“Okay, let's time this, go get your phone. We can use it to time your attempt to make me cum.” Joon instructed her.
“Okay Oppa.” Seohyun went to the desk nearby, where she left her bag, and returned with her phone.
“Good. Later, if you manage to make me cum in 20 minutes, you will get to drink my hot jizz. I will aim it at your mouth, all you have to do is open wide, though you might have to move a bit to catch most of it. But don't just swallow it quickly once it is in your mouth. Let it collect in your mouth, and swirl it with your tongue; you want your tongue and throat to really feel the cum. Then when you swallow, do it slowly as well, let the cum gradually flow down your throat so it can help warm your throat too. Okay? You want to maximise the effects.”
“Right Oppa. I will do as you say.” She nodded her head in understanding as she set the stopwatch function on her phone to 20 minutes.
She had no idea, of course, but this was more for his own personal satisfaction.
“Wait, let me put on my underwear and pants first.”
“Why Oppa?”
“You have got to count the time needed to remove my clothes too, you know.”
“But... Oppa, that's unfair!” She bit her lips and pouted at him again.
“You have to get used to it. We want this to be as realistic as possible. You will have to remove the guy's clothes if you are going to do fellatio in the future, right?”
He replied with a smile.
- - -
Seohyun reluctantly accepted as Joon went to get his clothes outside in the main studio room. He came back a short while later, fully dressed, while she is still in her bikini top and G-string. He sat on the couch, while she knelt in front of him.
Her heels were removed, she remembered how tiring it was to kneel down with heels. The bottle of lube was placed next to her within easy reach. She recalled how the lube made it easier to stroke the dildo.
Everything was prepared. She wanted to remove all obstacles and try her utmost to succeed in her task of making him cum in 20 minutes or less.
- - - - -
“Ready..” Joon opened his legs wide as he sat on the couch's edge and leaned backwards.
“Get set...” Seohyun shifted her body right between his legs, close to his crotch.
“Go!” He started the clock.
She swiftly unzipped his pants, then pulled it low, exposing his boxers. Next, the boxers were also removed in record speed, and his still aroused 'monster' burst out in her face. With the clock counting , she did not even have time to admire his cock, but still she looked hard at her favourite 'monster' , taking a few precious moments to remember its impressive length and girth. It was thick, meaty, and had monstrous looking veins pulsating along the impressive length, with a reddish slit and a thick, round glans.
And then she started.
- - -
Seohyun swiftly repeated what she did earlier in the car trip earlier; except now she used both her hands. She carefully and gently grabbed his 'monster' , then applying lube, she began sliding her left hand up and down the shaft of his cock, while her right hand was gently rubbing and caressing his swollen glans; feeling it under her thumb and palm.
Using her thumb and fingers, she rubbed and stroked his reddish tip, and then she moved to the underside of his cock. Then she pushed her thumb up and down the bottom side of his tip along his frenulum, causing little pulses of pre-cum to push out of the slit, as she literally was squeezing his pre-cum out from below.
This instantaneously brought out a loud hiss of pleasure from Joon. “Shit, she is doing things like this without even been taught or seeing it before?”
- - -
Her dexterous hand was magical, despite her inexperience. Seohyun had to concentrate fully, afraid she might be too hard and cause pain or make him uncomfortable , and yet at the same time, worried she was too gently and would fail to make him cum in 20 minutes. She remembered the feverish pace which the brothers did when they masturbated in front of her. But she could not do it like they did.
After several minutes, she was able to get him to an astonishing 9 inches long. His 'monster' was truly now a monster, gleaming wet and rock hard, pointing upwards into her face. She slowly increased her pace, and gripped a little tighter; all the while keeping an eye on the clock counting down on the couch next to the two of them.
But soon, she realised she is stuck. All she can do is just stroke and grip, and touch and rub his swollen tip. That is the extent of what she can do, and no more. Try as she might, she cannot think of what else she can do with her hands to increase the pleasure more. She increased her speed more, but that just tires out her hands. As the timer on the phone jumped on and on, and the amount of time she has left became shorter and shorter, the pressure increased and she started to worry.
- - -
Joon was of course, trying his best to endure. Having his dream slut Seohyun do a hand-job on him is surely amazing, but he had to complete his plan. And amazing as she is for a girl with so little experience, she is still far from being fantastic. He could soon see that she is at her limits. Watching her increasingly frustrated face and determined eyes, he smiled.
He knew there was more she could do with her hands, but he kept quiet, hoping to push her to desperation and make her use her mouth or breasts.