe ‘straighten out’ is the wrong word. ‘Un-straighten’ might be better.” Still at a loss, Chaoyang chanced to look at Mutsuki just to see where his gaze was pointing at. Oh. Letting out a mortified squeak, Chaoyang put his hands in front of the rather noticable bulge in his pants. “I’m sorry! I-I-I’ll take care of it in the bathroom!” Oh no oh no, embarrassing, so so soooo embarrassing! His face felt hot enough to make tears start welling in his eyes. “Ah,” Mutsuki, sensing his panic, let out a light, reassuring breath, “you don’t have to.” He swung his legs over the bed, beckoning Chaoyang over to him. Huh? Why did Mutsuki want him to go back? Could it be that he was suggesting he’d… No, no way! Mutsuki just claimed that they should stop, so… Timidly, Chaoyang shuffled over, practically hopping to cover his erection. He knew he looked like a ridiculous little kid, but he was in plain sight for Mutsuki to stare at - how could he not cover himself? “Wh-what is it?” Apparently not satisfied with the distance that still remained between them, Mutsuki gently took Chaoyang by the arms and tugged him closer by his sleeves. The usual soft smile Mutsuki had was suddenly laced with mischief befitting of a Kururugi. “You know, Chaoyang,” Mutsuki said, sliding his hands down his arms, closer to his hands covering himself, “if you had gotten worked up, you should’ve let me know.” “Um, oh, th-there wasn’t a need. I could take of it and besides, you said you were sleepy and wanted to stop, so…” Chaoyang looked at the rumpled sheets, the pretty blue of Mutsuki’s top, his walls, anywhere but Mutsuki who he knew was roaming his gaze over him. Mutsuki usually kept a careful balance between not staring too much at Chaoyang while also trying to get him used to eye-contact and people looking at him. But now Chaoyang was feeling hot and trapped under those scrutinizing eyes, and he had no idea if it was because he wanted Mutsuki to look at him or not. Mutsuki hummed. “It was a long day, as I practiced a new song with Satsuki, so I was already more tired than usual when I came over. But,” slender fingertips traced over Chaoyang’s, teasing what strained underneath those hands, “I probably wouldn’t be a good boyfriend if I let you take care of this when I’m right here.” “M-Mutsu-- Hiih!” Chaoyang jolted, his hands jerking away from his crotch when Mutsuki’s hand suddenly moved in to rub at his clothed erection. “Hmm, what to do~?” Mutsuki mused, and Chaoyang caught the amausement brimming in his voice as he himself tried to stifle his gasps when Mutsuki attempted to wrap his fingers around the bulge. It took some manuvering and no small amount of friction, thanks to the neat fit of his pants, so Mutsuki tugged the waistband down, and not only of his pants but his underwear as well. A shiver crawled down Chaoyang’s body, both from the feeling of his cock no longer being pressed down and from knowing that there was nothing he could do to hide from Mutsuki’s stare now - not unless he wanted to sprint away with his bottoms tugged down. Chaoyang fidgeted, wondering what Mutsuki would do next. Mutsuki could be a tease, but he certainly hoped his boyfriend wasn’t cruel enough to stop now. Thankfully, he was saved the trouble of prompting for Mutsuki’s next action when a warm hand wrapped around his base, an experimental stroke running from there to his tip, making his body shake. His hands, no longer shielding his crotch, took instead to trying to cover his mouth, and the hitched string of gasps and moans trying to escape from there. “My, my,” Mutsuki said, his tone playful, “I didn’t think you would’ve gotten in this state just from making out. Or is it because I’m starting to tease you?” Chaoyang didn’t grace that question with any coherent answer. Although the fact that Mutsuki’s touches now had made him more excited couldn’t be denied, the proof being rubbed and stroked lovingly by Mutsuki’s hand. “Hhh… H-haa…” Chaoyang squirmed, tiny squeaks of undeniable pleasure leaving him when Mutsuki squeezed lightly, the pressure so tantalizing around his sensitive head. Continuing his slow pumps around Chaoyang’s cock, Mutsuki started to unbutton his shirt from the top, nudging the fabric aside to press a delicate kiss at the middle of his chest. He glanced up from under his wavy bangs, barely able to hide his smile when he murmured against Chaoyang’s skin, “Hey, so what is it you want? Would you like me to keep touching you?” “E-eh?” Although Mutsuki was trying to look into his eyes, Chaoyang quickly glanced where his hand was moving between his legs - though that didn’t exactly help his concentration any. What was he supposed to do? Reponding honestly was of course the right thing to do, but it was obvious that “the right thing” wasn’t where Mutsuki’s intentions laid. He was trying make Chaoyang expose his wants, which of course made him panic, but Mutsuki’s hand was also around his dick and his knees were getting wobbly. “U-um-- Ahh, th-that’s--... H-haa, Muts-tsuki-san…” He tried to press his thighs together to keep himself contained as he fought instinct to ask for more - and not just with his voice. His hips too were starting to ache with desire to move into Mutsuki’s soft, warm hand; his whole body threatened to melt into a puddle at Mutsuki’s feet. Giggling, Mutsuki kissed his chest again, where his blush was starting to spread. The sensation of his lips sent another line of shivers over Chaoyang’s body. “Alright, alright,” he said. “I understand. Although I won’t be able to do much since I really am sleepy. Maybe we can compromise?” Mutsuki pulled away right as he finished speaking, leaving Chaoyang flustered and confused. His throat barely closed around the protesting whine that threatened escape when his boyfriend’s hand and warmth left his aroused body. Helpless to even move though, he watched as Mutsuki stacked two pillows and then laid his head down on top of them. For a moment, Chaoyang believed that Mutsuki really was planning to go to bed after all, but when those light-teal eyes fell on him again, they were still overflowing with lustful interest. Nothing was ending quite yet. Noticing Mutsuki’s desire finally started to calm Chaoyang a bit. It would be fine as long as everything wasn’t focused on him, so if Mutsuki wanted to be intimate too, then his fears were unfounded. Replacing Chaoyang’s nerves now were the usual jitters he got from the sensual atmosphere, but it was a sweet mix of elation and anticipation. “Chaoyang,” his name, slightly accented on Mutsuki’s Japanese tongue, was spoken delicately, “come over here.” After a moment of hesitation, he shed his bottoms and unbuttoned top to pool on the floor before obediantly crawling onto the bed, although he was unsure of how exactly Mutsuki wanted him. Usually their positions were doggy style or missonary, positions in which Chaoyang could hide his face in pillows and his arms. Mutsuki being the one on his back was unusual, but maybe Chaoyang was going to top tonight…? On that note as well, when was Mutsuki planning to strip too? Being the only one exposed was - you guessed it - embarrassing. Mutsuki beckoned him once more. “Over here, on me. I want you to straddle me.” “St-straddle?” “Is that too much?” “N-no!” There was nothing to be nervous about if it was Mutsuki. If Chaoyang wanted to try new things with anyone and be more confident with anyone, he wanted it to be with Mutsuki. So, steeling himself, he carefully slung one leg over Mutsuki’s hips. As he tried getting into a position that wasn’t awkward, Mutsuki’s hand came up to his braid to start undoing it again. “What are you doing?” With a goodnatured smile, Mutsuki said, “I like your hair down when we do this. It falls over your bare shoulders nicely.” His fingertips traced down the slightly wavy pink strands, now free from their plait. “You look pretty.” Flustered from the compliments and hand combing through his hair, Chaoyang murmured, “When are you taking your clothes off too?” “Me? I’m not. It’s part of the compromise.” Mutsuki’s hands fell further down, resting on Chaoyang’s hips. His palms rubbed along the bare skin, his expression patient as he waited for Chaoyang to process his words. “You never actually said what the compromise was.” He brought his hands up again in a self-conscious gesture, but was too late to stifle a yelp when Mutsuki’s hand prompted him further up. Helpless, he followed along, his hips nearing closer and closer to Mutsuki’s face. By the time he stopped, the tip of his cock was near enough to Mutsuki’s lips that his breath tickled it hotly. “Mutsuki-san…!” “There. That’s better, right? You just stay like this,” Mutsuki rested his head against the pillows comfortably, “and put your dick inside my mouth. You’d be doing all the work, but you also get a blowjob out of it. Does that sound okay~?” “W-wait you mean I just…? Move myself in y-your mouth?” Mutsuki nodded, and flickered his tongue out. Chaoyang’s cock was close enough that Mutsuki could easily lick at the tip that was slowly beading out pre-cum to get his lips sticky. Chaoyang was...close enough that all he had to do was thrust his hips forward and he’d be shoved between those soft, pink lips. The thought was more than tempting, especially when Chaoyang had past experiences to fuel the heat between his legs, but still… “Here, I’ll get you started.” Mutsuki grabbed his hips and rocked him forward, effectively sliding Chaoyang’s cock into his waiting mouth. It was only partway, just to “get him started”, but Chaoyang was already quivering, his cock twitching at the slick and hot confines of Mutsuki’s mouth. His hands barely covered his appreciative moan, his cheeks flaming from even the muffled sound of it ringing in the otherwise quiet room. An encouraging sound from Mutsuki hummed around his cock, his tongue pushing at the underside of it. He tried to string along Chaoyang to move from his ministrations, insistently lapping at the leaking tip and rocking Chaoyang’s hips closer to shove his cock further down his mouth. Chaoyang was - sensitive, at the best of times, with just mere taps on his shoulder leaving lasting impressions on his skin. And now, every little touch of Mutsuki’s hands and mouth sent more spikes of pleasure shuddering through him, making him lose his ability to think coherently. Heated breaths left him as he struggled to adjust to the feeling of Mutsuki’s quivering throat around him. “A-Ahh, w-wait, Mutsuki-sa-AH!” Chaoyang jolted when Mutsuki pushed his hips back so that he could give a small, languid suck around his head.  “M-M- Mutsuki-san, wait, not so d-deep, your voice will be ruined…!” “Tea is still happening. If I drink that and have some throat spray in the morning, it’ll be fine, right?” Mutsuki smiled up at him, kissing the wet slit of his cock, smearing the pre-cum on his lips to lick off. Chaoyang couldn’t come up with a counterargument for that. More than that, once Mutsuki finally did have the energy to stick to a plan, it was hard to wiggle him out of it. “Come on. Show me yourself now that you want it.” Mutsuki patted his hip, relaxing back into the pillows as he parted his lips for invitation. Oh, Mutsuki really wasn’t going to let him back down out of this. Chaoyang felt completely on the spot, and knew that if he wanted this “problem” taken care of, the only solution was to use his boyfriend’s offered mouth. Usually Mutsuki took lead, but clearly the reins were being handed over, and self-consciousness quickly caught up to Chaoyang as he looked at those few centimeters between his cock and Mutsuki’s lips. “T...Tell me if I…” “Hehe, it’ll be okay. I’ll let you know if it’s uncomfortable. Now come on, my mouth is starting to get dry.” Mutsuki raised a brow. “Fill it with something wet?” Dirty talk like that should’ve made him bury his face in his hands, but despite his stinging blush, Chaoyang let out a nervous laugh. Mutsuki could make him feel comfortable at the strangest times. Focusing his gaze on the slight wetness of Mutsuki’s lips, Chaoyang bucked his hips forward, his cock bumping the corner of Mutsuki’s mouth. He flinched. First time taking the reins and he was already failing. But Mutsuki turned his head slightly, lolling the tip over with his tongue. From there, all it took was another small nudge forward from his hips to plunge himself inside. It felt good. Really, really good. Mutsuki was so wet inside, and his tongue was so slick, his lips so, so soft… They closed around him perfectly when he had gotten a few inches inside, and stunted moans left him as they dragged over his swollen cock. And the way it looked was… Chaoyang glanced up, and Mutsuki was looking back. “D-don’t…” He turned his head away a little to break the eye contact, fingers covering his mouth again, his arms closed in on himself. His hips were feeling funny again, buzzing with heat and prompting him for something more, for movement of some sort but… M-Mutsuki-san is always the one to... Many times Chaoyang had been backed to a wall or fallen back on the bed as Mutsuki moved his mouth over his cock, sucking him in and digging his tongue into the leaking slit. Chaoyang was always far too pleased to let Mutsuki be the one to control the movements but now it was reversed. Just...move in his mouth. That was what Mutsuki had told him. So he should just… “A-Ahh…” Giving in to the burning in his hips, Chaoyang shakily withdrew a bit, but even that slow drag felt wonderful. Saliva and heat stuck to his cock, making him shiver. Mutsuki wasn’t protesting, his hands merely resting on Choayang’s thighs, his thumbs kneading lazily circles into them. His cock twitched right inside at the meeting waves of pleasure, and he gave a protesting whimper at Mutsuki’s amused laugh in his throat. He couldn’t be deterred now, so in keeping with the momentum, he slid slowly right back in to Mutsuki’s mouth, stuffing it full again. The sound Mutsuki made now wasn’t amusement. It was lower, more needy as his fingers twitched into a grip on Chaoyang’s thighs. The sound was so sweet to Chaoyang’s ears, encouraging him to pull back and push in once more, and again, and again. The enjoyment of both parties was clear as their moans puffed out hotly, muffled by hands and a cock. As Chaoyang built up a comfortable rhythm to fuck Mutsuki’s mouth, he noticed that one of the hands on his leg left, moving somewhere behind him. Mutsuki grunted softly around him, and Chaoyang glanced behind to see his boyfriend’s hips bucked up to allow him access to his waistband to shove down just enough for his own cock to spring out and rest on his naval. It was hard, a lovely dark pink covering it that made Chaoyang lick his lips. When Mutsuki started to stroke himself, Chaoyang tried to regulate his breathing enough to speak, but even then it was dripping heavily with pleasure. “D-do you want me to take care of it?” Mutsuki made a sound of disagreement in his throat, his other hand coming up to make sure Chaoyang kept up his thrusting. If anything, Mutsuki seemed to be encouraging a faster pace. Was that really okay though? Chaoyang chanced a look back to his face. Mutsuki’s lips were so slick with saliva and pre-cum, and were beginning to turn red as they were stretched around his cock. And his eyes were… Chaoyang’s breath caught, and he could swear his orgasm crept about twenty steps closer at the look on Mutsuki’s face. A blush hot on his cheeks, his gorgeous eyes glazed with lust… It was a look Chaoyang rarely took treat in because of his fear of eye-contact, of being self-conscious of what he himself must look like when he was being made a mess of. But Mutsuki was… He was really beautiful - and erotic. Seeing such a sight… How was Chaoyang supposed to not want more indulgence in it? Tortured moans leaving him, he started thrusting deeper, his head hitting the back of Mutsuki’s throat. In this faster pace, small wet sounds started to join the chorus of their heavy breaths and pleasured noises. It was a bit embarrassing, the sight of his cock slipping in and out between his boyfriend’s lips, but it was also incredibly arousing, and Chaoyang couldn’t look away. He held Mutsuki’s gaze, his hands curling tighter and tighter, wanting something to hold onto especially with this new pace. “Nngh… H-haa…!” Finally unable to take it, Chaoyang broke his hands away from his face and instead buried one hand into Mutsuki’s messy hair, holding him even more in place as the other clung to his headboard for purchase. Mutsuki looked slightly surprised, but still he remained in place, letting Chaoyang control what happened to him completely, trusting him to finally act on his desires because Mutsuki was letting him know that it was okay. Chaoyang’s cock shoving down his throat and back up to kiss his lips before going back in again - they were such indulgent movements, the method and rhythm leaving them as Chaoyang squirmed more in want. “Ah-ah-ah~ H-haa, uhn-- M-Mutsuki-san, Mutsuki-san, Mutsuki-sa-ahhh-n~!” The breathless babble spilled out lowly and desperately from Chaoyang’s lips, and even if he tried to cover himself with his hands now, there was no saving that he was already losing himself to the incredible sensations. His mind was a muddled mess, tears springing in his eyes as his orgasm raked through his body, fingers tightening in Mutsuki’s hair. Belatedly, he realized he probably should’ve warned Mutsuki, should’ve pulled out… When he did pull back though, cum was already pooled on Mutsuki’s tongue and dribbling down his chin, making a bridge from there to the tip of Chaoyang’s cock. His arm was still moving though, his hand pumping his own cock harder and faster, and now he was free to let out his grunts and sighs until finally his own back arched with his climax. Teeth teasing his bottom lip, Mutsuki rode out his orgasm with quiet mewls. Chaoyang found his hand in his hair drifting down, caressing his flushed cheek. Mutsuki’s debauched expression gave way to come of his usual playfulness as he let out an amused breath. “You really let go there. It felt really good~” Chaoyang didn’t try to deny it, or correct that one of the reasons he liked having sex with Mutsuki was precisely for that point of orgasm where he could forget everything for a few seconds. Bringing his hands back to his face, he glanced away. “S-sorry, I didn’t warn you that I was close…” “It’s okay.” Mutsuki licked along his swollen lips to gather up those stray drops of cum. “I don’t mind swallowing.” Not having much fondness for the taste of cum himself, Chaoyang quickly got up and retrieved his tissues. “Don’t do that! I have these. Ah…” He looked at the mess Mutsuki had made on his shirt and pulled out a few more tissues to give him. “H-here. I, ah, I have a loose nightshirt you can wear and I can, um, w- wash that.” “Hohh? Thank you.” Mutsuki cleaned himself off as Chaoyang got the shirt and the both of them changed. It didn’t look like any mess got on the bed, so that was a relief. “Your throat,” Chaoyang said when he finished buttoning up his shirt. “I’ll go make that tea now.” That had been one long tangent, after all… But Mutsuki pulled him back once again by the sleeve, effectively sweeping him into a hug. It was warm, and tender. Almost immediately, Chaoyang relaxed into it. “We still have time, don’t worry. I want to cuddle with Chaoyang now.” “If we cuddle, we’ll get sleepy… Especially you.” But he was still burying his face into Mutsuki’s shoulder. Mutsuki hummed happily. “Sleep does sound nice…” “T-tea…!” “Yes, yes.” Mutsuki slowly released him, but not before nuzzling into his loose hair and letting out a content sigh. “I hope that this was enjoyable for you.” “It was,” he murmured, his face heating up again. “Ehe, you stared at me when you came, you know. It was really lewd.” “Eep! S-sorry!” “Now, now, there’s no need to be embarrassed…” “I’m making the tea!” “Okay~ Hurry back~” When Chaoyang finally was let go and exited the room, it took him almost a full minute of taking deep breaths in the hallway before he calmed down enough to head into the kitchen. And even then, it wasn’t enough, as Leon loudly asked why his face was so red - to which Noah mentioned when wasn’t Chaoyang’s face red - and Leon protested that his hair was also down from its braid - Rabi told him to stop putting Chaoyang on the spot (which he was grateful for) and Lucas was...looking at him far too knowingly with narrowed eyes. Chaoyang made tea in record time and squeaked out goodnights before dashing back to his room.  Unsurprisingly, Mutsuki was already asleep. Chaoyang stared at him, then sighed, putting the tea on his nightstand. True, he might be hopeless, but so was Mutsuki - completely and utterly hopeless. But, Chaoyang would be lying if he said he didn't love him for it.  End Notes This wasn't even the first pairing I shipped in this game, so the whole existence of this fic is a real enigma. Nevertheless, I hope you liked it :D Since I doubt I'll be leaving idol boy hell anytime soon, you should probably count on other fics from me soon, most likely involving either these two or my other faves, Seiya and Noah o)-) I haven't met everyone in the game yet so who knows what other nonsense I'll ship [aggressively keeps writing fics for fandoms with small ao3 tags] Anyway, happy holidays to all, make to make it a "white Christmas" huehuehue :3c Twitter, @fuwajellyfish Please drop_by_the_archive_and_comment to let the author know if you enjoyed their work!