By Zephyria 
The fingers that entered without hesitation pressed firmly against the soft inner walls, rummaging through the inside. Kim Si-baek opened his mouth wide as if to say something, but immediately clamped it shut and buried his face in Tae-un’s shoulder. He tried not to moan, but every time he felt the fingers wriggling inside his belly, a small, fragmented “hngh” escaped through the gaps of his teeth.
“Does it hurt?”
“It’s not that it hurts… I’m just saying the feeling is really strange.”
“Aw, you’ve had a bigger, thicker cock inside you before.”
“That doesn’t move by bending or spreading like fingers do…”
For some reason, the fingers rummaging inside his hole stopped abruptly at those words. Tae-un asked back in a low, sunken voice.
“…Do you like it when a cock moves like fingers do? I mean, due to my physical structure, it’s impossible to do exactly what fingers do, but I’ll try my best to rotate it well…”
“No. You don’t have to try anything.”
Fearing how he might spiral if he tried any harder, Kim Si-baek quickly cut him off.
“You have gel, right? I’ll just do it myself.”
“Oh, so you mean you’re going to poke your own hole with your fingers to widen it?”
“….”
Was it really necessary to describe it in such specific detail? Kim Si-baek silently pushed his hand away. Tae-un, sliding out from between his buttocks, flicked his slightly wet fingers before pulling gel and condoms out of the nightstand drawer. He felt a sudden wave of dread imagining what Lee Han-gyeol must have been thinking while sending gel and condoms from Daejeon to North Korea.
Instead of stepping back to wait for him to prepare after handing over the gel, Tae-un instead spread Kim Si-baek’s thighs further. Above his startled head, a nonchalant voice drifted down.
“Can’t you show me while you poke and widen your hole?”
“Do you think I can? Why have you become such a pervert…”
“In exchange, my cock got bigger.”
“….”
“Which do you prefer: a cute Un who has a big cock and is a pervert, or a cute Un-i who has a small cock and isn’t a pervert?”
The answer came instantly, without a second thought.
“The small, non-perverted you.”
“….”
Tae-un flinched and obediently closed his eyes.
“…I won’t look.”
Though he had quieted down, Kim Si-baek feared he might be peeking through slit eyes, so he pulled Tae-un into an embrace. Tae-un, now with his face buried in Kim Si-baek’s shoulder, let out a whimper and rubbed his forehead.
Swallowing his breath, Kim Si-baek opened the gel and squeezed it between his thighs. Feeling the cold, slimy sensation instantly wet his thighs, he slowly moved his finger.
Though slimmer than Tae-un’s, his firm, well-trained fingers pushed into his body. As expected, it was a strange feeling. At the same time, a subtle sense of regret washed over him. He wondered if it would have been better to let Tae-un do it, since he enjoyed it so much, if anyone poking him felt strange.
The strange sensation, which was hard to describe, turned into a distinct feeling of foreignness as he pushed in another finger, gradually widening the inside. It felt as if heat was catching on the lower part of his navel, and the inner walls clinging to his fingers felt ticklish.
He felt that if he went any further, a stranger—no, the raw pleasure he had felt during his relationship with Tae-un—would suddenly burst forth. As the dizzying sensation that felt like it was searing his body returned, he paused his fingers. Tae-un, who had been obediently burying his face, began to graze his teeth gently against his shoulder as if pleading.
“Why did you stop, Hyung? Aren’t you going to keep poking?”
“How did you know?”
“Mmm. Because every time you move your fingers, the gel sticks to your skin and makes a squelching, wet sound…”
“….”
Whether it was showing him visually or letting him hear it auditorily, the result was the same. Feeling his earlobes turn red, Kim Si-baek moved his fingers a bit more. He hadn’t been particularly aware of it until now, but perhaps because of Tae-un’s words, the squelching sound drenched his ears with an erotic resonance.
The erotic resonance didn’t stop at auditory stimulation. Thinking that Tae-un was listening intently to the sounds coming from his body, his nerves suddenly focused on the foreignness he had previously only found strange.
It was his own fingers rummaging inside, but his sensitized senses overlapped that night upon the sensation. The moment that genitals—far thicker and bulkier than these fingers—had pushed in without hesitation.
“Hngh…”
Before he knew it, his fingers had gone deeper than originally intended, scraping the inside just as Tae-un had that night. Before Kim Si-baek, who flinched at the accidental moan, could bite his lip to swallow it, the back of his head was grabbed. Dark eyes stared at him as if to devour him, and a low, husky voice licked his ear. It was a resonance far more erotic than the squelching from before.
“Hyung. I don’t think I can hold back. Is it okay if I do this?”
Feeling the thigh pressed against him, erect and as hot as the voice, Kim Si-baek unconsciously swallowed hard. No sooner had he nodded barely perceptibly than their lips overlapped, and his field of vision flipped abruptly. The mattress, bearing the weight, creaked loudly.
“Hngh, agh!”
The thick glans pushed in, forcing open the narrow entrance. He had spread his thighs as wide as possible, to the point where his muscles felt taut, but it wasn’t enough. Kim Si-baek arched his neck, trembling with moans. Still, perhaps because he had applied plenty of gel, it was less stiff than their first time. Though that might just be a feeling.
“I feel like I’m going to be bitten off.”
Tae-un whispered, looking down with eyes entwined in deep arousal. The slight furrow in his brow indicated that pain was also rising for him, but his gaze clung stickily, as if the pain only added to the pleasure.
“Since we’ll become one until the day we die, I think that wouldn’t be so bad either.”
He suddenly said something chilling. It seemed that because the insertion was so tight, the boy’s imagination was running wild in a strange direction.
“Wait, whew. Just wait a second.”
Kim Si-baek gasped for air and pushed Tae-un away. Tae-un was pushed back obediently and lay on his side. The bed, too narrow for two healthy adults to tangle in, creaked.
The genitals, standing erect and glistening, bobbed between Kim Si-baek’s legs. He swallowed involuntarily. When he received him from below, he had never properly perceived it with his eyes, but looking down from above, it was larger and thicker than the sensation he felt in his body.
Just as Tae-un said, he slowly stroked the shaft with his palm, a size that would remain even if gripped with two hands. He felt a subtle regret that a gel-slicked, glistening condom was covering it. If not, he would have felt the explicit sensation of protruding veins pressing against his palm.
For some reason, the roof of his mouth felt dry. Kim Si-baek unconsciously licked his lower lip and lowered his hips.
“Mmm…”
As the hole, with gel leaking from the inside, wrapped around the glans as if pressing it, Tae-un let out a low moan and gripped Kim Si-baek’s thighs. The longer he hesitated, the harder it would only become. Kim Si-baek sat down, bracing himself with his other hand on Tae-un’s chest.
“Hah! Ngh, hngh!”
With the added weight pressing down from above, the thick genitals pushed and forced their way through the narrow inner walls. Even so, only a part of it must have been inserted, yet a sudden surge of pressure felt like it was piercing his chest.
At the same time, he felt a sense of longing. This wasn’t enough. He wanted to swallow it deeper, so that this pressure would completely crush him.
Tae-un moved his hand to Kim Si-baek’s buttocks, which were struggling because the insertion wasn’t complete.
“Can I move?”
“Hngh… You don’t… have to ask.”
As soon as permission was granted, Tae-un grabbed his buttocks and pulled down hard. His waist arched back at the heat that slammed into the deep interior that the gel hadn’t reached. Holding onto the swaying man, Tae-un thrust his hips upward.
The moan that was about to burst from his lips was swallowed by the rhythm striking from below, flowing out in gasps as something high-pitched that was neither a moan nor a scream. The pleasure that had started unfamiliarity was now rapidly devouring him.
A voice that didn’t feel like his own kept surging up from his throat.
“Hngh! Hah, ngh!”
Kim Si-baek managed to bite his lip, but it was of little use. As soon as he was struck hard from below, his lips opened helplessly, and scream-like moans poured out. Even though it was his own body, he couldn’t control it at all.
Whenever a short, piercing pain shot through him, a dense pleasure followed, as if layering over it. Kim Si-baek couldn’t easily distinguish whether the moans coming from his mouth were due to pain or pleasure. Either was fine, and both would be even better.
“Haa, Hyung. It’s really so narrow… Am I really going to be bitten off? Then you’d be in the most trouble.”
“I told you… ah, stop saying things like that, ngh…”
“It’s tightening more.”
Tae-un chuckled softly in his throat, gripping the buttocks so hard that red handprints would form, and struck his hips even harder. At the pressure that felt like it was being driven up to his solar plexus, Kim Si-baek twisted his waist and raised his moans. My god. Just how far in had it gone?
“Hngh, agh!”
Even though he could see his lower abdomen bulging and wriggling from the genitals repeatedly thrusting inside, he couldn’t believe it. His own erect member was also shaking in front of his lower belly. He became acutely aware of the splashing sound of fluids echoing inside. The genitals roughly reciprocating, shaking the narrow hole he had opened himself with plenty of gel, and his own inner flesh clinging tightly to it.