"Alright," Roxy said, cracking her knuckles. "Level 14 Sex Dungeon. The last one... until I level up Dungeon Master again, anyway."

"Tomorrow... Level 14 Normal Dungeon," Nicky said.

"Have you finished up with your end of the mentorship contract?" Roxy asked.

"...No," Nicky admitted. "We're still working on tactics drills. It'll be another week."

"She's antsy about leveling up," Akane said. "The Sex Dungeons really, really are not worth any XP. Last night's Level 13 Sex Dungeon was worth as much XP as a regular Level 3 Dungeon."

"Yeah, there's a reason they're considered novelties," Roxy said. "Well, a lot of reasons, really. But the fact that delving them doesn't give jack shit for XP and the loot is almost always useless for anything besides fucking does mean there's no motivation to delve them besides wanting some weird sex."

"Except for us," Lisa said. "Because we've got a unique class that's powered by cum."

"I have absolutely no goddamn idea how to explain that to the Guild," Roxy admitted. "The existence of the Incubus and Succubus classes would explain why I built an adjustable Sex Dungeon Gate, because then it's just a hard-nosed practicality-"

"More like hard-cocked practicality," Akane said.

"-but it would also produce so many more questions," Roxy said. "Difficult and embarrassing questions that I would really like to avoid answering."

"Well..." Lisa began.

"Ah, shit."

"You're the highest-level Dungeon Master in the world right now," Lisa said. "And you're a Guild member. And you have multiple mutual acquaintances with Ariel Ironborn, the leader of the Guild."

"Yeaaaah, she's gonna wanna talk to me, isn't she," Roxy murmured.

"Oh, she already wants to talk to you," Lisa said. "She just recognizes that you're busy with research, and that she's busy with Guild administration."

"How do you..."

"She told me herself, when I was at the Guild with Nicky and Akane's new party. So yeah, that's the message I'm supposed to pass along: Ariel Ironborn wants to talk to you at some point, and she won't sign off on the construction of a Level 14 Dungeon Gate until you do. She also said that building that Dungeon Gate was a long ways off, and that she didn't mean that to sound as much like an ultimatum as it ended up sounding."

"...Alright, well, I'm gonna just. Bottle that up for the time being and drown my good sense in a Level 14 Sex Dungeon."

Roxy approached the Gate, pushed the button, and then stepped through.

"Huh, a boss door connected to the entrance," Roxy said.

"Should we back out and try a different one?" Lisa asked.

"Eh." Roxy shrugged, and rolled her neck around, doing a few stretches. "I'm not letting that mana go to waste. If this is disappointingly short, we can just run it again. Not like we actually have a deadline we need to finish our Sex Dungeon Survey by."

"We've seen this pattern before, too," Akane said. "Level 1 was just the entrance and a boss room, and so was Level 7. Remember, the one with the cowgirls?"

"Hrm... Okay, so, this one boss room is, therefore... probably going to be enough to make all of us cum," Roxy said, nodding. "Possibly multiple times."

"Well, hell, what're we waiting for, then?" Lisa asked.

Roxy stepped forward and opened the boss door, revealing an... interesting scene.

A pair of beta exemplars awaited them in the boss room, both of them incandescently gorgeous and shaped like fertility goddesses- breeder's hips, fat mommy milkers, big bellies, and thick cocks. One of them stood primly and properly, yet completely naked with her body on display, whereas the other sat up on a mildly-low table, her legs stuck straight up in the air to proudly display how thick her ass was, and one hand cupping her balls up and out of the way to display how wet her pussy was. The two were identical, really- the fact that one of them had a plainly-visible pussy, with her cock and balls having been lifted out of its way, was the only reason anyone was confident pegging them as beta exemplars rather than simply particularly busty alphas- after all, beta exemplars had an alpha's cock; the usual trick of looking for a knot would only distinguish ordinary betas.

The only ways in which the two were not identical were in coloration and some minor features. The prim and proper one had pale blue skin and golden hair, whereas the ready-to-fuck one had deep red skin and black hair.

Oh, and one was an angel, and the other a demon.

"Welcome," the two said in unison.

"To Heaven-" the angel said.

"-And Hell," the demon said.

"Heaven asks that you give selflessly to others," the angel said.

"Hell invites you to give into temptation, and take the pleasure you want," the demon said.

"So... the angel's challenge is to make her cum as many times as you can manage," Roxy said. "And the demon's challenge is to make yourself cum inside her as many times as you can manage?"

"Well, sure, if you wanna be prosaic about it," the demon said.

"'Prosaic,' hm?" the angel asked. "I must be rubbing off on you."

"I know I'm rubbing off to you," the demon leered, prompting the angel to affectionately roll her eyes.

"So, anything goes, here?" Nicky asked.

"More or less," the angel said, nodding. "The bare minimum for success is three orgasms for each of us."

"That gets you the basic bitch prize," the demon added. "Go above and beyond that, though, and you'll get something better."

"What about one particularly long and drawn-out orgasm?" Roxy asked. "That's kind of our specialty, more than multiple consecutive orgasms is."

"Hrm... How long are we talking?" the demon asked.

"How long can you tolerate?" Roxy countered.

"Hah! Tell you what- give us some orgasms that last at least five whole minutes, and we'll give you something nice," the demon said.

"But, of course, if you go above and beyond that..." the angel trailed off. "My name is Lucy, by the way."

"Volex," the demon introduced herself.

"I'm Roxy, that's Nicky, that's Akane, and that's Lisa," Roxy said. "So, every hundred seconds slash one and two thirds minutes of continuous orgasm counts as one orgasm? Five minutes equals three?"

"Basically," Lucy agreed.

"We can work with that," Akane said, nodding and stretching her arms behind her back. "So, Roxy, who's taking who?"

"I think... you and I take Volex, while Nicky and Lisa take Lucy," Roxy said. "Oh, and uh. When you're figuring out your positions, make sure you're aware of precisely how long we're all gonna be here. Don't inflict that much bored voyeurism on yourself."

"Got it," Lisa said, nodding.

"So, what's this secret technique of yours?" Volex asked as Roxy and Akane approached her.

"I found a unique sex-based slotless class unlock in the first Dungeon I ever created myself," Roxy said. "It has a lot of interesting benefits that I can share with my girlfriends, though."

"It's pretty simple, really," Akane said as she straddled Volex's waist and lowered herself onto the demon's thick, breeder's cock. "The people she fucks absorb cum to power her abilities, and also get an orgasm out of it."

"At this point," Roxy added, setting a portable mana generator on the floor next to where she'd be standing. "We've gotten some damn good stuff together to make the most out of it. Hrm... Yeah, one barrel oughta be enough."

"...What?" Volex asked, watching as Roxy tapped a barrel of Level 13 mana potion and connected it to the mana generator.

"You'll see," Roxy said, taking out her cock and lining herself up with Volex's pussy.

"We, meanwhile, won't need any of that equipment," Lisa explained as she unzipped her jumpsuit to reveal her dick. "All we need is each other."

"And for you to lie on your side," Nicky added, stowing her scalemail armor in her inventory.

"I can certainly accommodate that," Lucy said, crouching down and leaning over onto her side.

"Alright, so... okay, I'll get her dick, she'll get yours, and you get mine," Lisa said. "That way, I can disengage from you, but you can still keep her cumming."

"Makes sense," Nicky said, nodding and lying down next to the angel. "Alright, Lucy, open your mouth for me, please?"

Lucy opened her mouth, allowing Nicky's own cock to slide in easily. Lucy may not have had the Succubus class or all of the very nice bespoke enchanted gear Roxy had made for them, but her throat was still deep and pliable, and Nicky hilted herself without discomfort.

Lucy moaned a little around Nicky's cock as her own angelic member found itself engulfed in a warm foxgirl throat. And then, although Lucy couldn't see or feel it herself, Lisa's cock found itself in Nicky's mouth, completing the circle of fellatio.

"Now, we could get these chain reactions started the normal way," Roxy explained to Volex, grabbing onto the generator's pylon. "But, well. I need to use a special spell to turn mana into cum, so if I'm casting spells anyway..."

"I'm a bit confused, but..." Volex shrugged. "It's all about to make sense soon, isn't it?"

"You'll see," Roxy confirmed, nodding. She turned to point at Lisa. "[Orgasm]."

Lisa came instantly, with a jerk of her hips, and barely a moment later, Nicky was cumming too, followed shortly thereafter with Lucy's own orgasm, making her cum in Lisa's mouth and start the cycle all over again.

"Ahhh, lovely," Roxy murmured. "They make so much cum like that... A shame it'd take days for that to pay for Level 5 in Incubus, but at least they're enjoying themselves. Now, before I forget about you..."

"You don't have anything inside you," Volex pointed out.

"Mhm," Roxy said, nodding. "It's a bit of a weakness- I just can't stand that sort of thing, for myself. If I didn't have the options I had, I would've just sicked Lisa on you and Nicky on Lucy. But, well... I do have the options I have. And I'm about to show you one of them." She closed her eyes and took a deep breath, centering herself. "[Mana Flood]."

Immediately, Roxy started to cum, her mind going blank as her vast mana pool began to convert into jizz... and then was topped back up by the mana generator. 

It had been a complicated spell to develop, and it was fairly niche in its application. Roxy's mana pool was big, sure, but she was still only one Level 14 Wizard. There were limits to how much cum she could make, and it took an entire barrel of Level 13 mana potion- something she could only be so profligate with because she made them in-house- to make an appreciable amount of cum. It was something she'd used twice, and then decided to reserve for special occasions.

But, well. This was a special occasion, was it not?

And so Roxy came endlessly into Volex, and Volex came endlessly into Akane, the omega pressing a deep kiss into the beta exemplar's lips through the whole process.

Seconds ticked by, and minutes rolled on, everyone lost in a sea of ecstasy, all conscious thought gone as they succumbed to the soul-deep pleasure of such a long, profound orgasm. It was energizing and exhausting in equal measure, everyone living on the razor's edge of ecstasy and satisfaction.

It was a powerful feeling, and while it wasn't the extremely esoteric kink the party was expecting from a Level 14 Sex Dungeon, it was certainly among the best orgasms they've ever had. And that had to count for something.

Roxy had measured, both times, how long a barrel of Level 13 mana potion would last under this spell, and managed a very consistent average of one hour, give or take two minutes. That's how long Roxy's orgasm would last, and at a rate of three orgasm-equivalents every five minutes of continuous, she was quite comfortably in the clear for a good prize, where she'd clock in at 36 orgasm-equivalents. And that was just her; Akane would cum for that same amount of time, and she was also fucking Volex- or, rather, getting fucked by Volex, but, details.

When Roxy's mana barrel emptied, and she dipped below 90% of her personal mana pool, her spell ended, and so did her orgasm, letting her finally come down from that hour-long plateau of pleasure.

"Fuck a duck," Roxy muttered, drinking a stamina potion. "[Denial]," she cast on Lisa, breaking the cycle satisfying Lucy's challenge; that, too, had been going for an hour, with Lisa and Nicky working together to give Lucy 36 orgasm-equivalents. Maybe they'd both get credited for that? Or maybe not. Roxy had no idea.

She pulled out of Volex, casting a silent cantrip to clean off her dick, and pulled her pants back up, watching everyone gradually come to and separate from each other, knots deflating and cocks coming out of mouths and a pussy.

"So," Roxy said, glancing around. "Everyone have fun?"

"I suuuuure did," Akane said, kissing Volex again. "Mmm... so hot..."

"Lucy has, well..." Nicky chuckled a little. "The mouth of an angel."

"Fuck off," Lucy groaned out.

"Holy fucking shit," Volex gasped out, haggard and exhausted. "Fucking- take us with you."

"Please," Lucy pleaded. "I- I need that again."

"Pleeeeease, Roxy?" Akane pleaded. "Can we pleeeeease keep them? I'll feed them and fuck them and take them on Sex Dungeon delves!"

"I'm Level 14, and I only have one open Familiar slot," Roxy said. 

"You- nnnh- came inside me... for three hours," Volex said. "I can... fuck... I can give you, anything you want. I'll give you enough XP to hit Level 15 if you promise to take me and Lucy with you, and I'll throw in literally anything else you want!"

"How about enough XP to hit Level 20?" Roxy asked.

"...Okay, I can't do that," Volex admitted. "Fuck, uh... what's your biggest roadblock right now?"

"Hrm... Well, Incubus has some promise, but we just aren't making enough cum to level it quickly enough," Roxy said, tapping her chin.

"Oh! Hah!" Volex grinned.

"If it is just vast quantities of semen you require," Lucy said. "I think we know what would be perfect for you."

"This," Volex said, pulling a thin square chip from thin air, "is a Slotless Rancher Class Unlock. You get yourself a herd of cowgirls, and before you know it, you'll have more cum than you know what to do with. So, whaddaya say, boss?"

"Do we have a deal?" Lucy asked.

Roxy thought about it carefully. 

"Do it," Lisa said.

"You're so beautiful," Nicky murmured, cradling Lucy's rounded face in her hands.

"They'll take your dick to heaven, cause they're hot as hell," Akane added.

"Yes," Roxy concluded, nodding. "We do. Welcome to the team."