The tightness of a pussy that had never allowed anyone to enter it.
The virgin pussy of my innocent childhood friend, who had been secretly in love with me for so long.
Subin gave a small gasp at the unfamiliar sensation and faint pain of her first experience, but her face showed a happiness that outweighed the pain.
The ecstasy of becoming one with the man she loved.
For Subin's sake, I began moving my hips very slowly and carefully.
-Squelch… squelch…
I could hear my cock gently parting the vaginal walls slick with her arousal.
They said HSDD meant an extremely low sex drive, but when we actually had sex, she wasn't producing much less lubrication than other women.
Was the power of love really this incredible?
A warm atmosphere filled the room, one in which silence was not awkward at all.
Just looking into each other's eyes made our hearts pound as though they would burst.
Love seemed to drip from Subin's emerald eyes so clearly that I could almost feel it.
“Are you okay? Does it hurt a lot?”
“No… I'm okay… It feels good….”
I couldn't tell whether she meant my cock felt good or that she liked me. Probably both.
Every time I moved my hips, Subin let out a small moan.
She looked so adorable that I gently licked the sweat beading on her forehead with my lips. Then I kissed her deeply once more.
We gently held only each other's lips, without intertwining our tongues.
When I drew her lips into mine with a soft smack, I caught a sweet, fruity scent from Subin's saliva.
My hands weren't idle either.
As before, I gently gripped Subin's large breasts. I tenderly caressed the breasts filling my hands.
“Hngh… Sihyeok….”
As I slowly kneaded them lewdly, I felt her nipples harden and roll beneath my palm.
At that sensation, Subin's pussy twitched and clenched around my cock.
“Does it feel good here too?”
I asked while gently rolling her nipple with my fingers.
“Yeah… I like it. But it feels strange… When you touch my breasts… my lower belly tingles….”
Her honest reaction made me laugh.
Feeling playful, I lightly pinched her other nipple between my thumb and forefinger.
“Hyaah…!”
A cute cry of pleasure burst from her. Her pussy squeezed my cock tightly.
The tremendous stimulation made me stop moving my hips involuntarily. Her vaginal walls spasmed, trapping my cock so it couldn't move an inch.
“I-I’ve never felt anything through my breasts before.”
“Impressive. You feel it through your nipples?”
“Maybe it’s because you’re touching me, Sihyeok… Hehe….”
Subin looked up at me with pleasure-dazed eyes and smiled faintly.
I smiled with satisfaction and began moving my hips again.
The initial tightness of her pussy had almost disappeared. Now it was pouring out slick fluid in time with my cock's movements.
-Slap, squelch, squelch…
I had sex with her slowly and devotedly for long enough that other women would have climaxed twice.
Then I gradually increased the pace of my thrusts.
The innocent atmosphere had become filled with lewd desire before I knew it.
Subin's moans also began escaping more and more freely, without any sign that she was trying to hold them back.
“Ah, ah… Aang! Sihyeok! There, something feels strange…!”
There was one spot to which Subin reacted especially intensely. Her G-spot.
I persistently targeted it, pressing it firmly again and again with my glans. Subin twitched as her delicate body took in the intense pleasure.
“I-I think I'm going to come…! It's my first time feeling anything like this…! Ugh, hnnngh…!”
It was at that moment.
-Click!
I heard the digital lock on the front door disengage. A moment later, I faintly heard the door open and close.
It seemed Chaerin had returned from the academy.
The instant Subin realized it, her body twitched and stiffened.
I could feel her dismay clearly in the vaginal walls clamping tightly around my cock.
“C-Chaerin’s here…! Wait, stop for a moment…!”
Subin tried to push me away in panic, but there was almost no strength in her hands. Instead, I could feel that, deep down, she wanted to take me even deeper.
I didn't want to stop either. If anything, the situation excited me to the point of madness. Besides, stopping halfway through thrusting was out of the question.
“It's okay.”
I whispered into Subin's ear.
“Ignore her.”
Then I kept moving my hips without stopping.
-Squelch, squelch, squelch!
“W-Wait…! What if she finds out…!”
Perhaps she was embarrassed that her friend Chaerin was right outside the door, because she clenched her pussy even more tightly.
I brushed aside that adorable resistance and pounded into her, driving deep inside her pussy.
“Hngh…! Nngh…!”
Subin bit her lip to hold back her moans. But the harder she tried to suppress them, the more sensitive her body became.
I loved seeing her like that, but I also wanted to see her lose all reason and cry out.
The urge to come began building. Perhaps Subin noticed the change in me, because she tried desperately to stop me somehow.
“Sihyeok, you can't come now…! Chaerin will be sad if she finds out…!”
“Don’t hide yourself, Subin. Be proud.”
I whispered into her ear once more.
“You’ve lived your whole life hiding yourself like that.”
Subin had hidden her HSDD so her friends wouldn't treat her like a weirdo.
“But you don't need to hide anything from me. If you want to cry, cry; if you want to scream, scream. Show me everything you are.”
“Ah…!”
It was an odd thing to say in the middle of sex, but I meant it sincerely.
It was what I wanted to tell Subin, who had spent all this time enduring, enduring, and enduring some more.
Her painful past and the vulnerable personality it had created. She inspired such a strong protective instinct in me that simply watching her was enough.
My heartfelt words made Subin's eyes tremble violently.
Then, at last, after briefly glancing toward the door, she let go of all restraint.
“Ah, hwaaahng…! Sihyeok! I like you! I love you…!”
Overcome by immense emotion as well as orgasm, Subin finally climaxed without holding back her moans.
As she climaxed, she cried out that she loved me again and again.
Perhaps she was even shouting so Chaerin outside the door would hear.
Subin's pussy spasmed and clenched my cock again. Overwhelmed by that incredible pleasure, I could hold back no longer and poured hot semen into her vagina.
-Brrrrrrt…!
Subin, panting from her climax, murmured softly at the hot sensation flooding into her pussy.
“Haa, haa, so this is… semen….”
She lightly touched her lower abdomen with an expression mingling joy and wonder.
I knew, realistically, that it probably hadn't even reached her uterus yet, but I didn't bother saying it aloud.
After climaxing once, Subin reached out, pulled my face toward hers, and kissed me.
“I love you♡”
“Me too.”
-Thud!
Just then, I heard something fall outside the door.
I figured Chaerin had heard everything, but there was no point worrying about it now.
Rather, while kissing, I began moving my hips even more enthusiastically.
Her pussy had grown accustomed to my cock, which now slid in much more smoothly and deeply than before.
“Haaang…! Smooch, smack…!”
Subin moaned louder and responded to my kiss. We explored each other's lips and moved our hips like mad.
We had sex in the missionary position for a long while, then changed positions and enjoyed the cowgirl position as well.
But perhaps because it was her first time in cowgirl, Subin could barely move a few times before running out of stamina.
After having sex for a long time, I opened the door to the room, but no one was in the hallway. It seemed Chaerin had already gone home.
* * *
Outside Subin's room, the silicone dildo in my hand dropped limply to the floor.
But I didn't even think of picking it up. All my attention was focused on what lay beyond the firmly closed door.
It was Subin's voice—not her normally shy voice, but the cries of a female completely steeped in pleasure and stripped of reason. Mixed with that voice was the wet sound of—
Squelch! Squelch!
The sound of a cock pounding into her.
My mind went blank. It felt as though my heart had plummeted to the floor. My fingertips went cold.
No. It couldn't be. I must have heard wrong.
But even when I covered my ears, the sound rang out more clearly inside my brain.
The two of them were having sex right now, with only a door between them.
The instant I realized that, my breath caught. I staggered backward.
Then I spotted the front door and ran outside like a madman. I didn't look back.
I don't remember how I got home. My vision was blurred with tears, and I could barely see.
I was simply in tremendous pain. It felt as though someone were scraping my heart raw with sharp shards of glass.
As soon as I arrived home, I collapsed onto the mattress without turning on the lights. Then I began sobbing aloud like a child.
“Waaaaah… sob, hic….”
I was furious. I was miserable. And more than anything, I was terrified.
It used to be forbidden, but these days even siblings could marry in this world. I began to wonder if Sihyeok rejected me not because we were family.
Maybe it was simply because I had no appeal as a woman. Because he didn't love me. The possibility drove me insane.
Every kind of negative emotion tore through my heart: jealousy toward Subin, self-loathing for having built up those expectations on my own, and the fear that Sihyeok might abandon me.
How long had I cried? After crying until my tear ducts felt dry, I realized it had grown completely dark outside.

I stared blankly at the ceiling with swollen eyes. Then it happened.
-Click.
The front door opened with a familiar sound. It was Sihyeok.
Startled, I quieted my sobs and hurriedly hid beneath the blanket. I didn't want him to see me like this—weak, ugly, and blinded by jealousy.
Sihyeok's footsteps gradually drew closer. Finally, I felt him sit beside me as the mattress sank slightly. I held my breath.
Sihyeok's large hand slowly stroked my back over the blanket. It was a warm, gentle touch.
At that touch, the tears I had desperately held back threatened to spill again.
After giving me plenty of time, Sihyeok asked,
“Do you want to have sex?”
His voice was incredibly gentle. But those words stabbed straight into my heart like a dagger.
This was pity.
He was trying to sleep with me because he pitied me after seeing how much jealousy was hurting me. Like giving a crying child a piece of candy.
I hated myself for feeling as though I had burdened Sihyeok. I felt like an annoying little sister who had made Sihyeok worry.
I have to refuse. Of course I have to refuse. I don't want this pity sex.
I have to refuse.
But….
“Yes….”