Throughout the weekend, Deokbae kept sending Siu pictures and videos of Heera, and Siu masturbated to them. To think that he was masturbating to his crush having sex with a friend... Siu found himself loathsome and pathetic.
He hated Deokbae for using these images as masturbation material. He detested how Deokbae didn't treat Heera with care. He found it strange how Heera didn't resist. He felt betrayed by Heera, who moaned vulgarly like a porn actress.
Yet, whatever they did, Siu had no right to intervene. All he could do was jerk off.
"Ha ha... This is just pathetic..."
Siu had liked Heera because she was different from other girls. Unlike his classmates who only cared about dressing up and partying, Heera was diligent and innocent. Siu had thought her purity was beautiful.
But now, Heera was...
"Uhng, haa... Like this? Huh, haah! Hot, haaa!"
She had become a vulgar pervert, riding Deokbae and moving her hips on her own.
Tormented by this reality, Siu grabbed his re-erected penis.
Siu, too, could not deny that he was a pervert.
====
Over the weekend, he had her again and again, and took photos and videos to send to Siu, telling him, "If you're bored, jerk off to this." Though there was no reply, the "1" disappearing indicated Siu was likely busy masturbating.
"Heera, suck me off one last time."
"Fuck... You're taking pictures again?"
"Of course. We need to document our precious moments."
"Pervert..."
Just after finishing inside her, with her privates still messy from both their fluids, Heera grudgingly but diligently sucked him off. Initially resistant, she seemed resigned now and followed his instructions.
"Yawn, sst, slurp, haa... huh, euh, sswup, pah..."
Thanks to that, her oral skills had improved significantly. Despite complaining about teaching her such things, Heera practiced them diligently. She seemed eager to be praised, sucking even harder when her head was stroked as if her desire for approval was strong.
-Click-
And thanks to that, he could take such arousing photos. Comparing yesterday's pictures with the before and after, he felt they were even more arousing.
"Heera looks the third prettiest when sucking dick."
"...Slurp, ha... ssp, juup..."
"The second is when she's getting fucked by my dick."
"Huh... Can you shut up?"
"The first is right now when you're cursing. So fucking hot. I can't help it. Let's do it one more time, Heera."
"Wait, no! Stop it! Ah, noo! Ugh, haah!"
She verbally resisted but her body did not. At this point, Heera was completely fallen... Yet he still hadn't achieved Grade A. He thought it would end quickly, but it kept dragging on.
"Aah! Stop, ha, raah, huuh... gooo! Aaah!"
More?
====
"Hi Heera..."
"Ah, Siu... Hi... How was your weekend...?"
Siu and Heera, classmates in the same major, shared three classes together. Naturally, they often ran into each other in the lecture hall.
"Yeah... I heard. You're dating Deokbae? ...Congratulations."
"Uh, yeah..."
The problem was that they always sat next to each other. While they used to sit together with excitement and anticipation, now they couldn't concentrate due to the awkwardness.
For Heera, it was difficult to look at Siu. Whenever she saw him, she remembered the time spent with Deokbae over the weekend. Despite still liking Siu, she felt too miserable for allowing herself to be with Deokbae and couldn't meet his eyes.
For Siu, it was hard to look at Heera. Whenever he saw her, he remembered the masturbation material Deokbae sent. Despite still liking Heera, he was embarrassed by masturbating while watching them have sex, and couldn't meet her eyes.
Therefore, they exchanged greetings but couldn't bring themselves to say more. The lecture time felt excruciatingly slow, tormenting them both.
-Clunk-
Suddenly, Heera stood up and left the lecture hall. Siu thought she might have gone to the restroom, but even after 10, then 20 minutes, Heera didn't return. Worried she might be unwell, Siu became concerned.
-Zzzing-
But it wasn't for that reason.
[Deokbae: I'm fucking Heera.]
[Deokbae: Sent a video.]
Heera had gone out to meet Deokbae.
Siu checked his surroundings, lowered his posture, and secretly saved the video. Then he muted his smartphone and played the video.
"Ugh..."
In the video, Heera was being fucked by Deokbae in a cramped restroom stall.
"...Aaah..."
Naturally, Siu was aroused. He felt like his dick might burst and thought about going to the restroom to relieve his urge.
But then
-Slide-
Heera returned to the lecture hall.
"..."
Her hair damp with sweat, clothes wrinkled, face flushed, and a lewd smell... A woman who had just had sex sat next to him.
-Zzzing-
Another message from Deokbae.
[Deokbae: Sent a photo.]
It was a photo of Heera's vagina dripping with Deokbae's semen.
*****
Siu couldn't bring himself to ask Deokbae to stop. He had become addicted to the masturbation material provided by Deokbae.
From Heera masturbating in a corner of a cafe's second floor, to performing fellatio in a deserted karaoke room, to her riding him in his own apartment—Deokbae continued to send such messages, and Siu would head to the bathroom whenever they arrived.
A week passed, and Siu found himself unable to achieve an erection without Heera's photos or videos.
"Ah! Yes! Fill me up! Impregnate me!"
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But as days passed, the stimulation from Heera weakened.
The Heera he knew—pure, who dyed her hair, exposed her bare legs, and flirted with cute smiles—was no longer the girl he knew. She had become like the women he despised.
In the videos, Heera had changed drastically within a week. From a virgin just awakening to her sexual desires, she had turned into a woman who couldn't live without sex. The shy moaning Heera was nowhere to be seen.
As his feelings for Heera faded, Siu found himself not as aroused by the videos of Heera having sex. He needed new stimulation.
So, he sought out new encounters. Yejin was different from Heera.
Unlike the introverted Heera, Yejin was vibrant and a social butterfly, surrounded by friends. Yet, like Heera, she blushed and was shy at any sexual talk, an innocent virgin.
Siu was drawn to that and quickly befriended her. This time, he didn't miss his chance and confessed; they easily started dating.
But... oddly, he couldn't get aroused with Yejin. Even after taking her to a motel and undressing her, he couldn't maintain an erection.
Yejin tried to comfort him, but it was no use. The only thing that did comfort him was the video of Heera stored on his smartphone.
"Come on, fuck me... quickly, fuck my pussy, make me come!"
Though Heera no longer provided enough stimulation, strangely, this video still excited him.
"...Ah... So that's what it was."
After reaching a post-ejaculation epiphany, Siu figured out the reason and immediately contacted Deokbae.
"Deokbae, can you take Yejin too?"
Sending the message, Siu was more aroused than ever.
====
[Mission Clear!] [Result: Grade A, Points Gained: 14800] [Achievement Unlocked: 'Developing the Protagonist's NTR Fetish'] [Clear Reward: 'Sleep' Skill]
Siu had moved on from Heera and made a new girlfriend, and just when Deokbae thought he had messed up, he received a notification of achieving Grade A. Curious as to why, he soon received a message from Siu asking him to sleep with his girlfriend. Showing Siu daily videos of Heera being taken seemed to have broken him.
Having achieved his goal, Deokbae decided to return to reality instead of taking Siu's girlfriend, as messing with the obedient Heera had become less interesting. There was no reason to stay longer.
But... 'Developing the NTR Fetish'? Oh Siu, you really are a peculiar one.