Soo-jin's full, glossy lips parted in shock, her cheeks flushing a shade of pink that traveled all the way down her elegant neck and disappeared into the deep, overflowing valley of her massive E-cup tits. Those heavy, soft breasts were heaving with every shaky breath she took, straining the thin white blouse so hard that the black lace bra was practically screaming for release.
"Above the cutoff mark?" she whispered, her voice barely above a breathy murmur. Her thighs pressed together instinctively, and I swear I saw a tiny tremble run through them. "Are you serious, Young Master?"
"Dead serious, Teacher Park," I replied, flashing her my most angelic smile. "Just one test. If I score forty points or more, then you have to do whatever I want. No backing out."
She swallowed hard. After a long pause, she nodded once, sharp and professional. "Very well. But I expect you to take this seriously."
I laughed softly. "Why would I make the deal if I wasn't?"
I kicked the silk sheets all the way off, standing up in one smooth motion. Without saying another word, I walked straight past her toward the walk-in closet. Soo-jin gasped audibly, spinning around so fast her ponytail whipped across her back. "I will give you some privacy."
I shook my head. "No need."
I slipped into something simple: a white button-up and loose shorts. When I turned around, Soo-jin was already sitting at the reading desk, her back facing me.
I couldn't help but smile at her innocent gesture.
"Better?" I asked softly, and just as she was about to turn, I gasped loudly, which made her whip her head back to the side.
A soft laugh escaped my lips, and when I stepped in front of her fully dressed, she couldn't help but cover her face with her palm, partly in annoyance and partly because she had been acting like a teenager who just passed the boys' locker room.
Soo-jin cleared her throat, adjusting her glasses with her delicate fingers. "L-let's move on to studying, please."
I nodded once and sat beside her, so close that our thighs pressed together firmly, her soft, warm flesh molding against my hard muscle through the thin fabric of her skirt. I crossed my arms over the chair so her shoulder would be in between my armpits.
Soo-jin glanced at me, and I just smiled softly. She let out a sigh and pulled out a printed test from her folder, handing it to me. "This is the diagnostic exam I was planning to give you at the end of the week. The test consists of ten questions with ten points each. If you can get up to forty, then I will gladly do whatever you want."
I took the paper with one hand and read the questions one after another:
1. Solve the quadratic equation: 2x² + 5x - 3 = 0 (10 pts)
2. Find the derivative of f(x) = sin(3x² + 2x) (10 pts)
3. Integrate ∫(x³ + 4x² - 5) dx (10 pts)
4. Solve the system: 3x + 2y = 7, x - y = 1 (10 pts)
5. Evaluate lim(x→0) (sin(5x)/x) (10 pts)
6. Find the antiderivative of sec²(2x) (10 pts)
7. Simplify: (x⁴ - 16)/(x-2) (10 pts)
8. Solve for x: log₂(x) + log₂(x-3) = 2 (10 pts)
9. Find dy/dx for y = e^(x²) * tan(x) (10 pts)
10. Determine the radius of convergence for the power series Σ (n! x^n)/n^n (10 pts)
Soo-jin smirked at my blank reaction before leaning back, not even caring that my arm was there. Her skin was very soft, which was honestly distracting, but it wasn't like I couldn't get up to forty even with the distractions.
I picked up the pen, though my eyes kept drifting to Soo-jin—specifically to the way her blouse gaped open every time she leaned forward to watch me, giving me a perfect view straight down her cleavage. Those enormous tits were practically spilling out, soft pale flesh squeezed together into a deep, sweaty valley I wanted to bury my cock in.
I shook my head as soon as I noticed her staring directly at me.
"Well…" she said, still smirking. "Can you solve them?"
"Number one," I said aloud, voice casual. "x = [-5 ± √(25 + 24)] / 4… so x = 0.5 and x = -3."
I deliberately messed up the next few—simple mistakes on purpose—and got some right. After I was done with all of them, I handed the paper over to her exactly thirty minutes after the start of the test. She took it, red pen in hand, and started grading in silence, her eyes widening more and more with every mark.
When she finally looked up, her face was pure shock. "How?" Her words came out breathless. "How exactly did you get exactly forty points? You got questions 1, 3, 5, and 7 perfectly right, but the rest… you somehow failed them? How—how did you get exactly the cutoff mark? It's like you knew the answers but chose to stop at forty!"
I held her gaze, letting the silence stretch again until it became uncomfortable.
"That," I smiled softly, "is none of your business, Teacher Park."
Her lips parted, but no sound came out.
"You agreed to my terms, remember?" I continued, voice low. "If I get up to forty points, you do what I say."
She looked down at the paper again, as though it might change if she stared hard enough. When she finally spoke, her voice was barely above a whisper.
"What… do you want?"
"It's actually something simple."
She raised a brow, and I continued. "Tonight," I said, "you're going on a date with me. But you wear exactly what I choose. Easy, right?"
I stood up and walked to the tall wardrobe in the corner of the room. From the back, I pulled out the dress I had prepared the moment I learned about the five tutors—a cherry-red gown made of soft, clinging silk. The neckline plunged dramatically, and the back was completely open down to the base of the spine, and the side slits ran high enough to reach her hips. Elegant enough to pass in public, devastating enough to make anyone who saw her remember it for weeks.
I held it up, letting the tiny thing dangle from my finger. "Change into this. And I don't mean in the dressing room—I mean right here, in front of me."
Soo-jin's eyes went huge. "Y-Young Master… I can't! I'm married! I have a husband waiting at home—I can't just—"
"Even better," I cut in gently, stepping closer so the dress brushed against her folded arms. "Doesn't that make it so much hotter? A proper married woman like you, sneaking out in a slutty little dress with her student? Don't just think about the dress; think about the things you can earn from this deal. Don't you want to march into my father's office tomorrow and brag that in just one single day you managed to make the useless Kim Ha-joon score forty points on a university-level test? Imagine the praise, the bonus, the respect. All because you did one small thing for your student."
Her gaze dropped to the dress, then to the floor, then to her own hands clenched tightly in her lap. The silence that followed was the heaviest yet. I could almost hear her thoughts—the guilt, the ambition, the fear, the calculation. Her shoulders rose and fell with each shallow breath.
Finally, after what felt like forever, her shoulders sagged in sweet defeat.
"…Fine," she whispered, voice barely audible, cheeks burning crimson. "I'll… I'll do it."
With shaking fingers, she reached behind her, found the zipper of that tight black pencil skirt, and slowly—oh so slowly—pulled it down. The sound of the zipper teeth separating filled the room in an instant, and the fabric of the skirt loosened around her wide hips.
For several heartbeats, she just held it, knuckles white. Then, very slowly, she began to pull it down.