Stubbornly

"Ignore my sister, please. Serial masturbation has left her brain-damaged." Said the blonde demon.

"I didn't agree to shit!" Sly protested. Though it seemed to be ignored by the sisters.

"Kek, you fell for Mel's lies, Sly."

"Do not address me by that name! And I've said no lies."

"That 'will become a monstrosity without equal' is not placed after we give anon the god juice, but after he grinds like a dipshit."

"I had but a few moments to deliver the offer, some information was to be inevitably lost."

"Liar, liar, pants on fire!"

"You insufferable...! Deep breaths, Melanoche, deep breaths. Let me illustrate the situation to you, our champion. The world of Ruyanei has been the place of struggle between Light and Dark...

"Anime JRPG fantasy world where the monsters were about to win, but then the glowing cocksuckers of Light cheated, and made every hero OP. The Demon King is dead and the monsters have been beaten back. So we're cheating too."

"You neglected to mention that they somehow gained the knowledge to kickstart mankind's technology. But yes, they cheated. And now, we will retaliate: another Demon King is on the rise, we've bolstered the reproductive rates of this monster generation, created as many dungeons on human land as we could, and last but not least, our trump card: you."

How the fuck is she talking like that?

Melanoche continued. "You see, Dark, our domain, bestows power immediately but plateaus after a while. This is the reason why the immensely powerful Demon Kings get defeated by Heroes. The powers bestowed by Light start off weak, but grow almost without limit.

Your human soul belongs to Light, and that is what we are going to exploit. We shall make you a monster, but one that can evolve beyond any other by defeating the spawn of men.

So as to not overwhelm the light of your soul, and render this all but moot, you will start as a creature of middling power.

But then...oh ho ho ho...but then..."

Her freaky sister rolled her eyes. "And she calls me a serial masturbator. Anyway! Let's start customizing your body. We could put you into a normal monster, but since your soul is such a special snowflake I'm going to make you into a special snowflake monster."

"Wait!" Sly exclaimed, finally breaking through to the bickering siblings. "Now, I am D.T.F. when it's fun but I'm no fucking ****. You say you have seen my fantasies. What is my biggest kink?"

"Anal! Your dick in some tight shit-hole. Not great fr a breeder but..." Mel rambled before Sly cut her off again.

"Not that one! Keep looking!"

"Oh, enthusiastic... Consent... Meh. That can change. Besides, there's no turning back now."

So Sly played along, keeping his form as close to his original body as possible. He selected a powerful core and a hobgoblin body, leaving him taller and more powerfully built without feeling too off. To the annoyance of the demon sisters.

He spent an eternity on most the perfect reproductive package he could conceive. Sly drew the lusty demons into his project, explaining in great detail how he could use the equipment. He came out with a heady cloud of pheromones, a thick, veiny cock that shoots just slightly inhuman sized loads and zeroed out the refractory period. His cum, would be his secret weapon. Potent enough to breed the barren, pumped full of bonding hormones and a chemical cocktail to make bearing and raising young much easier and a taste of purest nectar. The demons were put off by the lack of spikes, knots and tentacles. The whole thing being a bit too nice for their tastes but even they acknowledged the effectiveness. Sly kept the sisters close as he perfected his cock, keeping them swimming in his pheromone musk as he made tiny alterations.

Now somewhat distracted by their dripping cunts and the fantasies placed so neatly in their heads, Sly wheedled a Life elemental infusion out of the girls on top of the Time-fruit juice. Mel even thought it was her idea.

With three classes to pick he grabbed Sorcerer, Ranger and Knight without much hesitation. The Pro-Gamer HUD cheat swiftly followed. Now finished with the demons the gave him a mighty shove and...