[LaDS]Xavier x MC Oneshot
Here is my first oneshot! It features Xavier x MC (Though the MC is named here and has a personalized extended ending, because it's a birthday present for someone but basically it's MC coded)
Pairing: Xavier x Katarina (MC) Fandom: Love and Deepspace (LaDS) Genre: Romance, Fluff, Light Humor, Smut word count: ca. 4k
Tags / Warnings:
💫 NSFW / Explicit (Smut, First Time)
💫 Gentle Dom
💫 Hurt/Comfort (mild)
💫 Established Feelings
💫 Mild Humor / Post-Mission Vibes
💫 Fluff & Intimacy Overload
Another mission, successfully completed. Fighting Wanderers had long stopped feeling like anything special. Sure, this job still came with the very real risk of losing my life if I ever got careless—but that didn’t change the fact that I'd gotten used to it. More than once, I had fate to thank for still being alive. There had been plenty of missions where I underestimated the danger my enemies posed... and barely made it out.
I couldn’t tell the exact time, but the night sky over Linkon was glowing softly—illuminated by a thousand stars and the artificial lights of street lamps and car headlights passing me on the way back to my apartment. Above me, I heard the familiar hum of jet engines—an airship from the Farspace Fleet making its way back to Skyhaven. That meant it was probably around 4:00 a.m. Not an unusual hour for me... but it explained why my eyelids felt like lead and I could hardly keep my focus. In my mind, I could already hear my bed calling to me, soft and warm and fluffy—along with the rest of my plushie army, proudly led by the very first plushie Xavier ever rescued for me from a claw machine: Galaxy Kid. Funnily enough, the plush always reminded me a little of my charming, mysterious neighbor.
By the time I reached the door to my apartment, I let out a long, relieved sigh. My feet were killing me—the night had been a real workout. Who would’ve thought there were Wanderers with the speed and stamina of cheetahs? At least that meant I could skip the workout tomorrow. Or maybe even the whole week, I thought with a tired smile. My fingers dug into my pockets, searching for my keycard—the one I needed to unlock my door.
Strangely enough... it wasn’t where I expected it to be. … Wait a second... I didn’t have it on me? Had I actually forgotten it—or worse, lost it during my fight with that Feralith? (A term I’d made up for humanoid Wanderers with wild animal traits.) You’ve got to be kidding me...
That was my only keycard. Xavier had told me more than once to keep a spare physical key on me just in case. But I always thought that was unnecessary—after all, I always had the keycard. I never forgot it.
Never.
GG, Katarina. I could already picture that smug little smile of Xavier’s and the look that said, Told you so.
What now? I couldn’t just ring up the landlord in the middle of the night, and it’s not like any keycard service was open at this hour. Damn it...
"I knew I heard something."
That soft, calm voice made my heart skip a beat.
I turned around slowly—and there he was, just like I’d secretly hoped. Xavier stood in the dim light of the hallway, his expression mildly concerned, but a warm smile tugging at his lips.
"Just getting back from a mission, Katarina?"
"Yeah, unfortunately. But you should know all about that, Mr. Elite Hunter—when a job runs almost until morning." I shot back, watching as he brought a hand to his mouth to muffle a quiet laugh.
"Fair point. Usually I’m pulling all-nighters. But for you, that’s not exactly business as usual, is it? You’re not hurt, are you?" he asked, stepping closer, his eyes scanning me from head to toe—probably checking for any visible injuries.
I didn’t say anything at first. Of course I was enjoying the closeness and how gently he cared. So when he reached out to inspect me, I raised my arm without resistance. His warm, steady fingers trailed carefully along my upper arm—a spot that often took hits when I shielded myself from enemy attacks. "Everything seems fine," he murmured after a few moments, and I felt a shiver run down my spine as his index finger slowly trailed across my skin. It almost felt like he wanted to touch me longer than necessary... No. I was overthinking again. Right?
"No worries, I’m not hurt. Just completely drained. But unfortunately, I can’t get into my apartment. I think I lost my keycard during the mission… or, knowing me, I probably left it inside in a flurry when Tara called all hyped before we started."
I scratched my cheek, feeling a little embarrassed. I could practically hear the silent I told you so he was serving me in his head—complete with a smile that was far too charming for this hour.
It felt kind of humiliating that he of all people had to see me in such a ridiculous little mess. I was a Hunter, damn it. I fought Wanderers. I saved civilians. And now? I’d locked myself out of my own place.
But instead of laughing, Xavier simply gave me an understanding smile and nodded. “I get it. If you need a place to crash, you’re welcome to stay at mine,” he offered—and my heart rate, already unsteady, kicked up another notch.
"Xavier, that’s really sweet, but I don’t want to cause any trouble," I said with a grateful smile, trying to wave him off.
"It’s no trouble," he cut in firmly, shaking his head. Then he stepped closer, placed a hand on my shoulder, and gently brushed my long dark hair aside as he leaned in. Almost like he was about to kiss me. “You’re always thinking about everyone else... but when do you ever think about yourself? So stop worrying, and let’s get you inside before you pass out right here in the hallway. I’m not sure I’d be able to carry you in my current state,” he added with a playful wink, finally pulling back.
I blinked, caught off guard for a moment. Current state? Maybe he was just as exhausted as I was... or maybe he was teasing me again. Xavier was such an enigma—soft-spoken and polite, yet somehow always knowing the right moment to flirt. It was always a breath of fresh air being around him. And that’s exactly why I loved him.
Wait, what...?
"Are you rooted to the spot?" His amused voice broke through my spiral of thoughts, and I saw him holding out his hand to me. "Planning to sleep here in the hallway? Should I get Miss Hunter a blanket?"
I rolled my eyes in mock annoyance and took his hand, letting him guide me up the stairs to his apartment—conveniently right above mine.
"I think the hallway’s a little too hard for sleeping, but thanks for the offer," I replied, feeling the warmth of his hand wrap around mine. I returned the soft pressure he gave and followed him without letting go.
Once inside his apartment, I went straight for the couch, already thinking of how to make it comfortable enough to sleep on. "What are you doing?" Xavier asked, gently grabbing my hand just as I was rearranging the couch cushions to use one as a pillow.
"Uhm… I was going to lie down…?"
Xavier looked at me silently at first, then let out a quiet sigh. He pulled me away from the couch so I was standing again, then held his other hand up in front of my face, raising both his index and middle fingers.
"Two things," he said softly, then curled his middle finger in, leaving only the index one pointed. "First—you just got back from a mission. You should take a shower before getting any rest."
"Oh—you're right. Especially since I’m just a guest here. Sorry, Xavier, I don’t want to get your couch all dirty," I said with a light laugh, already turning toward the bathroom.
"Second," he said, stopping me mid-step. I turned my head to look at him, just as a wide smile spread across his face. "You're sleeping in my bed. I’ll take the couch," he said firmly.
"What? No way. I’m not letting you sleep on the couch just because I’m the guest," I protested, shaking my head.
Xavier only shook his head again. "I can sleep anywhere, really. It doesn’t bother me at all."
"But—"
Once again, he cut off my objection—but this time, by gently placing his index finger against my lips.
"Katarina… you’re overthinking again. It’s just for one night. Go take your shower, then find something comfy from my closet to sleep in. And tomorrow, I’ll wake you up for breakfast. No more arguing, okay?" he added, and his fingertip slowly traced the shape of my lips. I closed my eyes, letting myself sink into the tenderness of the gesture. His words made my cheeks warm, and I knew there was no use trying to talk him out of it. Xavier could be even more stubborn than I was.
So I gave in, gently taking his hand and lowering it from my face. "You win. We'll do it your way. Thank you, Xavier," I whispered, then placed a soft kiss on the tip of his finger.
This time, it was Xavier’s turn to blush, and I couldn’t help but find him even more adorable than he already was.
While Xavier made himself comfortable on the couch, I headed into his bedroom to pick out a shirt to sleep in. I’d never been in his room before, so I had to figure out where he actually kept his shirts. The most obvious place—the large wardrobe in the corner—only held his Hunter gear and some neatly hung formal outfits for events. Apparently, his everyday clothes were stored elsewhere.
So I started opening drawers one by one, and of course, the first one I pulled open was the one with his boxers.
Blushing furiously and feeling mildly mortified, I slammed the drawer shut, now cursed with vivid mental images of Xavier wearing nothing but those boxers. I shook my head to clear the sinful thoughts and kept searching until I finally found the one with his folded T-shirts. I grabbed the first one I saw and made a beeline for the adjacent bathroom. A cold shower—that should help bring me back to my senses.
It was just one night. And we weren’t even sleeping in the same room.
A fact that—annoyingly—bothered me more than I wanted to admit. -.-.-
I was pulled from my light sleep by the sound of footsteps in the room. Though soft and careful, the wooden floor creaked every now and then, followed by the rustle of something being opened…
Slowly, I blinked away the sleep from my eyes, the room still blurry at first. But as the silhouette standing by the wardrobe came into focus, I instantly recognized Xavier’s fluffy white hair.
Something was different though… He was wearing nothing but a towel slung low around his hips, and a single drop of water trickled down from the tip of his hair, sliding down the muscles of his bare, sculpted back.
I swallowed and quickly shut my eyes again, pretending to still be asleep so he wouldn’t catch me staring.
"Good morning, Miss Hunter." His voice startled me. He knew I was awake?
"Uh… How did—"
"How did I know you were awake?" he interrupted, turning to face me—revealing not just his amused smile, but his impressively toned chest as well. And that towel? It wasn’t doing a particularly great job at hiding anything. There was… not much left to the imagination.
I swallowed again, this time harder, as I caught sight of a small bulge forming beneath the fabric. Quickly, I averted my eyes. Xavier seemed to notice where my gaze had landed and flushed faintly, clearing his throat as if to collect himself.
He approached the bed, placing one knee on the mattress in front of me and leaning over. Instinctively, I shrank back onto the soft pillow, returning his gaze without a word. But my heart was pounding so loudly, I was sure he could hear it. Or at least feel it.
"Your eyes gave you away," he whispered. I blinked and tilted my head slightly.
"M-My eyes?" I asked, brushing my fingers over my face. Then I remembered what Dr. Zayne had once told me about sleep and how to tell if someone was truly unconscious or just pretending.
"Because my eyes moved beneath the lids, right? Real sleep doesn’t do that… the pupils stay still," I murmured back.
Xavier smiled and nodded.
"Someone’s been paying attention in biology," he said softly. "But even without that, it wasn’t hard to tell. The moment I stepped in, your breathing changed. So did your posture. Your body tensed up visibly."
Before I could respond, I suddenly felt his damp hair against my shoulder.
"X-Xavier..? What are you doing?" I asked, my voice a soft whisper. But I didn’t stop him—not when he pressed his nose to my neck and inhaled deeply.
"Recharging my battery… Is that a problem?" he murmured, and the way his lips brushed against my skin sent a shiver skittering down my spine.
"Of course not," I answered with a soft smile, running my hand gently through his damp hair. He nuzzled against my neck like an affectionate cat, and seemed to thoroughly enjoy the way my fingers slipped through the silken strands.
Before I realized it, I felt the mattress shift again—he was now fully on top of me. His legs pinned mine beneath the blanket, and just like that, he’d taken full control of the situation without me even noticing. In the next breath, I found myself pressed back into the bed, and then—his lips were on mine.
He was kissing me.
Xavier, the reserved and enigmatic fighter known as Lumiere, was nearly naked… and kissing me. Was this a dream? No… the kiss felt far too real.
My arms wrapped around his neck as I returned his kiss—the one he had initiated so gently, so cautiously. Xavier seemed to respond to my reaction, because his kiss deepened, grew bolder. A low, yearning sound rumbled in his throat.
He clearly enjoyed it when I slid my fingers through his damp hair, and I soon felt the weight of his body settling more fully onto the bed.
Xavier was now completely on top of me, his legs locking mine beneath the blanket, and without even realizing it, he had taken complete control of the moment. The next thing I knew, I was pressed into the mattress, his lips moving against mine.
He was kissing me.
Xavier—reserved, mysterious Xavier—was nearly naked, sitting atop me, and kissing me like I was the only thing that existed.
Was this a dream?
No, it was far too vivid. Far too intense.
My arms tightened around his neck and I kissed him back, feeling his lips grow more demanding. His body slowly pressed down against mine, the dampness of his skin cool and tantalizing on my own. The towel that had clung to him moments ago… was now gone. I could feel him—all of him—every curve, every heat-filled inch, and my breath caught in my throat.
But just before I could say anything, he suddenly broke the kiss. He hovered above me, his breath heavy, his gaze locking onto mine—and I felt it deep in my chest.
"I love you, Katarina…" he whispered, voice trembling. "May I show you… just how much?"
My heart skipped a beat.
I could hear my own breathing louder than anything else in the room. My skin already burned beneath his touch. And yet… I knew what he said wasn’t just about desire. It wasn’t about lust. It was real. Honest. Him.
I raised my hand to his cheek, brushing my fingertips against his warm, trembling skin. "Yes… please, Xavier. I want this. I want you."
A soft shiver passed through him. He lowered his forehead against mine.
"Thank you... I just—" he exhaled shakily. "I don’t know if I’ll do everything right. I’ve never… not with someone who means this much to me."
I smiled gently, brushing his hair back from his face. "Neither have I. But if it’s going to be anyone… I want it to be you."
He kissed me again—this time slower, reverent. His hands slid down my body, still shaking slightly, as if every inch of skin he discovered was something sacred.
When his fingers slipped under my sleep shirt and brushed against bare skin, a small gasp escaped me.
Had I always been this sensitive? Or was it because it was him?
Carefully, he pulled the shirt up and off of me, watching my face for any sign of hesitation. When I gave him a soft, encouraging look, he smiled—shy and sweet—and let his fingertips trail along my sides, to the clasp of my bra.
He paused.
I reached for his hand, guided it there, and whispered, "It’s okay. Don’t be shy."
He understood.
With a quiet snap, the clasp gave way, and he slowly removed the last layer covering my chest. His breath caught when his eyes fell on my bare skin.
"You’re beautiful…" he murmured, voice husky. I blushed at the intensity of his gaze.
Then he leaned down, and I shivered as his lips brushed over one of my nipples—tentative and soft. His tongue circled it, tasting, learning, while his hand gently explored the curve of my other breast. The way he touched me was still slightly unsure, but so, so tender. I buried my fingers in his damp hair and arched into him with a quiet moan.
Xavier lifted his head, eyes wide with concern. “Did I hurt you?”
“No… it’s just… you feel so good.”
His lips curled into a soft smile, but there was something new behind his gaze now—something darker, warmer, hungrier. His hand slid lower, tracing the line of my stomach until it reached the waistband of my shorts. He glanced at me, silently asking for permission. I nodded and raised my hips slightly, allowing him to pull them down.
My underwear soon followed, and I was left completely bare beneath him. Xavier paused, eyes wandering over me as if I were a constellation he had studied for years, memorizing every star, every curve.
Then, with trembling fingers, he touched me between my legs—cautiously, gently—until he found the wetness waiting for him. He began to draw slow circles, and I gasped, my body twitching at his touch.
“So sensitive…” he whispered, more to himself than to me. “Does it hurt?”
“No… please… don’t stop.”
He silenced my reply with another kiss, deep and distracting, while one of his fingers slowly slid into my warmth. I tensed, unfamiliar with the sensation, but his other hand came to my cheek, soothing me with a gentle caress.
“I’m here… I’ll go slow. I promise.”
And he did.
Patient and careful, he moved his finger within me, letting my body grow accustomed to the feeling. Before long, I felt myself opening to him, my breath quickening as desire overran any lingering discomfort. When he added a second finger, I moaned his name directly into his mouth.
He pulled back just enough to look down at me, panting, his eyes wide and full of longing.
“I don’t think I can wait much longer… Katarina, I… I want to feel all of you.”
I nodded, placing my hands on his waist. “Then take me, Xavier. Show me how much you love me.”
He reached for something in the nightstand—a small foil packet. “Jeremy told me to always keep one in here,” he mumbled, a bit dazed. “I told him he was insane. I think… he knew something I didn’t.”
I laughed breathlessly, and he smiled as he rolled the condom on and leaned over me once more. With the tip of his length, he brushed against my entrance, teasing slowly, carefully, before pushing in just a little.
I gasped and held onto his shoulders. He froze.
“Should I stop?”
“No… please. Just go slow.”
And he did.
Bit by bit, he slid deeper inside me, every inch bringing with it new sensations—tight, unfamiliar, intense. But not painful. It was Xavier. It was him.
“You’re so warm… so tight…” he groaned, voice hoarse. I felt him tremble. “I just want to make you feel good… I just want to make you happy.”
I kissed him, pulling him closer. “You already are.”
He began to move, slow and steady, and I felt my body adjust to him, craving every movement. The pleasure crept up slowly at first, like a fire being gently stoked—then growing stronger with every thrust. I couldn’t hold back the sounds spilling from my lips anymore, and his moans of my name joined mine, raw and breathless.
“Katarina… I love you… I don’t think I can last much longer…”
“Then don’t… come with me… Let’s fall together…”
His lips crashed onto mine—desperate, deep, hungry—while his rhythm quickened. My legs locked around his waist, and my nails dragged down his back as I spiraled closer to the edge.
And then—we fell.
I clenched tightly around him as the orgasm hit, my body arching into his. He buried himself deep, letting out a broken moan as he released, trembling within me.
For a long moment, neither of us moved. We lay there, breathless, slick with sweat, clinging to each other as the aftershocks rippled through us. Finally, he let himself collapse fully onto me, his head resting on my shoulder.
“I love you… I love you so much…” he whispered against my skin.
I ran my fingers gently through his hair, smiling with a joy I couldn’t put into words. “I love you too… Forever.”
We fell asleep like that—naked, exhausted, tangled in each other’s arms. And yet, in every sense of the word… complete.
Extended Ending:
Warm sunlight filtered in through the window, painting golden stripes across the sheets. I blinked slowly awake, blinking against the light and feeling something soft curled around my back. Or rather—someone. Xavier had an arm loosely draped over my waist, his breath steady and warm against the back of my neck. His skin was warm, his presence grounding. I smiled sleepily.
Turning gently to face him, I found that he was already awake—his hair adorably tousled, his eyes half-lidded and drowsy, his face carrying that quiet, contented look I’d started to adore.
“Good morning, Miss Hunter,” he murmured.
“Good morning, Lumière,” I whispered back with a grin.
We stayed like that for a little while, tangled in warmth and silence. Eventually, I got up to make coffee, slipping on one of his oversized shirts. But when I returned, he was no longer in bed.
I found him in the living room, sitting casually on the couch, slightly hunched over... holding one of my sketchbooks.
I froze. “Xavier. Please tell me you didn’t—”
“I saw everything,” he said with that perfectly calm, composed tone that, coming from him, was honestly more terrifying than yelling.
Oh no.
I rushed over, but he raised the book, just out of reach, and flipped to a particular page. A drawing of Childe and Lumine, mid-kiss—except... it wasn’t Childe.
It was him.
His face. His hair. His sharp, elegant profile drawn in tender pencil strokes beside a blushing Lumine. My Lumine.
I turned beet red.
“That was just—uh, a practice sketch! For anatomy! Purely artistic!”
He smiled. He smiled. “I didn’t realize I was so… creatively versatile. And with a Genshin heroine, no less?”
“Oh my god—give it back!”
I lunged for it, but he simply held it higher. “Katarina,” he said in mock seriousness, “why did you never tell me I was your perfect Genshin boyfriend? I feel… betrayed.”
“I was tired, okay?! I just wanted to draw something sweet! And you... kind of have Childe vibes… sometimes.”
He laughed under his breath. “I’ll take that as a compliment.” Then he gently closed the sketchbook, handed it back to me—and leaned in to kiss my forehead.
“But if you ever need a model for your next couple fanart piece,” he added, voice low and teasing, “I can pose.”
I threw a pillow at him.