Size Kink with Uncle Leo x F!Reader

Uncle Leo is literally such a sweetheart 😩 writing for him felt... very much like writing for Fawkes, but that was the opposite of a problem. I just-- This sweet, sappy stuff is my weakness, I swear 😭

I hope you love it!

Here is the link to my  Kinktober 2023 Event List so you can stay up-to-date, or re-visit these works as you please.

Included: Size Difference, playing with hair, kisses, touching, cunnilingus, oral sex, supermutant sex, large cock, praise, so much sweetness, creampie.

Words: 4.1k

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“Do you remember when we first met?”

The ticklish sensation of his fingers in your hair ceased, momentarily, before they resumed braiding the three separate strands together. 

“How could I ever forget? You were so kind and accepting. I will remember your grace in our first meeting for the rest of my days.” 

A smile gleamed in your expression as you leaned your head back and into your partner’s broad chest. Leo was always so warm. Perhaps it was merely a characteristic of all supermutants– you’d never been close enough to another one to determine if that was the case– but you found yourself choosing to believe otherwise. It wasn’t a characteristic of supermutants, but of Leo himself. 

Your Leo. 

“Darling, I love the feel of you against me, but…” 

“Oh, sorry!” You sat back up quickly, feeling his hands immediately return to their place in your hair, massaging over your scalp before running delicately down the strands and continuing to wind them together. 

“No need to apologize, I’m nearly done.” 

"But your shoulder--"

"It didn't pain me, sweet one." He assured you quickly, "Only fussed your braid a bit"

You hummed at that, nodding thoughtfully until you realized that that too, might fiddle with his delicate practice. His gentle movements lulled you into a sleepy bliss, and your eyes couldn't help but fall shut in response.

“Why did you inquire?” Leo’s voice piped up, deep and gravely, but soft with its proximity to you. 

“Hmm?” Your eyes blinked open again, pulling you from your pleasant lull. 

“A-about our meeting. You asked if I remembered.” He pulled a stray strand away from your face as he spoke, guiding it back to meet with the others that he was ponderously wrapping together. 

“Oh, yeah. I was just… I was thinking about what you told me then. About the moon, and how you said you would give it to me.” 

“Would that I could.” Leo piped up quickly, almost sadly, as though it were something that had been weighing over his shoulders all this time. “If I held it, it would be yours in an instant. You more than deserve the heavens in their entirety.” 

A blush crept to the apples of your cheeks, that same smile overtaking your lips at his sweetness. 

What about what he deserves? You couldn’t help but think. All that he’s been through. The struggle, the loneliness, exile, violence and hatred without clear cause… Leo deserves more than I do. 

If only I had more to give him.

“You’re too good for me.” You said with a slight shake of your head, turning it now to press a kiss to the first bit of him you saw. You felt his breath hitch beneath the skin of his chest as your lips made contact. 

“Impossible.” Leo refuted, as you knew he would, and you kissed him again. This time, you rose a bit higher, closing your eyes as you savored the heat beneath your lips, as you turned your whole body to face him. 

The mattress groaned beneath you in protest, as Leo allowed himself to fall steadily back against the pillows with you overtop him. A breathy laugh escaped the mutant then, as one hand went to steady you over his significant bulk. 

“L-Lone, what has inspired this?” 

“You, Leo.” You said against him, mouth still roaming the broad expanse of his muscular chest. 

He truly was a wonder to behold. So much strength, the capacity for that same ruthless tenacity the rest of his kind seemed to show, and yet… It held no interest for your Leo. 

In fact, it very nearly disgusted him. 

The thought of using his strength for violence instead of helping others, of allowing his emotions to boil over, of letting anger seep out and control his every move, like it seemed to with his brothers... Knowing him as you do, that thought was absurd to even consider.

If only that could be the case for everyone he meets. 

He’d still returned to you, even after humans had fired upon him, beaten him, nearly killed him in their blind hatred for what they clearly just didn’t understand, and yet… 

“The way you still trust me.” You murmured against him, almost in a frenzy now, as your hands smoothed over his skin to wrap carefully about his shoulders, as your lips met his neck and your legs straddled the wideness of his waist. “After all that people have done to you. The way you’re still so kind.” 

His breath picked up, causing your entire body to rise and fall with the rhythm of it as you lay sprawled overtop him.  

“You deserve to be shown that same love.”

You reached his jaw now, dragging your bottom lip over the hardness of it as your warm breath spilled against his face. 

“That same trust and affection that you give to me.” 

Finally, you ended at his mouth, kissing him there, unrushed and unabashed, as you kneaded over his phantom lips. Leo responded in kind, never one to be impolite, as he tilted his head to increase the pressure, allowing your taste to wash over him in full. 

Strong hands wrapped around your body, gentle but firm in the way he kept you anchored to him. His mouth, as with many things, took some getting used to. The largeness of it in comparison, his distinct lack of lips making it difficult for the action to be anything but… mildly lewd, since his tongue was undoubtedly the softest bit of him for you to make contact with. 

Leo was always respectful of you though, he had been from the start... almost frustratingly so. 

He allowed you to lead this time too, to coax his tongue to move against yours as your lips caressed him, as your hands moved upwards to hold his face tenderly. Heavy breaths mixed between you as your nose strained to pull in enough oxygen to sate you, but in the end, you had to back away from the blissful contact. 

“I…” Leo tried, pulling in huge breaths as his body grew all the warmer beneath you, “I would give you anything. Everything I have and all that I am, Lone.” 

“I know.” Your soft voice spilled from between swollen lips, one hand stroking over his cheekbone with profound softness. “I know you would, sweet one, but you don’t have to.”

His brows twitched upwards in surprise at that, but you continued too quickly for the confusion to linger. 

“All I want is you.” 

A slight gasp piled into his lungs, and then your lips were on him again. Your arms clasped with each other around the back of his neck, your closeness threatening to subdue him, but Leo couldn’t seem to pay that fact any less mind. Both of his arms clasped the same such way about your whole body, pressing your chests together until your heartbeats could hear one another, until they could plan to beat in sync. 

The whole of your bodies seemed to agree with that sentiment, you noted subconsciously, as Leo began to squirm restlessly beneath you, as– at that same time– your hips began a subtle grinding motion against his stomach. Long moments passed, and you felt your arousal begin to leak out of you and soak into your underwear. 

It was all so unrushed, so savory in nature, the way your mouths explored one another. Yours continued to wander from the usual place, pressing sweet kisses to his jaw, his cheeks, his throat, delighting in every venture as he sighed out his obvious pleasure. 

“Lone…” Your name escaped him like that of a prayer, spoken only to the most respected, the most revered. 

You could only hum in response, your lips dreadfully busy elsewhere. 

“This night…” You felt his throat contract beneath your lips as he gulped, and that managed to draw your attention away, if only for a moment.

“Yes?” You encouraged. 

“W-what, may I ask, did you have in mind for us?” 

“A night in, Leo. You’re still recovering, after all.” Somber hands drew gentle lines down one shoulder, the one you’d been cautious not to disturb all through today, and all this past week. 

You’d never imagined having to hide from members of your own kind this way… Never understood why they refused to listen, even when Leo was so obviously an ally. 

And more…

Perhaps that’s why those men had fired upon us that evening. Afraid again of what they don’t understand.

As though it were anyone’s business but ours.

They’d been sitting. Just sitting around their shared fire. Lone had leaned her head against his arm in tiredness… and these strangers had gone and nearly shot the other one off. 

To save her. 

Fucking idiots. 

“With your care, I admit, I’m feeling much better.” 

Leo's hand swiped your hair behind one ear, an overwhelming fondness pouring from his touch and expression both. 

“Oh?” 

Your smaller hand grasped to his, keeping it in place so you could press your lips to that too. He was looking at you so intently, but even if he hadn’t been, the mutant undoubtedly would’ve felt your grin through your lips upon him. 

It was rife with mischief. 

“Feeling good enough for…” You purposefully trailed off, allowing him to finish the inquiry within his own mind. It was evident enough that he did as you suspected, what with the way his breath caught and his hand tensed in your grip. 

It was as though the pair of you had never shared a bed, spent a night writhing over the sheets, utterly taken with one another. 

His modesty though did have its perks, for each time with him felt new, felt that anticipatory excitement of the first time all over again. 

“Yes… Though, only if that is what you wish.”

“It’s what I wish.” You said easily, already nodding before he could even finish his sentence. 

A rare sound left him then, one that had your eyes hazy and your stomach clenching– a growl, from deep within his chest. Then Leo was pulling you to him, your legs straddling his chest now as his giant hands pawed over the fabric of your sleep shirt, as he set his mouth over your neck and chest, just the way you had upon him. 

You answered his fervor with a gasp, your hands already moving to pull your garment off over your head in a couple swift movements. Now, you were sure things would move quickly, that his arousal and yours would send the both of you into a frenzy– especially after the couple weeks of playing it safe out in the wastes and taking it easy on his body with the injuries. You ached for him, for this as though it really were the first time all over again. 

Leo had more patience though. 

Instead of setting his mouth upon your chest just as soon as it was bared to him, Leo pulled back, looking on with wide, blown-out eyes as though he were seeing you anew. Any pain from his injuries was completely forgotten, as Leo brushed both hands over the twin swells of your breasts, the pads of his thumbs trailing gently over your nipples in their exploration of you. 

This was the first bit of evidence proving this wasn’t your first time together. His knowledge of what you craved, the confidence in which he reached out, in which he trailed his hands over you… The first time had taken more coaxing, more reassurance, but this… This was a man who knew how to please you, who craved it, beyond all things. 

A moan left you as the pressure of his hands increased ever so slightly, as the roughened pads of his fingers drew tingling circles over your softness. 

“Divine, Lone.” Your partner breathed out, before his hands trailed down your sides, until his fingers were twiddling over the hem of your pants. 

“If I should ask for more… Would you look down on me?” 

“No, Leo. God, no.” 

His hint became apparent to you immediately, and a bolt of anticipation shot up your spine. 

It took some maneuvering, but soon you were fully bare to him, pants and underwear both added to the growing pile of fabric on the floor. 

His breath was so heavy now, it felt like you were on the teetering bow of a ship at sea, your body roiling with the rhythm of the waves. 

“Rest your sweetness upon me, dear one. If you would.” 

Your skin flushed at his request, but you did as his flowery command bid you. With the help of Leo’s supporting grasp, you hauled your hips to hover over his face, before slowly easing down until your core made contact with the warmth of his mouth. 

A groan left him then, vibrating up through the whole of your body until you felt your head automatically fall back in pleasure. His large hands tightened their grip on either of your thighs, his fingers almost able to wrap entirely around them with the pressure. 

“Easy, Leo.” You half-gasped, half-chuckled out, feeling your hips automatically buck from the sensation of his mouth against you, of his hands’ firm grasp. 

Though he didn’t answer with his words– and there was good reason for that– his hands loosened a bit, and he began a slow rhythm of his tongue over the entirety of your folds. Already, you felt your slickness draining out of you with increased vigor, met by your partner’s eager tongue. Your hands went to his to balance yourself, as your hips automatically began to grind down into him, and another sound akin to a growl escaped from his barrel chest. 

“Feels so good.” You urged him onwards– as if he needed any further indication to continue his blissful actions– and Leo’s fervor only grew hotter. The whole of his mouth set upon you, his tongue rolling against your entrance, gathering your growing slickness, while what little was there of his lips sucked over your folds, his teeth careful, but definitely present as they periodically scraped over your most sensitive places. 

His passions had you nearly toppling with the intensity of them, your hands holding more and more firmly to his with every passing moment as you felt yourself pulse and gush out your pleasure against him.

A moan left you, not only at the sensations he was driving into you, but also at that look upon his face as you chanced a glance downwards… He might as well have been drunk, with the way your pleasure so obviously sated him, with the way it left him sodden and giddy and aching for more. Leo’s brows were furrowed, his mouth wide and undulating, pulling everything he could from you, and then some, and with a shout of his name, you were already coming undone. 

His grip held firm as your legs shook, as you writhed in his grasp and huffed out your release overtop him. Leo did not relent though; not fully, as his phantom lips still made impassioned love to your folds.

Finally, your hands were squeezing his with a plea to cease, your whine acting as further support to your wordless request as the last few tremors of ecstasy surged through your body. 

Leo understood though, and soon enough, you found yourself lying flat on the firm mattress as he hovered over your worn body. 

“Alright, my love?” 

A giddy smile invaded your expression before any words could properly form. A nod sufficed, and Leo’s own grin followed not a moment later. 

“Have I told you that you are divine?” 

Another nod, this time with a weak little chuckle attached. 

“Well, then you know how much I mean it…” 

One chaste kiss pressed to your lips, warm and wet and tasting of your sweetness before Leo laid beside you. His fingers trailed up one arm distractedly as he laid on his good side, still facing you. His eyes were brimming with wonder, with affection you’d only ever let yourself dream of growing up. 

And now it’s reality… 

You turned to face him, despite your fatigue, and pulled his face to yours again. Leo hummed through the contact, and your gut gave an eager little roll beneath your skin. 

Not finished yet, it would seem. 

“Lone?” Leo’s soft voice breathed as you pulled away. 

“Yes.” It wasn’t a question. You could see what he intended to ask in his eyes alone, and you’d already made up your mind. 

“Would you like to… continue?” 

“Yes.” You reiterated, this time with another eager nod of your head. 

“If you are fatigued, I understand–”

“Leo.” 

He ceased, merely blinking. 

“I want you, love.” 

Now, it was him who gave you a nod. His jaw was clenched tightly, showcasing the way he was forcing himself to hold back. 

The closest Leo came to his brothers’ unbridled emotions was when he was alone with you. 

His passion shone in his eyes, his want seemingly bleeding from his very skin as he set his hands upon you, and dragged you down until your hips met the foot of the bed. The mattress surged below his weight as he stepped away, only to return to the open space between your legs, where they dangled over the edge of the bed. His body towered over you, well within your eager line of sight as he pulled at the string on his shorts. It almost took effort, then, to pull the waistband outwards and around his straining erection, but when he was free of them, he stepped forward, filling that last space between your bodies. 

“Lone?” He inquired again, his voice husky, but still restrained. 

“Please, Leo,” You begged for him, knowing the way it made his knees shake, that it shot arousal straight to that substantial member straining between his legs. “I need you now.” 

“S-shall I prepare you?” 

Your head shook firmly, as certain as anything. 

“You did." You found your body unwittingly scooching forward for emphasis. "Just want you in me. Now.” 

His body wavered then, like the weight of your words had shoved against him. 

“B-but, love, what if I injure–” 

“You won’t, Leo. Please. I promise, if it hurts I’ll tell you.” 

He still looked a little uncertain, but the way your hips bucked into the air, the way you squirmed and your hands gripped onto the bedsheets in clear preparation had his morals in a chokehold. 

Does he do as you say, or as he thinks you need? 

You could see the war between his temples, but ultimately, one side won out. 

Leo trusted you. He trusted you to know yourself even better than he did, and so, the resolve of his decision was plain, as he guided your hips forward that last little bit, and pressed the searing tip of his cock to your entrance.

You pulled your legs up further on the mattress at the feeling, giving him ample room to press forward, and steadily, he did.

Leo's eyes locked to your expression, to your teeth setting on your bottom lip, your eyebrows creasing together, your forehead dotting with sweat, and as slowly as the mutant dared, he eased the entirety of his cockhead inside. His breaths were leaving him in grunts, yours in whines, as he began to pulse his hips forward in small movements.

It went this way every time. Slowly, carefully, he would press in, after he prepared you, always. Yet... It never seemed to lessen the shock of his largeness. A burning pressure accompanied his growing presence within you, and your hands gripped all the tighter to the bedsheets below.

"So well..." Leo huffed, his eyes almost fully black with his arousal, "Doing so well for me. Every time... You amaze me."

There was no breath for a response, not with the way his hips were drawing back and gently surging forward in equal measure, not as you began to glimpse the evidence of his member's depth through the expanding skin of your belly.

Even with the time you've spent together, the collective hours of this over the months, still, your body had the gall to act surprised at the way it was meant to open for him. You could hardly breathe for the pressure against your lungs, your organs protesting at the way they had to shove aside to let him in, to welcome him, the way your pussy tended to do so easily by comparison.

"Feel you so deep, love." Was all you could manage, and even that was said at the improper octave.

"Would you like me to continue?"

"Mmhm." You ground your hips against him to punctuate your affirmation, driving him in further still.

"V-very well," Leo's breaths left in heavy pants as his pace picked up.

You felt the delicious drag of his textured skin against your sensitive walls, every vein and scar easily detectible with your closeness, with the way you wrapped about him so tightly.

"I want..." A moan left you instead of the intended words, pleasure bursting behind your eyes as the head of his cock hit that soft, special spot deep within.

"Tell me." Leo commanded, his voice rough enough to send chills up your spine.

"Your hands, love. Want you to touch me, please."

A sigh of bliss met the air at your words, and Leo's hips gave an involuntary jolt that made you gasp beneath him.

"Would that I could never cease to do just that."

Your back arched at your partner's sudden fervor, as he hauled you ever closer, as his hipbones met the pliable skin of your ass and his hands delved down your body. His waist pressed to yours, his fingers trailing reverent shapes over your skin, kneading at your breasts, tickling at your throat, until you felt yourself shudder from his touch.

His cock gave an answering pulse within you, and you heard the strain of it catching in your partner's throat.

Just as you were becoming accustomed to the feel of his weight pressing over you, Leo pulled back, somehow maintaining the careful rhythm of his thrusts all throughout, despite the increasing evidence of his impending release.

"Ple--"

Your begging was easily cut short, as one hand smoothed down your body, finding it's destination peeking out from between your folds, straining to reach his touch. He answered the call, pressing two large fingers over your clit and rubbing until stars were bursting all around you, until your walls-- stretched as they were-- clenched even tighter around him.

"Lone... my love, I..."

Leo was already half gone as he tried to warn you, his pace quickening, his resolve failing him as his hesitancy was forced from his mind with the all-consuming bliss threatening to spill over.

"Yes, Leo, please. You deserve this love, you--"

His stuttering pace silenced you, his hips jerking and hands clenching against the mattress and flexing over your clit as his cock swelled, expanding your walls almost to the damn breaking point, before finally, he exploded deep within.

A series of frantic, throaty grunts escaped him in his euphoric climax, instantly spurring your own at the feel of that overwhelming heat filling you to the brim.

Your body trembled beneath his, as Leo delivered the last few thrusts, wringing everything within him, before slowly pulling out. Your breath caught at the way he scraped against your oversensitive walls on the way out, until you felt a great emptiness where he'd been, filled only with the remnants of his spend as it began to leak out of you.

"The most divine creature to exist here..." Leo gently ran his hand over the skin of your stomach, then down to drag over your thigh, before it fell from you completely. "What is bliss, if not you, my dear? What name could it possibly carry, but yours?"

"Leo..." Your voice choked out, half from fatigue and half from emotion.

The bed creaked and dipped as Leo's weight settled beside you, and you felt the comfort of his arm wrap around your body again, pulling you back into the place you felt safest.

His chest poured heat out over your clammy skin as he held you close, and you felt as though you could melt here, in his arms.