By Zephyria 
His genitals had already begun to erect to the point where his clothes felt somewhat stifling. As Tae-un blatantly grabbed and pressed down on them, the stimulation was transmitted directly. As if enjoying the trembling of Kim Si-baek’s thighs, Tae-un rubbed the prominent outline of the cock with his entire palm.
Tae-un no longer wore gloves in front of him. The sensation of the calluses etched into his palms and fingers was vivid even through the fabric, causing Kim Si-baek to stifle a moan. He felt once again just how much those hands had grown.
A thick, low bass softly brushed against his ear.
“It would be a waste to end it like this, wouldn’t it, Hyung? I’ll make it quick, okay?”
With a voice laced with aegyo, he pleaded while planting kissing sounds across his earlobe and cheek, leaving him with no choice.
“Don’t move your hand to any strange places. Got it?”
“Strange places? Where? Hyung, mmmph—”
Kim Si-baek grabbed Tae-un’s cheek and pulled it tight, muffling his words, but Tae-un seemed to welcome it, kissing his wrist instead. He set his teeth against the blue veins protruding from the white skin and licked them gently with the tip of his tongue. Realizing that his pulse, throbbing as fast as his quickened breath, would be transmitted to the other man, he felt his blood flow even more violently.
Was this a lust similar to his? He didn’t know yet. But it was certain that in no past relationship had his heart raced like this from just kissing and light petting.
Tae-un’s hand crawled slowly up from his thigh to his abdomen, pulling down his pants and underwear all at once. He felt awkward that his cock sprang out as if it had been waiting for this moment, and he felt quite embarrassed to expose his private parts so starkly to the younger brother he had raised. After all, this was a completely different situation from when they went to the public bath together as children.
Rubbing his face, which was flushed for various reasons, Kim Si-baek felt a sense of foreboding when he saw Tae-un’s gaze fixed on one spot after pulling down the underwear.
“Um, Un-ah?”
“Yes…”
He called out cautiously, but only a soulless answer drifted back. The gaze remained fixed on his semi-erect cock. He wouldn’t have minded if he had just touched it, but the fact that he was just staring blankly without doing anything made the embarrassment surge.
Just as Kim Si-baek was about to pull his underwear back up, he gasped. Tae-un’s face was gradually leaning down. Specifically, toward his crotch.
“No, don’t. Not that.”
He hurriedly grabbed Tae-un’s face to block the attempt at a blowjob just as he was about to take the penis into his mouth without hesitation, but lingering desire dripped from the younger man’s eyes.
“Just one bite, Hyung. Really, just one bite.”
“What do you mean, one bite? Is this something you eat?”
“But it looks so delicious.”
It was the first time in his life he had ever heard that his genitals looked delicious; his mouth hung open in shock before the shame could even set in. This felt very much like sexual harassment. Does sexual harassment still apply when you’re tangled together on a bed?
While his confused mind briefly escaped into denial, Tae-un continued to chatter anxiously.
“I bathed with you when I was little, but honestly, that was so long ago that I didn’t remember exactly what it looked like. But seeing it again, it’s really…”
Tae-un let out an ecstatic exclamation as he wrapped his palm around the shaft. His waist jerked at the sensation, which was far more vivid than what he had felt through the fabric.
“The color is pale, just like your skin, it’s so pretty. The shaft is straight and not curved, just like your personality. And the scrotum isn’t too saggy and is nice and round, just like your…”
Unable to bear the nonsense of comparing his genitals to his actual person, Kim Si-baek forcefully pulled Tae-un’s face back up. Then, he chose the best method to stop the nonsense.
As he blocked Tae-un’s lips with his own, Tae-un swallowed his disappointment and obediently mingled their tongues. As much as his tongue played—biting the tip and sucking—the hand gripping him below moved urgently. He rubbed the pre-cum beginning to bead on the glans with his thumb and stroked the shaft.
With the direct stimulation, blood rushed downward with terrifying speed, causing it to swell achingly. The wet, sliding motion of the hand heated the skin to a flush. His waist moved unconsciously, rubbing his cock against the palm. Tae-un chuckled softly, shaking his hand up and down rapidly.
“I love how fast you react. I wouldn’t mind even if you were premature, Hyung.”
“…Haa, it’s just because it’s been a long time.”
Offering an excuse that wasn’t really an excuse, Kim Si-baek glanced down. He thought Tae-un’s voice sounded quite excited, and indeed, the area below him was heavily swollen. That meant he had become even more erect while touching Kim Si-baek’s.
He unconsciously licked his dry lips. Kim Si-baek slid his hand down and grabbed the thick bulge through the clothes.
“Hngh.”
Even with just that, Tae-un’s shoulders trembled as he let out a thick groan. It was a real groan created by him, different from when Tae-un had used the excuse of erogenous zones in the past. It was the sound of an adult man, not a child. It was unfamiliar, yet he didn’t dislike how it sounded in his ear.
Kim Si-baek somewhat hastily undid the buckle of the pants and lowered the zipper. The stifled cock was finally liberated.
〈Anyway, not only are my hands big, but my sperm ejection organ has grown a lot too, so even if Hyung holds it with both hands, there’ll be some left over.〉
…At the time, he had wondered why the kid was saying such strange things, but he never imagined a future where he would actually touch it with his hands. Kim Si-baek felt a slight sense of relief that the room wasn’t bright enough to see the size clearly as he gripped it. A weight more distinct than what he had felt on the morning the bed was smashed pressed firmly against his hand.
Groaning and leaning his waist deep, Tae-un exhaled short breaths into his ear.
“Just from you touching me, I feel like my cock is going to explode…”
“I told you not to use slang…”
“It’s okay if it explodes, so do it harder, ngh.”
Even if Tae-un hadn’t pleaded, he would have applied more strength. His palm felt scorching, constantly stimulated by the heat of the foreskin where thick veins bulged. As if possessed, his hand moved breathlessly, and conversely, the cock held in Tae-un’s hand swelled as if the heat had transferred.
Was this situation—giving each other handjobs while holding their respective genitals—really reality, something he had never imagined? As his overheated consciousness floated hazily in pleasure, a vivid sensation of pleasure surged from below as if in response.
“Ah, hng, nng…”
The pre-cum flowing from both their glans was swept away by the rough touch, dripping and flowing onto Kim Si-baek’s abdomen and chest. Kim Si-baek stared, as if entranced, at Tae-un’s lips within breathing distance and the red tongue hidden between them. That redness was so orderly yet erotic, contrasting with the messy hand movements below and the rough breathing.
Just as the corners of Tae-un’s mouth seemed to curl up, he looked down and bit hard into his own neck; at that moment, Kim Si-baek’s waist trembled as he ejaculated. He felt the hot semen spurting out in gulps within his hand.
“Huu…”
With a thick, spreading groan, Tae-un’s weight leaned onto his body. Thinking that if he hadn’t trained himself, he would have struggled to breathe under this weight, Kim Si-baek panted.
His mind was simply blank.
Even if it wasn’t sex, they had done something similar to sex, so he wondered if something would feel different now.
Yet, the sensation of the boy rubbing his sweat-soaked forehead against his cheek while catching his breath was still pleasant. Kim Si-baek was still Kim Si-baek, and Tae-un was still Tae-un. His eternal child.
While floating hazily in the afterglow of pleasure and letting his thoughts drift, he finally remembered that his clothes must be completely messy. Just as he was looking for a tissue to wipe his hands before washing, Tae-un grabbed his wrist.
“Un-ah?”
Tae-un stuck out his tongue and licked his fingers. The red flesh of the tongue drew in the viscous, whitish fluid that had soiled his fingers. The sensation of the bumpy papillae sweeping away the semen that had flowed between his fingers and pooled in his palm was stark.
The flickering tongue didn’t just lick the semen, but also nibbled on the twitching fingers. In the bedroom where the heat had not yet subsided, the wet sound of sucking and licking fingers echoed, and the thick, overflowing afterglow of pleasure relentlessly stimulated the already sensitive nerve endings.
Feeling as though he might erect again so soon after ejaculating, Kim Si-baek hurriedly pulled his hand away.
“Why do you like sucking my hands so much? Do you have a fetish?”
“What I really want to suck is Hyung’s cock, though.”
“….”
“Like, a Hyung’s cock fetish?”
As a penalty for blabbing slang again, Tae-un received a slap on the forearm, but he curved his eyes happily.
“You know, Hyung. Do you know what triggered me to first recognize you when I was five?”