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Kaeya knows that he shouldn’t do that. He absolutely does know that this is wrong, especially because he is the trustworthy Cavalry Captain of the Knights of Favonius. Though… he is probably using this title to his own benefit.
It all started that night.
“Hi! Sorry for keeping you waiting!” Aether asked Kaeya to meet him in the tavern, he quickly apologized himself as he took the seat in front of Kaeya.
“No problem, dove.” Kaeya poured more wine into his wine’s glass, taking a sip as he hummed while feeling the drink give the usual burning to his throat. “So, why’d you called? Anything bad happened?”
“Actually, no.” Aether smiled nervously, not wanting to look at Kaeya once. He didn’t have the courage. “I wanted to invite you here so we could party before I go to Liyue.”
So he was right. Something bad really happened.
What was that? Kaeya could understand that Aether had to continue on his journey to find his sister, but why now? Couldn’t he continue that after Kaeya died? They were finally getting to a place, they were finally building a strong bond between them, and now Aether wanted to end all of that? He couldn’t let that happen. Not when he finally found someone to keep him amused.
“You’re going to Liyue? When? Next week?” Kaeya wanted to stop his bouncing leg, but his anxiety didn’t let him.
“Tomorrow.” Aether knew that that was saddening Kaeya, especially because they were always going out together to beat some hilichurls and bonding. However, he couldn’t stop just because he didn’t want to leave his friend behind. He couldn’t let anything hinder his journey in finding where his sister was.
“Tomorrow?” What did he mean by tomorrow? Why so fast? Kaeya couldn’t understand. Did Aether want to go away so much?
“Well, yeah. I spent too much time here. I wish I could stay here longer, but Barb– Venti told me that I should get going if I want to talk to Liyue’s archon.” Aether’s expression also expressed his sadness, but Kaeya knew that Aether wasn’t as sad as him.
Kaeya is lost now. What would he do to make Aether stay? He couldn’t think of any excuse to make him stay forever. Yes, days or weeks wouldn’t be enough. He wanted Aether to stay with him forever. While he was thinking, an idea popped. There was no choice, no matter what possibility he thought of. Kaeya was surprised at himself, since he was willing to steal Aether’s freedom for his own benefit.
“What a shame. And here I was waiting for the perfect opportunity to ask you on a date.” Kaeya put his chin on the back of his hands, grinning, as he saw Aether gasp.
“A-A date?!” Aether said between coughs, finally composing himself after some seconds. “But–”
“So since you’ll be going tomorrow, why don’t you go to my house? I prefer partying there instead of here.” Kaeya caressed Aether’s rosy and hot cheeks, smiling as he felt the traveler flinch. “It’s too crowded here, if you see what I mean.”
Aether was too stunned to speak. He would never guess that Kaeya, the Cavalry Captain of Knights of Favonius, liked him that way. He knew that Kaeya was all flirty, but he would foresee that he was being serious. However, since he was going to Liyue tomorrow, it wouldn’t hurt if he went to Kaeya’s house. It wasn’t like they were going to fuck, anyway. It was just a friendly invite… right?
“Well, I guess I could go…” Aether avoided looking at Kaeya’s blue eyes, still shy around the captain.
“Great. It’d be my pleasure to have the Honorary Knight at home.”
The moment Aether stepped on the living room’s floor Kaeya put a cloth soaking wet with pure alcohol on Aether’s nose, which instantly made him go unconscious.
“Sorry, little dove. You can’t go anywhere.” Kaeya whispered as he got Aether’s limp body to hold with his arms, putting him on the bed and looking at the pretty face of the traveler. It looked like he was peacefully asleep.
Kaeya started humming as he got some old, yet useful things inside a special box he had at home, grinning as he saw the chained collar. He put it around Aether’s neck and attached it to the wall, limiting Aether’s mobility. As he made sure everything was ok and that Aether wouldn’t escape, he grinned at the sight of an unconscious Aether with a metal collar around his neck, connected with a medium-sized chain, attached to the wall. Humming a happy song, satisfied with his successful plan, Kaeya went to the kitchen, bringing a glass of water with him.
“Wake up, Aether.” Kaeya whispered, gently shaking Aether’s shoulder, smiling when he saw Aether showing signs of waking up.
“W-What happened?” Aether’s eyes weren’t completely open, since it was too bright, but he could still see Kaeya holding a glass of water. He sat. Maybe that would help him to think. “Everything went black and my consciousness… Wait, what?”
Aether’s eyes widened as he saw a chain connecting the wall and his neck. He was absolutely confused. Why was his head so slow? Why were his eyes hurting from the brightness of the light? What was that heavy collar around his neck? And more importantly… When did he have the time to lay on Kaeya’s bed and sleep? Something was not right.
“Sorry. I know you’re pretty dedicated to finding your sister, so I know you would leave to go to Liyue no matter what I say. This was the only way to keep you here, Aether.” Kaeya caressed Aether’s hair, who moved backwards, scared.
“You kidnapped me.” Saying that out loud was more terrifying than he thought it would. He didn’t believe it, after all. How could he believe that the trustful Cavalry Captain kidnapped him? “This is a prank, right?”
“Unfortunately, no,” Kaeya offered the glass of water. “drink this, you’ll feel better.”
“No,” Aether refused, putting the glass away with the back of his hand, still trying to process what was happening. “Let me go, please.”
“No.” Kaeya sighed as he put the glass on the bedside table. He knew this wasn’t going to be easy.
“Why? I need to go! Let me go, I need to find my sister!” Aether struggled to free himself, miserably failing. The chain was so short that he couldn’t even leave the bed. He wanted to get something to break the collar, to– yes! Why didn’t he think of using his elemental powers–
“If you use your anemo powers I will bring Amber to keep you company.” Kaeya leaned on to whisper to Aether’s ear, the seriousness in his low and deep voice showing how wholehearted he was about it.
Aether immediately stopped struggling. He would never put Amber’s life, or anyone’s life, in danger.
“Why are you doing this…?” Aether’s back was leaning against the bed’s backboard, his head hanging low as he tried to think positive things. He needed to think that he would get away from Kaeya. He needed to think that he was going to find Lumine, that he was going to make it. But he couldn’t stop trembling from fear right now.
“Don’t be scared. I’m not a monster, and I’m not going to hurt you.” Kaeya held Aether’s chin, smiling as he saw that Aether didn’t try to get away from his grip. “But to answer your question, I’m doing this because I love you. I need you here with me, dove.”
Aether’s cheeks were already getting hot from the words alone, but he almost burned when Kaeya pressed his lips against Aether’s. He had never kissed anyone, so he was so embarrassed. What should he do, especially in the current situation? Should he try to struggle? No, but it felt too good… Aether decided to simply close his eyes. After some seconds like this, Kaeya moved away and admired how pretty Aether looked with his eyes shut and pink cheeks.
“Open your mouth.” Kaeya’s voice was as smooth as usual. It was like nothing unusual was happening. It was like they were on their honeymoon, and not in a captor-captive relationship.
It was so embarrassing. Aether had always liked Kaeya’s voice, and this time is not different, especially because it seemed sweeter than usual. He shouldn’t give in so easily, yet he couldn’t even think of hurting Kaeya. He was his friend. He helped him a lot, and he always brightened the mood with his jokes. If Kaeya was doing that because he loved him, then Kaeya wouldn’t hurt him. People don’t hurt their loved ones.
“But…” Aether slowly opened his eyes, hesitant of what he would see.
“My love, I am being kind enough with you. I didn’t even tie your hands.” Kaeya’s hands gently grabbed Aether’s waist, bringing him down so he could lay on the mattress instead of sitting against the bed’s backboard, positioning himself on top of him. “Why don’t you leave everything to me?”
“Leave everything with you…?” Aether was confused. He didn’t fully understand the reason behind those words.
“Yes, princess. I know you must be tired of looking for your sister so desperately.” Kaeya fixed a messy lock of hair, putting it away from his face.
And Kaeya was right. Sometimes Aether thought of giving up. Sometimes Aether just wanted to lay on the bed and sleep. He could feel how heavy and numb his entire body felt every time he laid on bed to rest after a long, busy day. Sometimes he just wanted to stop looking for Lumine. Kaeya could see right through him, gentle enough to offer himself to make Aether rest. Maybe being kidnapped wasn’t so bad.
“Ok.” Aether did what the Captain asked him previously, slowly opening his mouth, surprised at how fast Kaeya’s reaction was, as he felt his tongue entering his mouth, quickly wrapping around his own tongue, deepening the kiss as the seconds ticked away.
As the kiss kept going, Kaeya’s hand went to Aether’s pants, lowering it along with his underwear, which made Aether startle a little due to the sudden action. Aether didn’t try to stop him whatsoever, curious about what Kaeya was going to do.
“Mmph!” Aether moaned between the kiss, in an instant looking below, feeling his cheeks getting even hotter, as he saw Kaeya’s big hand wrapped around his cock, slowly pumping it.
“You’re wet already. How adorable.” Kaeya grinned before licking and sucking Aether, most likely giving purple and dark red hickeys.
Aether was too embarrassed to hear himself moaning like a slut, but he couldn’t help it. He didn’t even remember when was the last time he jerked off, and he obviously never had any experience of someone jerking him off. He could only arch his back every time Kaeya pumped his cock, moving his hand faster and rougher every moan he let out.
“Looks like you’re enjoying it.” Kaeya whispered in his ear. “You’re gonna love this, then.”
Aether gasped out loud when he felt two fingers thrusting into his entrance, deep and rough in the first attempt. The traveler put his hands on Kaeya’s shoulders as he completely gave in to the new feeling dominating his body, the pleasure of the fingers thrusting into him, the wet slaps from the thrusts and his cock being stroked was too much.
“You’re so fucking tight. You never fingered yourself before?” Aether shyly nodded, making Kaeya on cloud nine, since he was the first one to pleasure Aether like that.
And the moment Kaeya kissed him, Aether couldn’t stand all of the pleasure, spasming as he felt ropes of cum shooting out of his cock, in Kaeya’s hand. Panting, with eyes closed as he tried to recompose himself, he didn’t even notice anything until it was too late.
“W-Wait, I just– I’m full…” Aether put his hand on his belly, feeling the small bump of Kaeya’s cock inside of him, completely filling him. He was so wet from the previous stimulations that Kaeya’s entire cock easily slipped inside and Aether just noticed after he felt his insides full.
“You’re so good, so good.” Kaeya tried to not cum already. He was fulfilling his wish of finally being able to fuck Aether, after all. Also, his insides weren't helping, clenching around Kaeya’s cock even though his hole is tight already.
Kaeya slowly pulled his cock out, almost all the way, leaving the tip of his cock nestled inside just to slam it back inside Aether, who moaned out loud. Even though it was just the start, Kaeya’s thrusts were rough, reaching the deepest places inside Aether, the smack of their bodies coming together with each rough thrust echoing in the room.
“Tell me, sweetheart. Are you willing to stay with me forever?” Kaeya kissed Aether’s forehead, not stopping from pounding into Aether.
“Hngh! I– I!” Aether mewled every time Kaeya hit his sweet spot, making him put his tongue out and his eyes roll. “Y-Yes! Make me forget about my sister, hah-ah!”
“Of course, my love.” Kaeya started to rail Aether into the mattress even faster than before, each thrust making Aether’s limp body snap back just a bit.
Aether couldn’t believe that he was being fucked by his captor. He couldn’t believe that he was letting him do this with him. The worst part was that he felt too good. Aether was right. Kaeya wasn’t a bad guy, he was just making him feel good.
“What is it?” Kaeya’s question startling Aether. Was it so obvious?
“I was just– hngh! Thinking that I’m letting my captor f-fuck me.” Aether answered between moans and whines, looking anywhere but Kaeya’s face, like he could try to ignore the shame he felt about the fact that he was even liking the idea of being railed by his captor.
“You can try to hide, but you just clenched around my cock, you know?” Aether whined as he heard Kaeya’s deep and low voice against his ear. “You can’t actually hide that you like the idea of taking your captor’s cock so well.”
“F-Fuck!” Aether closed his eyes, clenching around Kaeya’s cock again as he heard the bitter, yet sweet truth, his hands scratching Kaeya’s back as he couldn’t stand all the pleasure the thrusts and the words given to him.
“Such a slut, being so submissive to me. I’m glad I stole you from everyone. This way I can make your insides engrave the shape of my cock.” One of Kaeya’s hands gripped Aether’s hips, while the other slightly choked Aether. “I’m going to fuck you so many times. You’ll start begging for me to fuck you like the good boy you are, won’t you?
“Hngh! Yes! Please, fuck me, Captain Kaeya!” Unconsciously Aether’s hips started to move, trying to meet Kaeya’s thrusts.
“You…!” Kaeya grinned with Aether’s audacity to tease him with his title, as his thrusts started going more erratic, as he finally unloaded deep inside Aether, making the traveler take his seed like a good slut while he kept thrusting his cum deep into Aether.
“Kaeya!” Aether wrapped his arms around Kaeya, satisfied with the feeling of being completely filled with Kaeya’s hot cum, spasming a little with each spurt of cum he felt.
With Kaeya’s cock still buried into him, Aether was panting, trying to recompose himself.
“I can’t wait to break you even more, my little sex slave.”