Potential Breakthrough

The moment my mouth left hers, she collapsed onto the bed as if the effort had finally drained her. The ass that had been teasing me so brazenly flopped sideways, limp and spent.

I shifted forward, my cock standing rigid, and brought it right up against her rear. Both hands seized her hips and forced them back up, locking her into that cat-like pose once more.

"Haa… haa… Do we still have to keep going…?"

"We're almost there. When the mana pathways open, it's going to hurt a little. You can handle it, right?"

"Hhk… O-of course I can."

She had the blanket pulled over her head, so she couldn't see me presenting myself. Naked except for that scrap of fabric hiding her face—apparently that was the last fortress protecting her towering pride.

I didn't care what she was thinking. I rubbed the head of my cock against her ass. The unfamiliar texture finally registered; Kim Isol realized something different was pressing against her.

"W-what the hell are you rubbing on me!?"

"Look forward to it. You're going to get stronger, Isol. Just enjoy it."

"B-but… Hnnngh!!"

Her consent mattered less than my need. I shoved straight into her depths without warning.

Guh.

The tightness was no joke. What the hell?

I had never felt pressure like this during sex. Was her hole itself just that narrow? How was she so different from every other woman?

It felt like her pussy had grown a hand of its own and was squeezing my shaft in a merciless grip that drove me insane.

"Hwaaahhh… It hurts… Hwaaaahh… Hhk."

The same crushing tightness that was wrecking me was clearly flooding her with overwhelming sensation; her reactions were so violent she sounded like she was choking on her own breath. Meanwhile I was drunk on that grip, completely ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠forgetting she was a virgin as I snapped my hips again and again.

My waist was bouncing on its own. What the hell was this pleasure?

"Hhk… Khh… Hwaang… Hhk…"

Every time I buried myself deep she made the sound of someone being strangled, like she was dying. Because the space inside her was so cramped, every withdrawal felt like something was yanking my cock back in. Kim Isol was taking me with her entire body.

Looking down, even her asshole kept opening and closing in time with my thrusts.

After a while of that she finally gave out, collapsing flat onto the mattress and abandoning the cat pose. My cock still refused to leave her. I draped myself over her back as she lay face-down in a straight line and started thrusting again—and this position squeezed me even harder than before. The sensation along my entire shaft was completely different.

"Hik… Hhk… Hnn…"

Kim Isol no longer spoke; only broken moans escaped her. I couldn't see her face under the blanket, but the white-knuckled fists clutching the sheets told me she was enduring pure pain. That pain, however, translated into pure ecstasy for me. I was one thrust away from flooding her insides right then.

I barely held back. The urge to come was twice as strong as usual, so I stopped my hips and carefully pulled out.

Not yet.

Synchronization was still only at 11 percent. The road to one hundred was long—painfully long.

‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠

Was it because she was a close-range dealer that her muscles were on another level? Why was the grip inside her so absurdly powerful? Was this bitch Kim Isol one of those legendary natural-born masterpieces you only hear about?

A little blood was trickling from her pussy; I gently wiped it clean. Baek Hwayeon hadn't bled, but this one was flowing bright red. Today felt far more like I'd actually taken a virgin than yesterday. I'd been rougher with her than with Hwayeon, so of course it hurt. She should have behaved better from the start.

I cleaned around her thoroughly, then rolled her onto her back so she lay face-up. Part of the face that had been buried under the blanket came into view. I yanked the covers away completely to check.

Spit and tears everywhere. Was this really that same Kim Isol?

"Did it hurt?"

"No… not at all."

"We're not done. Almost finished now."

"Hhk… How much longer are you going to do this?"

"Why are you crying? Didn't you say you'd endure anything to get stronger?"

"I'm not crying. Hhk… Who said I was crying…"

The more I asked why she was crying, the harder Kim Isol sobbed. Sorry, but tears won't stop this. So please just stop crying already.

"Want to quit? Your mana still hasn't come back, you know."

"I'm doing it. Keep going, hurry up. You fucking bastard!"

I should have a drink alone with Kim Isol sometime. Why was she so obsessed with getting stronger? Why throw away every scrap of pride and bawl her eyes out doing something she clearly hated, just to become powerful?

Seeing her cry almost made me soft. Or maybe it was simple curiosity. Still, she was going to be my slave from now on; a little welfare wasn't out of the question. Depending on how she performed later, I could always change my mind.

Under the bright overhead light I slowly studied Kim Isol's completely naked body on the bed. Even after all those tears my cock hadn't wilted. If anything it throbbed harder. Watching that stubborn, vicious woman cry in front of me only made me stiffer. I usually hated sniveling women… Had I gotten drunk on the competitive urge to break her?

Right then I wanted to shove my cock into that small mouth of hers. I wanted to see her face while she sobbed and humiliatingly sucked me. But I didn't—too high a chance she'd bite. I still couldn't trust the bitch. Even with a shield I wasn't risking it. My precious is precious precisely because it's precious.

Earlier I hadn't cared about her pleasure at all; I'd only thrust for my own satisfaction. This time would be the same. A few tears weren't going to change a damn thing.

I climbed on top of her and started rubbing my cock against her pussy. Wiping away the blood had also wiped away all her juices, leaving her a little dry. She needed more lubrication, but my cock was ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠impatient. Would it hurt if I just pushed in like this? I hadn't wiped inside, so it should be fine, right? No need to overthink it. I wasn't the one who'd feel the pain.

I shoved into her without further hesitation—this time slowly.

"Hhk… I-it hurts…"

I forced the tightly closed slit open with my cock, spreading her as I sank deeper. I pushed so carefully I could feel every fold of her walls against the tip of my glans. Her grip was still no joke. What the hell was her insides made of? I was going to get addicted to this.

My slowly advancing cock finally bumped against something deep inside—the end of her vagina. It rubbed gently against the entrance to her womb. At the same time her inner walls began contracting and relaxing in violent waves. Even without moving my hips I was already on the edge of coming from that incredible pulsing.

"Ugh… This is seriously driving me crazy…"

"Hwaaaang, haang… It hurts… Hnnn…"

Even after the short break, the sensation rocketed straight back to the brink of orgasm. Holding it in made my sides ache. I draped myself over her and sealed my lips over her tear-and-snot-smeared mouth. The kiss I'd wanted Monday night finally happened now. Kissing while buried inside her was always electric. Her soft lips felt incredible.

Kim Isol didn't reject the kiss. Whether her mind had already checked out or she'd simply given up on everything, I couldn't tell. From now on you'd better obey every word I say, you bitch. Then you'll get strong enough to crush even A-class hunters.

Ah—I couldn't hold it any longer. I tore my mouth away from the one-sided kiss. Kim Isol was a mess of my spit, her spit, tears, and snot. I hurriedly pulled out and brought my cock to her lips, then shoved it straight into her mouth.

"You have to swallow all of it, Isol. That's how your mana rises."

"Mmph… Mmph… Hhk…"

I flooded her throat with a thick load of cum. Even after I finished I kept my cock buried so she would swallow every drop. Apparently I'd gone a little too far; she couldn't breathe through the snot and started clawing and pounding my thighs. The shield left no marks, but watching her thrash filled me with the pure intoxication of total victory.

"Ghk… Hhk… Khaak…"

She tried to spit it out instead of swallowing, but it had already slid down her throat into her stomach. If she blew her nose, cum might come out instead of snot.

Making her drink the cum had clearly worked; the number jumped quite a bit. Still nowhere near Yoo Dajeong's record high, though. Mutual chemistry really did seem to matter. That first time with Dajeong was burned deep into my memory—the most intense, satisfying sex I'd ever had.

Ah, damn. I'd forgotten to give her mana back. I considered the best method, then hit on a good ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠idea. I wiped her body down with a towel, cleaned her face thoroughly, then carefully sat her up and pulled her into my arms. Sitting on the bed, our bodies pressed together completely.

"What… It's still not over?"

"It's over now. Lean on me and hold me as tight as you can."

"Mm…"

Kim Isol's voice had no strength left. It had been her first time; the shock must have been huge. Forcing it this way left me feeling a little guilty, so I decided to give her an excessive gift. There was also a testing purpose since this was the first time.

We were both naked, still weak from the sex we'd just finished, clinging to each other. Sitting on the bed with her ass resting on my thighs, I hugged her so tightly our lower abdomens and chests were perfectly flush. If I hadn't just come, the scent of her skin and the soft feel of her flesh would have made me hard again instantly.

"Hold me tighter."

"Mmh…"

First I returned her mana.

"M-my mana…"

"Hold me even tighter. Think that you never want to let go even if you die. That's how your mana rises."

"Mm… I am…"

I began raising her mana little by little. From that point I said nothing more. But Kim Isol started rubbing her body against me on her own. She must have felt her mana climbing stage by stage. Each rank roughly doubled the previous amount, so even someone dull would notice.

"Th-this is impossible… This easily…"

The moment she opened her mouth I stopped the increase. She grew frantic, hugging me harder and grinding her chest against mine until her breasts flattened. At this rate she might even kiss me.

Watching her rub her naked body against mine while desperately hoping for more mana made her look a little cute—and a little pitiful—so I raised it again. I still needed to look like I was helping, so one of the arms wrapped around her slid down and firmly grabbed her ass.

"Hhk…"

Another rank up. Kim Isol's breathing grew steadily faster. Was she finally starting to feel orgasm? Her rapid heartbeat transferred straight into my chest, along with that uniquely sweet scent of her skin. Sex was great, but just holding a beautiful woman like this wasn't bad either.

Huh?

This time she slipped a hand under my ass and squeezed. What was this woman doing? Ah—she was copying me? And right then her mana rose again? Hilarious. I almost burst out laughing. Had this girl always been this cute? Well, if you looked closely it was pure greed, but everyone had a little of that.

Before long her mana had reached F-10. But that wasn't the end. The gift I intended to give her today was a potential breakthrough. I planned to spend one of her potentials to raise her mana into E-class.

She could use a total of six potential breakthroughs. That meant she might ultimately surpass A-class and possess S-class level mana. She had the talent to become stronger than even Min Hyeokju or Lee Daeman. Completely absurd.

Anyway, with synchronization at 24 percent I had possessed 25 points; raising her mana to the limit had cost 9. Now came the potential breakthrough.

Before selecting YES I spoke to Kim Isol. If I wanted to have fun with her again later, I needed to choose my words carefully.

"We're not done yet. This isn't your limit, Isol. You can get even stronger."

"…Really? Then what do I have to do? I'll do anything…"

Kim Isol, who had never imagined her mana could skyrocket like this, hugged me tighter and rubbed her body against mine at the mere mention of further growth. We had already been clinging for several minutes; sweat was dripping from every place our skin touched. Neither of us had any intention of pulling away. Me or her.

And my cock, which had gone soft, stood up again. The tip still stung a little, but I wasn't planning to put it back in, so it didn't matter.

I turned my head and met Kim Isol's eyes. Without a word I brought my face closer and slipped my tongue into her mouth. Her eyes fluttered shut. A little disappointing—this kiss would have been better if we'd both wanted it.

While our mouths were locked I slid the hand that had been around her waist lower, slipping it into the cleft of her ass. When my fingers brushed her asshole she startled and went wide-eyed like a rabbit, but she didn't break the kiss. My hand continued downward and began gently massaging her pussy.

At the exact same moment I selected YES.

Huh?

What the hell was this? Suddenly my lower body grew warm. It was a damp, moist warmth.