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Big Brother is the Slut

Summary:

Xichen thinks his little brother"s nipples are really really really pretty.

Work Text:

Xichen was 12 when he first noticed his baby brother"s cute little nipples. His brother was very cute in general so it stood that every part of his brother was as cute.

They had recently started using separate beds but A-Zhan, under his careful promise of secrecy, had started to join him in his bed.

Xichen was a light sleeper compared to his brother. A-Zhan dropped off immediately at 9 and woke up at 5 and not a second before and he had gotten used to his older brother moving often in his sleep.

He wasn"t even sure what had caused it the first time, but he had woken up in the middle of the night and he had seen his little brother"s robes ruffled by his movements. When he had been about to settle them properly, he had caught sight of a pink nipple exposed to the cold Gusu air.

It had hardened to a tiny ball, looking soft and tight at the same time. It was as unbearably pretty as the rest of his brother.


He had parted his brother"s robes a little more before taking the small pebbled nipple in his mouth. He sucked it gently, nibbling and biting it gently every time it almost slipped out of his mouth. He spent the rest of the night in a haze of almost sleep but it was still the most relaxed he had woken up.


In the morning, he startled from his sleep, pulling away from A-Zhan"s soft flesh to hide his puffy, bruised nipple under his sleeping robe.


The second time was more planned. He hadn"t stopped thinking about A-Zhan’s pretty nipples for a while and he had found an excuse to cuddle up to his brother again, much to his brother"s pleasure.


This time, he started minutes after 9, gently parting his brother"s robes to properly enjoy the sight of those tiny nipples. They hardened quickly as Gusu cool air entered from a window he had the foresight to keep open.


This time he rested his head on his brother"s chest, and slowly sucked both of his brother"s pretty nipples. He sometimes pinched and played leisurely with the nipple he wasn"t sucking. He could hear his brother silently breathing a little heavier. He had not noticed it last time but this time, the sound of the soft puffs of air hardened his cock pressed between his body and the hard bed.


He grinded his cock to the bed, still unable to stop deriving pleasure from tasting his A-Zhan"s tiny nipples. They flushed so pretty each time he pulled his lips away. So pink and puffy. His perfect little brother.


Xichen was so glad he could guide and protect his baby brother. He tugged at the nipple, grinding on the bed more greedily. He turned away from his brother"s nipples, sucking the soft skin in his mouth to stifle his moan as he came, warm and wet, between his brother"s legs.

He panted into his brother"s damp skin, his fingers almost unconsciously tugging and pinching his brother"s nipples as he drifted off to sleep.


It happened more often after that.


Even on the days A-Zhan didn"t come to him, Xichen made his way to his brother"s bed, seduced away by the way A-Zhan had started to shift away from his soft inner layers during the day.


Their uncle had told him to take care of A-Zhan if he was having any trouble, so he had been given permission as well. A-Zhan and his soft tempting nipples had not been far from his thoughts all day.

However, even he was surprised to find that A-Zhan"s robes were a little more loose and parted around his chest. He found that he could catch a glimpse of the tempting, greedy nubs that had been painfully out of reach all day. He smiled, gently parting his robes to flick at each bruised nipple.


A-Zhan"s lips parted in a soft sigh.


Xichen had learnt something new recently. After he had "released’ that one time, he had accidentally come across some spring books that had been detained. In one of them, a man had pinched and sucked a woman"s nipples until she had "released’ as well.


Aside from a heavier chest and missing lower parts, he could not tell what the difference between a man and a woman was. So he judged that his cute brother could surely do it too!


He tried for a long time that night. He sucked and bit and pinched impossibly tight on his little brother"s nipples but he did not come. His little cock had gotten hard as well, but Xichen, after being disappointed, did not wish to reward his brother anymore.


He lay beside his brother, sucking his tender, purpling nipple until he fell asleep.


The next day, his brother came to him with a fearful embarrassed look, asking him not to tell uncle before showing Xichen his puffy, bruised nipples. In the light of day, they looked somehow even worse.


Xichen pretended to inspect them, holding and squeezing his chest to his leisure. He flicked the nipple gently, causing a soft gasp to leave his little brother"s lips.


“ Did I hurt you?” Xichen asked immediately. A-Zhan shyly, confusedly, shook his head. Xichen saw his brother"s little cock fill out a little, something his brother clearly did not notice. He held his brother still, using both thumbs to caress the nipples.


“It seems injured, A-Zhan. Did you touch them?” He asked, still stroking them gently.

A-Zhan was subconsciously pressing his chest closer to the delicate touch of his thumbs. But he answered by shaking his head vigorously, even as his breathing became heavy. His eyes went teary as well, and Xichen"s cock twitched visibly. His baby brother didn"t notice, eyes fluttering a little as his chest felt good.


“I- I,” Xichen pretended to hesitate, “perhaps I should kiss your injury like A-niang used to. Would you mind that, didi?” His little quiet brother shook his head trying feebly to not shake in his firm grasp even as his little cock started to create a wet spot at the top of his cute bulge.


Xichen sat down on the bed, pulling his brother close before gently brushing his lips to kiss one nipple very very softly. A-Zhan made a hiccuping sound.


Xichen stuck out his tongue licking his soft puffy nipple one from an inch below to one inch above. Before kissing it again. He looked up at A-Zhan, his deep breaths teasing the wet nipple.


“Does it feel better?” He asked. A-Zhan shook his head then nodded. “Should I keep going, didi?” A-Zhan hesitated before nodding.


He internally cooed at how sweet his brother was. He was taking a little advantage, by calling him didi and reminding him of their beloved mother. But he was doing it for A-Zhan! His innocent brother needed to be protected after all!


He kissed and licked both the nipples, careful to keep his teeth away. He pulled his brother close, closer in fact, so his tiny wet bulge could press against the low bed between Xichen"s parted legs.


The first time A-Zhan let out a moan, Xichen paused again. Gently kissing the tight bruised nipple a few more times before lifting his head in concern.


“Is something wrong? Does it feel better?” He asked, concern lining his voice. A-Zhan was panting more, eyes filling with more tears as his little cock kept grinding on the wooden bed and his older brother obliviously kept stroking his hurting chest.


He shook his head and nodded, his little chest heaving as he kept rubbing his little cock again and again on the wood.


Xichen was so pleased at his little brother"s progress. He was truly so good at following his older brother"s guidance. He ducked his head back to his brother"s tiny bruised buds. This time though, he was a little less nice about it.


He grazed his teeth occasionally pinching and pulling with his fingers when he thought he could get away with it.


His little A-Zhan arched into his touch, his hips rocking unconsciously and Xichen showered his little brother"s abused nipples with his attention. He couldn"t stop himself from licking each soft bud, feeling the round tightness against his tongue.


His A-Zhan"s body was so sweet to him. He didn"t even take long to come in his pants, whining as Xichen kept sucking his nipple long after he had released. His thumb irritated the other bruised nipple with slow strokes.


“Is something wrong, A-Zhan?” He asked curiously, as if he had not noticed the whining and grinding. His innocent brother"s eyes were red, looking as close to crying as he had seen it.

"Ge..." he whispered back, shivering pitifully.


“What"s wrong, didi?” He asked, his thumbs pinching at his brother"s sensitive nipples even now, as his little brother squirmed to get away. He let his brother pull away enough to drop his eyes down and gasp.


“Oh, didi!” He exclaimed almost mockingly. He hurriedly pulled down his little brother"s sleeping pants. There his brother"s little cock was soft, but he had released.

It was far more watery than his had been. He clutched his brother"s hips and dropped to his knees. His mouth was close to his brother"s tiny cock as he smelled and pretended to check what he had done.


“A-Zhan,” he said, disappointedly, “I think I know what you are.”


A-Zhan, who was still sensitive to disapproval and the cold wind to his nethers, burst into tears and apologies. Xichen coaxed him down, telling him he would hide away A-Zhan breaking the rules, that he would help his brother now that he knew what his brother was.


“Wh-what I am?” His little brother asked innocently.


“A slut,” Xichen answered back, feeling smug. “My little A-Zhan is a slut. So we have to hide this away okay? We cannot tell uncle. He will punish you, he might even throw you out of the Sect! There"s no way I will let my little brother come to harm. I"ll protect you and show you how to do this, okay?” Xichen calmed him down.


A-Zhan was so incredibly hurt at being told he could be abandoned by his uncle, but he was a smart boy so he nodded obediently to his older brother"s words.


By then, his little cock had become sticky. So Xichen bent close to lick the area, cleaning off the wetness with excuses about how uncle would know if they wiped it clean. His little brother could not continue. Xichen got his lips around that tiny cock as well, laving it with affection and sucking it gently from root to tip.


He did it slowly, unknowingly teasing his little brother as he learnt how to do it properly. He enjoyed the feel of it on his tongue. The taste of it was odd, but knowing it was his brother"s made him feel good again.


The cock twitched and hardened and his little brother was frozen stiff as Xichen greedily licked and sucked his cock. He didn"t know much so he clumsily kept at it until his little brother released again in his mouth.


When he finally pulled away and helped him dress, he reminded his brother to keep it a secret.
They kept it a secret.


As often as he could, Xichen would go to his little brother before 9 to suck him off once, and when he fell asleep, he would take his brother"s nipple in his mouth and fall asleep biting it.


As they grew up, his brother stopped being as shy or heeding Xichen"s instructions. He was now fully consumed by the identity his older brother has put on him.


A-Zhan was a slut, and only his brother could help him. Lan Zhan learnt to keep his brother"s head down on his cock, grinding his growing cock into his older brother"s throat. He started to enjoy the soft whines that left his older brother"s throat, and was content to being woken up with his brother sucking his balls or nipples leisurely.


His nipples had grown soft and stretchy but also extremely sensitive with his older brother"s continual obsession with it. Xichen just wouldn"t leave them alone- tugging and pinching and kissing and licking. He ignored the reddening of his brother"s eyes or the sounds that left his throat, as if content to play with his little brother"s nipples for ever.


Since they had started before A-Zhan had his golden core, it seems to have expected it to be his normal state of being. Whenever he healed up too much, his nipples would feel even more sensitive. Once he had been hit on his chest on a night hunt and it had thrown him back into a tree.


The people there assumed he had been injured, which was why he lay there for a while instead of getting back up and attacking. In truth, it was because his nipples had healed up too much without his brother sucking on them and had been overly sensitive. Even with the padding he had learnt to put, that single hit had made him come in his pants like a child.


His older brother had slapped his nipples a hundred times as punishment and made him go about sect duties for the next week without his regular chest padding.


The soft Gusu silk slid against his nipples with every step, tugging at them as he sat, rubbing almost violently whenever he trained his sword. At the end of the day, his brother licked all his release from his pants and cock before settling them down to suck on his brother"s nipples as had become their norm.


His nipples weren"t the only changes as he grew, however. A-Zhan"s once little cock had managed to grow bigger, into a girthy, veiny thing that made Xichen struggle to breathe as he took it to the root. Xichen had to press his fingers inside his hole to pleasure himself each time his mouth tightened over his little brother"s rather large cock.


A-Zhan never minded, always eager to discover something new his older brother wished to try. His older brother had made many of his regular handstand punishments (for being a slut) rather more fun since he realized he could do them in the Hanshi while naked.


A-Zhan had recently started to help his older brother"s punishments as well, stroking and licking open the tiny hole hidden behind his balls. Since Xichen had discovered that A-Zhan"s cock was growing to be significantly larger than his own, he had started to teach A-Zhan to pleasure his hole instead of his cock every day.


It had been particularly rewarding as his hole grew more and more sensitive like A-Zhan"s nipples. He couldn"t wait for the day A-Zhan would only need to slap it a few times to make him come. From A-Zhan"s expressions during his 100 hit punishment to his nipples, Xichen was rather eager to experience something similar as well.


But before that, they had to celebrate another occasion first. On the day A-Zhan received his courtesy name "Wangji’, Xichen had been far too busy the entire day and had been unable to wake his brother up by sucking his cock. He had been rightly angry at this older brother for this slight, of course.


The moment Xichen had entered his Hanshi after the busy day, A-Zhan had grabbed him by his hair and pushed him to his knees before stuffing his mouth with cock. Xichen"s surprised, choked noises were swallowed under his little brother"s relieved groan.


A-Zhan furiously fucked through his brother gagging on his cock, pushing in deep until Xichen"s lips were tight against the base of his cock before yanking his head off his cock by Xichen"s hair.

He closed his eyes tight, groaning deeply as he felt the familiar sensation of his brother"s throat closing up on the head of his cock, of his hands scratching almost desperately into his thighs as he grinded in too deep. He loved the noises his brother choked out, the soft whines he barely even realized he was making.


Xichen had been right, all those years ago. He was a slut.


He forced his cock deep into his brother"s thrust, enjoying the feeling of having his older brother completely at his mercy, before he pulled out and furiously pumped his cock a few times. He rested the tip of his cock just inside his brother"s puffy lips before coming.


His brother only had moments to enjoy the taste of his brother"s come, licking the tip gently before a thinner, stronger stream started to leave the tip of his cock.


Xichen"s eyes widened in shock at the familiar taste, but he couldn"t take his lips off his brother"s cock as his petulant little brother pissed in his mouth. There was a familiar sound of steps on the walkway and A-Zhan"s stream of piss slowed down.


Xichen glared furiously at his smug brother as he licked the tip clean again before wincing at the taste in his mouth. Unlike A-Zhan who seemed to delight in these indulgences, Xichen did not like to do this. He had only agreed two years ago due to his little brother begging him for a month straight, and had since denied it.


This time, not only did he not have time to wash his mouth, he had to sit and talk to his uncle while drinking tea and swallowing the bitter taste his uncle favored with his little brother"s piss.


Xichen was furious.


He was also very hard.


Yet another thing he would have to pretend to ignore as his little brother tucked his cock in and helped Xichen fix his hair just in time for their uncle to knock.


Truly, his little brother was a complete slut.


Their uncle"s visit was surprisingly short as he praised his nephews before allowing them to retire.


Xichen didn"t spare any time in whipping his sword out to hit A-Zhan on his nipples. His little brother winced but obediently stripped his robes under his older brother"s glare.


He took off the soft padding for his nipples as well, exposing his oversensitive pink nipples.


“Do you know what you did wrong?” Xichen asked, still glaring. A-Zhan stayed quiet, eyes looking outside instead.


Xichen glared harder.


“Give me your sword,” he said and A-Zhan turned to him with wide eyed surprise.


“Brother!” He protested.


“You broke the rules, so you should receive punishment,” Xichen said firmly. A-Zhan face fell before handing over his sword.


Xichen grabbed a candle before moving closer to his brother. His nipples were a twin of high eager peaks greeting him enthusiastically. Xichen licked his lips before kissing both gently.


Then he unsheathed Bichen and pressed the cold blade flat on one nipple and raised the tip of the candle to the other tempting peak. A-Zhan threw his head back. After moments of pleasure, it was overwhelming pain as his spiritual energy attempted to heal the nipples to the “correct” sensitivity level all the while the opposite temperatures burned at the two sensitive spots.


When A-Zhan let out the softest pained breath, Xichen let go of both objects, taking the burnt nipple into his mouth and infusing his own spiritual energy into the injury. Before he was completely healed, he pulled away before pressing Bichen to the burnt nipple and raising the candle to the soft frozen one.


A-Zhan let out a groan, something that would have been a sharp scream from anyone else, and Xichen watched eagerly as he held himself perfectly stiff, taking his punishment properly even as his cock bobbed eagerly for attention.


After Xichen had mutilated his little brother"s nipples, he stripped and sat on his brother"s lap, and then he sucked them alternately- hot, then cold, then hot- until his nipples were healed up.


His brother"s hands were on his ass, squeezing them tightly and littering them with bruises as his cock brushed gently against his sensitive little hole. He hadn"t been licked open yet and Xichen had not given him permission, so the only thing A-Zhan did was temptingly rub his cock against the sensitive rim, aware of exactly how much pleasure Xichen was deriving from it, after all, he was the one who played with his older brother"s hole the most often.


So when Xichen took his lips off his nipples and snarled, “just put it in already”, A-Zhan did not pretend to misunderstand. His large hands had already kept Xichen"s ass parted, and the tip of his cock was already teasing Xichen"s hole, so he forced his cock into the tiny dry hole, and bit back the moan as the tip of his cock was almost squeezed in half.


Xichen held onto his younger brother"s shoulders and let out a dazed high pitched sound as his hole was split open on his brother"s huge cock. It was thanks to their regular sessions, that he could even insert it at all, instead of just rutting uselessly against his hole.


A-Zhan forced it all the way in, in one go, squeezing Xichen"s ass so tightly that he whined, into A-Zhan"s chest. He curled into his brother, lips seeking out A-Zhan"s nipples while A-Zhan fucked into Xichen"s tight hole with the entirely of his cock, pulling away just enough to tease Xichen"s rim, splitting it wide, before slamming back in entirely.


Xichen gasped a loud, whining sound in his throat as he pummeled his well abused sensitive spot inside. A-Zhan had brought Xichen to orgasm multiple times with just his fingers or his tongue after all, fucking leisurely into the soft hole with his tongue, sucking the rim, and pinching the sensitive spot between his fingers until his older brother screamed loud enough to wake the dead, if not for the wards erected around the Hanshi years and years ago.


A-Zhan knew exactly how to drive his older brother mad. He had been waiting for this day for a long long time after all.


Xichen, cock drunk and drooling, could only be grateful that he had made his innocent little brother believe that he was a slut. He was never letting his brother"s cock go. He couldn"t imagine how big it would be when it was a full size.


Yes, he should just keep it inside him. He had to keep his A-Zhan warm and safe inside him after all. Had to make sure his nipples were cared for and his cock was warmed properly. It was an important duty as his older brother.


A-Zhan meanwhile listened to his brother blabber and fucked his hole even harder, satisfied at the mess his older brother and his tiny tight hole made.

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