Dain Aetos X Reader - Blog Posts

Off Limits

Pairing: Dain Aetos x Riorson sister!reader

Summary: What happens when Xaden finds out about Dain having a relationship with you and makes it clear his sister is off limits?

Word Count: 3.5k(I went a bit overboard on this one!)

Warnings: angst(?), suggestive themes, cursing, fluff

Author's Note: Thank you to everyone who showed love on my first Fourth Wing fic I love you all sm! This was requested by an anon and honestly I had way too much fun writing this one so I hope you like it anon! 🤭Hopefully my writing is a bit better on this fic!

Not proofread so please be aware of typos! Hopefully you all enjoy and don't forget my requests are open. I'm hoping to post the first part to my oc story soon and also work on a few requests :)

***as always likes, comments, and reblogs are always appreciated***

The sparring gym was empty with the other cadets filtering out and heading in different directions in a sea of black. You and Dain remained behind to get one of those moments where it was just the two of you. Not only were you Xaden Riorson's sister, which came with its own challenges, but Dain was your wingleader and fraternization between a Cadet and their chain of command was strictly prohibited by the Codex, so you and Dain were forced to keep your relationship a secret until he graduated. The only people who knew were your squad. Dain stood before you, rolling his shoulders and looking infuriatingly at ease. Your eyes wander over his bare chest and down his sculpted abs. Gods how could he look so perfect covered in sweat? You thought to yourself. "You sure you're up for this Aetos? You're looking a little tired," you remarked, taking your place in front of him. Dain's lips quirked upward in a smirk. "Oh I'm sure," He took a lazy step forward onto the mat. "But I appreciate the concern," He added. "Whatever I just don't want you using being exhausted as an excuse when I win," You retorted playfully while shifting into your stance. "Show me what you've got then Cadet," he chuckled softly.

You struck first, fast and decisive just like he taught you, aiming for his ribs. Dain deflected it effortlessly without so much as shifting his stance. "That was predictable," he said, the two of you now circling each other. "I'm just warming up," You grinned. You feinted left and saw Dain's body shift to block the incoming blow, and you shifted your feet to the right to aim a well placed kick on his thigh earning you a grunt that sent shivers down your spine and made your body flush. Is now really the time to think about your wingleader in such a fashion? Your dragon sent down your bond, half-teasing half-disapproving. You rolled your eyes but said nothing ignoring that she was right. "Is that all you've got?" Dain teased, recovering quickly. You huffed, going in for a palm strike and Dain grabbed your wrist before your strike could land. He twisted your arm gently and spun you so your back was pressed against his front. "Nice try but you're allowing me too much time to counter," he whispered, his lips pressed against the shell of your ear. Your pulse raced and not because of the fight. Dain let go of your arm and stepped back. "Try again," He said, playfulness dancing in his golden brown eyes. "Are you enjoying yourself?" You asked. Dain smirked. "Immensely," He threw a half-hearted swing with his fist, leaving his middle exposed. You ducked under his arm and instead extended your leg, attempting to sweep his legs from under him. He dodged easily and hooked your balancing leg from under, causing you to hit the mat. "If you wanted me on my back Aetos you know all you had to do was ask," you flirted, springing to your feet.

You saw his eyes darken at your suggestion and you used his brief hesitation to lunge forward, aiming a strike at his side. His arm shot out, once again grabbing your arm but you used the opportunity to drive your knee into his midsection. He quickly caught your knee before it could do any damage to his ribs, and his eyes sparked with approval. "Better," He said. He lets go of you and steps backward. “Let's see what happens when I stop taking it easy on you,” He smirked. The next exchange was faster, sharper. He let you once again press the attack but any strike you attempted to land on him he countered with precision. And worst of all-he seemed to be enjoying it.

“Your stance is slipping,” he noted, as he effortlessly parried your next strike.

“Your mouth is slipping,” You shot back, unable to come up with anything better.

“Oh, you like my mouth just fine from what I remember last night,” He flirted.

Your next punch came faster than expected, grazing his jaw slightly. His eyes darkened, his pupils dilating with something you weren’t sure was irritation and you smirked. “That was decent but I wouldn't get too confident just yet," He said. Then he was moving fast, too fast. He pressed the attack now, his movements controlled and methodical leaving you with barely any time to dodge or block his strikes. His palm grazed your rib as you just barely twisted away, your breath coming faster. “Getting tired yet?” Dain asked, his voice way too casual. “You wish,” You taunted. He smirked and you took advantage of the distraction to aim a well-placed palm on his chest, driving him backward. You only just barely managed to shove him backward, his dense muscles working for him(in more ways than one) but you caught a flicker of surprise in his gaze. You carried it through with a high kick to knock him down but he caught your ankle, swept your leg, and you fell backward. He caught you before you could hit the mat too hard and trapped your body beneath his. He still had hold of one of your legs, holding it gently by the back of your calf and he pinned your wrists above your head with his other hand. You struggled against his grip but it wasn’t much use; he was bigger, heavier, and worse-entirely too pleased with himself as he smirked like he won something far better than a sparring match. “Not bad,” he murmured with his face just inches above yours. “But not quite good enough.” “You’re enjoying this way too much,” You remarked, your pulse quickening as he leaned in slightly.

His gaze flickered briefly to your lips and his smirk softened. “Maybe.” Before you could fire back with another retort, he pressed his lips against yours. The kiss wasn't rushed; Dain never rushed he was too controlled for that. The kiss was slow, certain, and firm as though he had already decided this outcome like he had the fight. His lips moved against yours with slow precision, savoring the moment. He wrapped your leg around his waist and ground his hips into you slightly, eliciting a moan from you. He pulled back, his lips ghosting over yours and staring at you with those brown eyes that caused you to melt. “Now that,” he murmured. “was a win.” You exhaled, a smile forming at the corner of your lips as you stared up at him. “Cocky bastard,” you teased. “Care for a rematch?” He smirked, sitting back on his heels. Before you could answer a voice rang out across the gym.

“Am I interrupting?" The voice was low, lethal, and way too familiar and it caused you to freeze underneath Dain. You look over to see your brother standing off to the side with Garrick next to him. "Xaden!" You squeaked. "Get the fuck off my sister Aetos," Xaden growled. His shadows surged forward, dark tendrils ripping Dain off and away from you and Dain slammed onto his back. Simultaneously, his shadows wrapped themselves around your wrists and pulled you backward away from Dain until you stopped at Garrick's side. "Xaden what the fuck!?" You exclaimed, your initial shock being replaced with indignation. You look up at Garrick who only offered a somewhat apologetic smile. Your brother didn't even glance at you, his entire focus on Dain who was picking himself back up with a clenched jaw. "You overstepped Riorson," Dain snapped. "I don't give a damn if she's your sister you don't get to pull that shadow shit with me," He said, his voice rigid. "You know Aetos I'm a bit surprised you had the audacity to go that far, " Xaden took another step forward, his shadows swirling around his feet. "I didn't think you'd be stupid enough to shove your tongue down my sister's throat," Xaden's voice dropped. Her face flushed with embarrassment and you felt Garrick shift beside you, a little uncomfortable. You watch as Xaden stares daggers at Dain and suddenly you weren't sure you recognized your own brother. The man standing in front of you was no longer the older brother who always looked out for you. Instead he was every inch the soldier that Basgiath had forged him into. For the first time in your life, you understood why so many people were afraid of him.

"What the fuck did you just say?" Dain's voice was tight but unwavering. "You heard me," Xaden replied. "And in case you forgot who she was I'd like to remind you who's been protecting her this whole time," Xaden's eyes smoldered with rage but Dain didn't flinch. "She's not your possession Xaden." "No she's not but I am her brother and that makes it my responsibility to make sure she doesn't end up in a situation she's going to regret when she gets hurt," Xaden said, his eyes narrowing. You stood frozen. Xaden said when not if. Does he really think Dain would ever hurt you? You looked up at the hulking man who stood beside you. "Do you think Dain is something I'd regret?" You asked Garrick. Garrick was one of your friends, going back to when you were kids and he always let you tag along with him and your brother, and you knew he would be honest with you. Garrick glanced down at you, hesitating for a moment unsure if he wanted to get involved. "No, I don't think so. But he and Xaden barely tolerate each other so seeing him with you was probably more of a shock than anything," he replied sincerely. "You deserve to be with someone who treats you right and loves you. And Dain seems to love you especially if he's willing to go toe to toe with Xaden to defend you," You smiled and he returned the gesture before Xaden and Dain's voices pulled you back. "I don't need your permission to do anything with her. I certainly don't need you to remind me how to treat her right. And I'm not going to be scared of you and back down like you want. Ever. Not when it comes to her," Dain growled and your heart seemed to stop. Xaden's shadowy presence seemed to grow even more oppressive as he stalked closer to Dain, their faces inches apart. "You're walking a fine line, Aetos. You think you can just play these games with her? Pretend like you're her hero while you're distracting her from everything else around her?"

Dain's nostrils flared and for a split second it seems like they may actually clash with each other. As much as you loved Dain, you weren't entirely sure he was a match for your brother. You opened your mouth to intervene when Professor Devera walked into the gym. "Professor Tavis? Professor Riorson? You're needed to attend a meeting with the other professors," She stated, looking at the situation before her before turning to leave a moment later. Professors? you thought. That must be why Xaden is back but why didn't he mention anything? Xaden's shadows seemed to disappear and his icy gaze glared at Dain. "This isn't the last time we'll be talking about this," He promised, his voice low. Xaden turned away making his way to the gym doors while Garrick gave you a reassuring squeeze on your shoulder before following his friend. You glanced at Dain who's eyes met yours and suddenly, that indignation came back full force. You spun on your heel and stalked after the two men. "Xaden!" You shouted, garnering brief glances from people nearby. Xaden and Garrick stopped abruptly and you came to a stop in front of them, your arms crossed. "Who the fuck do you think you are!" You asked your older brother and Garrick's eyes went wide. "Excuse me?" Your brother asked, peering down at you. "Why are you acting like a total asshole?" You asked angrily and you could hear Garrick chuckle. "Me?" Xaden asks with disbelief. "This is the first time I see you in months and you berate my boyfriend?" You snapped but you cringed inside. Boyfriend seemed a little...immature but you didn't know what else to say. "Considering what I saw him doing, you're lucky I didn't kill him right there," Xaden replied coolly and you gaped at him. "You could've chosen anyone y/n and you choose Aetos?" He asked, incredulously. "I don't need your approval for anyone I want to date," You spit back. "He isn't good for you," Xaden insisted. "You don't get to make that decision for me Xaden!" You raised your voice. "If you want to act like a big brother and look out for me and care for me, by all means please do so," You continued. "But I'm not a little kid anymore and you have to stop treating me that way. You don't get to decide who I can and cannot spend my time with," You finished. Xaden stared at you while you chastised him.

"So I'm supposed to just be fine with you picking probably the worst guy at Basgiath?" He asked you. "Yes!" You snapped. Your sharp words did nothing to dull the pain from Xaden's words. Could he really think your taste in men, or rather your decision making in general, was so bad? Despite how you were yelling at him, you desperately wanted his approval. "And he's not the worst," You continued. Xaden opened his mouth but you cut him. "You need to get over this Xaden because I'm not planning on breaking it off with Dain anytime soon," Once you were finished, you spun on your heel and stalked off. "We're in the middle of a conversation! Where are you going?" He called after you, ignoring the fact he was supposed to be in a meeting. "To fuck my boyfriend!" You shouted over your shoulder. You weren't actually going to fuck him, but you heard Garrick's laugh as you rounded the corner and the look you imagined on Xaden's face made the retort worth it.

Later that night you sat with the rest of your squad in the dining hall with Ridoc and Sawyer fighting over who was stronger-which led to an arm wrestle-Aaric looking somewhere in between bored and amused, Rhiannon shaking her head in amusement at the two boys' antics, and Sloane laughing as the arm wrestle came to a conclusion. You weren't even sure who won. You had tried to eat, you were certainly hungry enough, but the thought of Xaden and Dain's interaction gnawed heavily on your mind. Xaden had intercepted Dain in the corridor as he made his way to the dining hall with his wing and you were instantly uneasy. Xaden wouldn't actually kill Dain. Right? Violet noticed you were uncharacteristically silent. "You okay?" She asked, nudging your shoulder with hers. "She's just upset because big brother Riorson found out she's been getting it on with her wingleader," Ridoc said smugly. You fixed him with a glare and Rhiannon swatted the back of his head causing Ridoc to laugh out loud. "Seriously?" Violet grimaced at the brown haired man sitting across from her before returning her attention onto you. "He's not technically wrong," You muttered. "Dain and I were practicing sparring after everyone left. It escalated and I sort of ended up....underneath him," You finished. Ridoc and Sawyer tried to keep from laughing. "Xaden walked in as Dain was kissing me,"

You took a drink of your water to try and cool the wave of heat that caused your cheeks to flush. Violet's eyes went wide for a moment. "How did he take that?" She asked, everyone listening in. "About as well as you'd expect," You replied. "I'm surprised either one of them walked away alive." You went on. "Don't forget the shouting match you had with him in the courtyard," Ridoc threw out there. You scowled at him and Violet raised her eyebrows in curiosity to which you told her about your confrontation with Xaden. "So I told him I was going to fuck my boyfriend," You finished, your cheeks on fire. Ridoc and Sawyer collapsed with laughter, Rhiannon and Sloane smiled at you proudly, and Aaric had a slight expression of amusement on his face. "Wow," Violet said. "Yeah it wasn't my best moment," You admitted. "I saw Xaden corner Dain in the hallway and disappear somewhere before we all came to the dining hall," You told them. Violet sensed you were uneasy about your brother's conversation with Dain. "I'm sure everything will be just fine. Xaden and Dain may not always be on the best of terms all the time," Violet started. "But Xaden loves you and we all know how well Dain treats you. I wouldn't let it bother you so much," She finished, giving you a small hug.

You happened to glance up to see Dain appear in the entrance to the dining hall and he motioned with his head to follow him. "I'll be right back," You told your squad. "Good luck," Violet said. You made your way across the hall and rounded the corner of the dining hall entrance to see Dain standing a few feet away. "Well you're alive," You joked, but your tone was laced with a little relief. "How did it actually go?" You asked, worry in your eyes. "Xaden had some strong words and honestly I wasn't sure if I was gonna make it until Tavis vouched for me," He joked and you gave him a pointed stare. "Sorry," he said sheepishly. "So...is he....okay with this?" You asked, the nervousness clawing at you. "Xaden is Xaden. I don't think he's going to ever be too thrilled I'm with his sister but for now...yeah he seems okay with it," Dain nodded, giving you a smile. You felt your shoulders drop in relief. "We’d better head back before people start gossiping,” he said, the familiar twinkle back in his eyes and you nodded. His hand fell to the small of your back but you heard your name being called. You turn around and see your brother staring at you. "I need to talk to you," He said, his expression unreadable. Dain gave your waist a squeeze and left you and Xaden to talk.

You walked over to where your brother stood and crossed your arms, still a little angry with him. "Thanks for not killing him," you said sarcastically. "I thought about it," Xaden muttered. "Listen, I appreciate you wanting to protect me and I don't want you to think I'm not grateful for you. You're my brother; I'm always going to need you, it's just in a different way now. I'm not a little girl any more you don't have to keep protecting me. Dain...he isn't the enemy Xaden. He wouldn't ever hurt me and I trust him," you told him. Xaden ran a hand through his dark hair, sighing. The words stung he couldn't lie; but not in the way he had expected. There was pride in your voice, a sense of confidence and determination he hadn't anticipated.

"I know and I get you're an adult now....but it's hard for me to see my sister with someone who I could never come to terms with," he admitted. That was putting it lightly. You thought. "If he's good enough for me Xaden, why can't he be good enough for you?" You asked him. He could see in your eyes you just wanted him to say he approved of this relationship, of your decisions, and your words hit him like a punch to the gut. "I'm your brother Y/n no one is ever going to be good enough for you," it came out as a joke but deep down you knew he meant it. "Xaden you can't control everything. You need to let me make my own decisions and learn my own lessons," you said, a little frustrated but with a new understanding of where Xaden was coming from. "I can't be your little sister forever," you added quietly. His chest tightened and for a brief moment he saw a younger version of you in his mind.

When he looked at you, he no longer saw the small kid who always needed her brother to be there. You were no longer the kid who looked at him as though he hung the moon. You had grown up. "You're right. You're an adult now, capable of making her own decisions. But I'll always be here for you; that's what older brothers are for," he gave you a smile and you felt yourself grin. "And can you please try to not threaten Dain as much from now on?" You asked him. "He's not as bad as you think." Xaden raised an eyebrow at you. "We'll see." The two of you walked back towards the dining hall and you smiled to yourself. It was a long road ahead before Xaden would, if ever, be comfortable with you and Dain being together but at the moment he tolerated it. And that was enough for now.

Dain Aetos Masterlist

Updated: 3-21-25

*Off Limits ❤️‍🩹💕