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Sam has become accustomed to the change in his chest, which some may refer to as breasts, or as Dean crudely puts it, "tits." For nearly sixteen years, it had been flat. Then one day, it wasn't anymore. The doctor reassured him that this was actually a normal occurrence since he presented as an omega, and his hormones were supposed to change along the way.
Flesh and fat started to fill up the tissue outside his sternum, causing it to become swollen and tender, resembling ripe peaches. While Dean thought it was pretty, Sam found it weird. He preferred Dean's ripped and firm chest, which was more fitting for an alpha. Sam was dismayed to find that his breasts continued to grow bigger and rounder as he turned eighteen. Dean could barely cover them with his hands, his calloused fingers scraping against Sam's delicate skin, always sending shivers down his spine. Luckily, they didn't continue to grow after that, much to Sam's relief, though Dean was disappointed.
Sam has constantly been told that he's lanky and scrawny, from his classmates to some creepy strangers. He's too tall for an omega, and he even has a few inches on Dean. Despite his broad shoulders, muscled arms, and sharp hips, others squint at him surreptitiously, as if they can't believe he's an omega. There's no way those perky breasts belong to an alpha.
Feeling miserable and frustrated, Sam bought a couple of sports bras with smaller cups to compress his swollen flesh, but they were uncomfortable and made him feel like he was being strangled most of the time.
He didn't need to wear the sports bras when he was at home with just Dean, but he still needed to put on some extra layers like a tank top or camisole (which Dean had purchased). Sam's sensitive nipples were the reason he needed to wear soft material to protect them from the coarse texture of his clothes, which made them itchy and hardened immediately, causing nagging pain. However, a camisole alone couldn't prevent his nipples from getting erect and engorged due to the friction, they poked through the layers of clothing all the time.
Dean once blurted out, "Maybe they want my attention," and Sam had to slap the back of Dean's head for making such a comment.
Sam was horrified when he found out that he was lactating that morning. He had been experiencing aching and soreness in his breasts, especially the tips, for a few weeks, so he knew something was wrong with his body. Dean had been growing increasingly frustrated because Sam refused his touch. Sam burst into tears when Dean sucked his sore and puffy nipple too hard, and Dean didn't stop even after Sam asked him to. That time sealed the deal for Dean. But Sam was taking birth control medication regularly after presenting, there was no way he could get pregnant.
The doctor explained to him in a patient tone that he wasn't pregnant and that irregular lactation can happen to omegas, although the reason behind it is still unclear. Sam sighed as he recalled the doctor's words. She had told him that they were not sure how long it would last, and he could choose to take medicine to stop it. However, it would eventually affect his body, with a high possibility of impairing his future pregnancy. Although they had never talked about whether to have children in the future, Sam didn't want to nip the bud when things were still uncertain.
For some absurd reason, Sam was mortified and didn't tell Dean about his lactation symptoms at first. Sad to say, Dean quickly found out because Sam was leaking without his awareness. One night, they were watching a movie on the couch and resting on opposite ends of the sofa in their living room.
"Sammy, your shirt," Dean said, pointing out the two wet spots on Sam's shirt. Sam blushed and felt mostly ashamed. There was an awkward and unbearable silence in the room for a while, and the stretching quietness was felt by both of them.
Dean's emerald golden eyes widened in disbelief as Sam averted eye contact and finally stuttered to explain the new situation to the alpha. Sam's head lowered, and he wrapped his arms defensively around himself to cover those embarrassing spots.
"So here's the thing," Sam paused and took a deep breath to confess, "I started to...um, produce milk. The doctor said it's not unusual, and there's still no remedy for this. Yeah, it's weird. I'm ten levels of a freak now..."
Sam's bangs fell onto his face, and Dean couldn't read his expressions clearly. From his little brother's tensed shoulders and hunched back, Dean knew that Sam was embarrassed and nervous about his reaction.
"Well," Dean finally spoke up, trying to ease the tension in the room.
Dean was unable to conjure up a perfect answer after Sam trailed off his words. Instead, he chose to move closer to Sam, lift his chin, and plant his lips softly on Sam's. Sam let out a whimper when Dean pulled him into an embrace, his arms tightening around Sam's slender waist, and his fingers running through Sam's silky hair, providing comfort. Sam's protesting hands, which had been placed on Dean's chest, lost their strength, and he eventually cupped Dean's strong jaw with one hand to initiate another wet kiss. Although Sam felt a tingling sensation due to Dean's stubble, he did not mind it one bit, and the two continued to deepen the kiss.
Sam had to use extra pads in his bra due to lactation, and he even prepared a few more in his backpack in case they all got soaked. The doctor had recommended that he buy a breast pump, and he eventually caved in, realizing that his breasts were always full of milk. Sam tried to hide this from Dean, spending longer periods in the bathroom in the morning when Dean was still asleep or before he returned home from work. He started to study at home instead of going to the library, thinking it would be easier for him to do the breast pumping. He found himself constantly fussing with the equipment, and white fluid was always everywhere. Sam had to pump his milk shirtless or only in his boxers; otherwise, he would have to do more laundry than usual.
This is how Sam looked when Dean accidentally walked into the unlocked bathroom without knocking that early morning - with his bleary eyes and tousled hair. Dean was too drowsy to function well and not a morning person at all, so he never bothered to wear his slippers when he got up in the morning.
“Mor…” Dean's grumpy utterance disappeared in his throat as he stopped dead a few steps into the door. His mind was still foggy as he dumbly watched the plastic cup drop down to the sink while Sam tried to hide the buzzing electric machine behind his back.
Dean was beyond bewildered as he turned his attention back to Sam. He then noticed that the omega was almost naked, wearing only shorts that hung low on his sharp hipbone. Sam's face was glowing red as Dean's eyes fixated on his bare chest. Sam nervously took a glimpse downwards, only to realize that white droplets were forming on top of his hard, rosy nipple. The strong suction was stimulating Sam's nipple, causing it to drip milk nonstop. The fluid instantly gathered together, forming a small puddle on the floor.
Sam cursed under his breath as Dean strode a few steps right in front of him, standing too close for Sam’s comfort. Sam's entire body trembled when Dean lifted his hand and used his thumb to wipe away the leaking droplets. Though Dean hadn't touched Sam's breast since the situation was unveiled, Sam was thankful for Dean giving him time and space to adjust. But he thought he still needed more time. Right now, Sam had to bite his bottom lip hard to keep from groaning at his brother's deliberate touches. He was even more sensitive than before. Dean's deft fingers fondled and caressed Sam's swollen areola, the pink shade of which was darker than before due to lactation, and his fingertips were wet with Sam’s milk. Sam shook violently under his touches, his breathing shallow and labored.
Without a second thought, Dean dropped his head and latched onto Sam's ignored left nipple. He sucked hard to force the milk out instantly, the faint sweetness dancing on his taste buds.
”Fuck, Dean!”
Sam gasped and cried out a moan, clutching Dean's shoulders to release the sudden intense sensation. Sitting on top of the marble surface next to the sink, Sam wrapped his long legs around Dean's waist out of instinct. His heels dug into the curve of the alpha's lower back as Dean used his flexible tongue to tease, prod, and slurp sloppily around the dripping nipple. Milk gushed out from the oral suction, and extreme pleasure piled up inside Sam, causing him to tremble. His teat was hardwired to his dick, which became hard within a few seconds.
Dean’s hard-on grinding into Sam’s ass vigorously, the heat was radiating through Dean’s sweatpants and Sam’s worn-out shorts. The distinct shape of Dean’s hard cock was portrayed by the cotton wantonly, since Dean didn’t mind wearing his underwear as well.
The milk had a unique taste, reminiscent of his mate’s scent, with a mix of citrus and vanilla flavors. Dean was hooked and couldn't get enough of it, feeling intoxicated and engrossed. As he held the weight of the supple flesh in his right hand, brimming with milk, Sam's perky peak dribbled and poked eagerly at his palm. Dean twisted his fingers, plucking and tugging at the satiny nub, causing Sam to shudder uncontrollably at his daring touches. The omega let out sobs and grunts, stifling his voice while his fingers entangled in Dean's short hair, pulling them roughly enough to make Dean hiss.
The 'pop' sound was loud and lewd as Dean's mouth finally detached from Sam's well-abused nipple, leaving it covered with a mix of Dean's saliva and the juice. The dark pink tip was now glossy and luscious, like sweet, ripe cherries.
"So sweet, Sammy," Dean said, catching Sam's bottom lip with his mouth and parting his lips with his tongue. Sam obediently accepted the kiss, which started out mild and comforting before turning more passionate and lustful. Dean swept in, devouring his omega's entranced taste, and for the first time, Sam tasted his own breastmilk.
Dean's hands wandered over Sam's body, folding his thighs up to his chest and exposing his oozing hole to the alpha. His fingers circled around the tight entrance, adding one with the help of Sam's slick, exploring and stretching the narrow passage. It was so hot and wet, like dipping into melted butter. Dean flipped his gaze to Sam's flushed face, watching as he bit his lips. He pressed the fat crown against the puckered opening, ready to push it all the way in.
“Ready?”
“I,” Sam starts, but hasn’t finished his sentence when Dean shoving his whole shaft all into the bottom, his balls pounding hard to Sam’s bottom cheeks. Sam was almost out of breath for a few seconds, Dean penetrates him so deep that nearly reaching the opening of his womb, his body stretching painfully to accommodate the fullness of the alpha’s cock. It definitely hurts but in such a good way.
"A little punishment for your dishonesty. You don't trust me, Sammy?" Dean asked, not sparing him any time to answer. He pulled out slightly before thrusting back in with the same force, this time even deeper.
Sam was about to answer when the sensation of Dean's thrust interrupted him. "No, I... Ah!" he whimpered instead.
The omega's firm breasts jiggled widely in sync with the intrusion. Sam choked out a cry and instinctively circled his arms tightly around Dean's neck, burying his whimpers into his wide shoulders. He spread his legs wider, allowing more room for the alpha's invasion. The spongy head of Dean's cock constantly ground against Sam's sweet spot, causing his slick to run down profusely from the over-stimulation.
Clinging to Dean with both arms, Sam tightened his hold around the alpha's muscled shoulders, his blunt nails scratching Dean's back with a pleasurable pressure. He hid his pretty face in the crook of Dean's neck, letting out hot and delicious moans that slipped out slowly, dampening the air between them and rhyming with Dean's fierce and demanding thrusts.
Dean's knot started to pop out, the base of his cock swelling up quickly so that he couldn't pull out anymore. The length even elongated due to the extended knot, pressing further into the wet channel and pressing right against the small vent of Sam's womb. As Dean gradually forced the meaty crown into that tight ring little by little, he dragged Sam from his neck to kiss him deeply, sealing both of their loud noises into their crushing lips. Dean pinned Sam down to the cold flat surface beneath him, and the electric increments inside Sam made him arch his back. His entrance was taut because of the expanding knot, and the pain made him feel raw and at home simultaneously.
The alpha's cum spilled into Sam, filling him up, and his uterus absorbed the seminal fluid automatically. It had been so long since he had been bred. Sam reached his first orgasm when Dean suckled his sensitive nipples, and his climax covered his own abs and Dean's flannel shirts. The sound of his heartbeat thundering between them. Dean lay on top of Sam, leisurely nipping at the omega's earlobe as they were locked together by his knot. It would take at least fifteen minutes for it to recede back to its usual stage.
Sam nuzzled his nose into the crook of Dean’s broad shoulder, panting. It turned out that it wasn't as bad as he had thought.
Fin.