With brute - more orgasms for all!

If Isaac had been less panicked, he probably could have come up with a solution that de-escalated the situation and would help to keep things relatively under control going forward. (At least, that's what he wanted to believe about himself.) But with a dozen or so ponies closing in around him on all sides, all clearly hoping to be the next in line, Isaac went with the first relatively detailed idea that came to mind.

With his dick still buried in Rainbow Dash's obscenely fat pussy, Isaac looked up to the sky and shut his eyes in concentration. "Is it true that creatures of this world don't feel a need to pile on their Master or potential Master because, uhhh... whenever they sense that he's cumming, or that another potential **** is cumming from pleasure caused by him, they have a sympathetic orgasm that's almost as strong?"

The moment Isaac finished his question, the scene changed instantly. Because retroactively, as soon as Rainbow Dash had started screaming in pleasure, all the other ponies in earshot had become incredibly aroused and soon began cumming on the spot, adding to the chorus of moans. So there was no longer a horde of ponies closing in on him, because for the most part they all remained where they stood, creaming their skirts and pants over and over again in sympathy with Rainbow Dash's firecracker orgasms.

Of course, in his haste, Isaac had failed to realize something at first. That sympathetic pleasure was also pretty clearly caused by him, so the ponies who were out of the initial earshot but could see the first wave of ponies reacting? Well, they experienced a flash of pleasure and started cumming too, a little weaker. Then the ponies that saw them but not the first wave, they came on the spot too, a little less intensely... Oh, and the ponies who were watching each other cum due to him, that only strengthened their own orgasms for a little longer...

Isaac could tell this was happening because he could still hear the moans echoing nearby in town. He was creating a shockwave of orgasmic pleasure amongst the populace, jumping from pony to pony. Hell, even Rainbow Dash was still clenching around his cock from hearing the other ponies moaning in the distance. Thankfully, due to his wording, there were diminishing returns, so it didn't last forever. But it lasted long enough to make him worried on a couple of fronts. Especially as he looked up and saw a couple of pegasi wobbling in the sky from pleasure... and heard the patter of pussy juices 'raining' down from the sky near him.

"Erm... No one in this world ever gets hurt because of the pleasure I cause... or sexual shenanigans in general, right? In this world, excessive sexual fluids evaporate in minutes outside the body, quickly and cleanly, right?"

At this point, broad catch-alls seemed necessary.

And, even though Isaac had yet to realize it, that was a smart choice, because 'pleasure caused by the Master' was going to be far, far more commonplace than he thought.

Earlier today, as Gallus helped Sandbar cum for their sexual homework with a fantasy of the Master, all six of the dormmates had cum in unison - even Yona, despite having gotten eaten out moments before. It was an incredible bonding experience for them.

Yesterday, when Rumble came into his own mouth at the thought of the Master, the entire classroom and the teacher had cum in sympathy. Cheerilee hadn't missed a beat in immediately continuing her lecture.

Every time Celestia and Luna witnessed Isaac cumming, they had a strong orgasm themselves on top of their own pleasure, effectively doubling their exhaustion and satisfaction at the end of their dalliances with him.

As Chrysalis masturbated in her cell at the thought of Isaac corrupting the world and let out her orgasmic squeals, the royal guards at the top of the stairs shuddered and came then and there - though they were trained to remain stone-faced and alert even in the midst of jetting cum onto the floor.

There was no need to explain or provide context in the heat of the moment. All the creatures of the world now had an infallible sixth sense for when an orgasm was derived from the Master.

Long before Isaac had arrived, all throughout history, in every part of the world, 'cum-waves' or 'cum-quakes' were a common phenomenon as ponies invoked fantasies of the true Harem Master to pleasure themselves and their loved ones. The legend they all pined for had ascended from universal sexual fantasy to something approaching god-worship with real, actual blessings.

Fashions across the world instantly changed. Even the fanciest outfits for the highest nobility were often at the very least crotchless, and many common creatures went around bottomless - if not naked, weather permitting. The 'danger' of randomly cumming on the spot was real enough on any given day to make it more comfortable to go without, even if most of the spent fluids cleaned themselves up automatically. Every creature was too used to seeing each other mid-orgasm to feel a great need for modesty.

Eris, watching just about everyone from her chaotic pocket dimension, could always reliably find someone cumming and chanting "Master" to give her a quick buzz of pleasure. Though at this point she was more used to the feeling than most would ever acclimate in their entire lifetimes. That didn't stop her from snapping her fingers and setting especially big 'cum-quakes' into motion like Rube Goldberg machines every now and then, for her own amusement. And why shouldn't she? It wasn't like anyone got hurt in the middle of an orgasm, after all.

Of course, now the 'real' Master had manifested, and everyone was now waiting and watching eagerly for his next orgasm...

"I-Isaac...?"

Rainbow Dash had finally come around, it seemed. Her voice sounded even more raspy and hoarse than usual.

"That was great...! But now... I need you... to pull out... Ngh, I'm gonna cum again, I know it, but I'm gonna try to... keep my mouth shut...!" She lifted her hips slightly and covered her mouth with both hands, probably to prevent another pleasure shockwave.

It turned out to be necessary, because as Isaac started dragging his massive, still-hard cock out of Rainbow's enlarged pussy, the pegasus let out a muffled squeal into her hands as her pussy clenched and let out another small waterfall of juices.

Isaac then realized he hadn't cum yet. Rainbow Dash's screaming and the horde closing in had been such a shock to his system that it had distracted him from his own orgasm. And the feeling of tugging his shaft back while her fat pussy lips hugged him tight trying to keep him in...!

Especially once just the head was still inside her, with her lips clenching and twitching just beneath the crown...!

"Oh fuck...!" Isaac grunted as he felt the invisible line being crossed and his balls beginning to clench.

Rainbow uncovered her mouth and looked back in alarm. "Wait, you hadn't cum yet-?!"

That was all either of them could say before Isaac's cock swelled and started pumping cum directly into Rainbow's massive pussy. Rainbow, feeling her Master cumming, naturally started cumming again too as her rapidly semen-bloating belly began to push her up off the ground.

"YESSSSSS! OH MY GOOOOOOOOOD!!!"

Which, naturally, started the whole chain reaction all over again.