Plans are made and then immediately derailed.

After taking a few more minutes to catch their breath, Twilight and Isaac cuddled up on her bed (after a quick magical cleaning). The urgency of the overall mood had cooled down considerably. Isaac was content to rub and grope her curvy alicorn body, and Twilight was happy stroking both his long cock and her cum-filled belly.

"Sorry if I got a little... bossy back there," Twilight apologized sheepishly, eyes still focused on his cock rather than Isaac's face. "Even I didn't realize how much I needed a cock stuffing my throat until... well, until it was right in front of me."

Isaac let out another chuckle. This was all too surreal! "I don't think any man in my position would complain about being treated to an expert deepthroating. As for me personally, I don't mind ceding the dominant role once in a while - makes things easier for me anyway."

Twilight chuckled back, beaming like all was right in the world. "Haha, that's good to know. Really, it is. If you're going to become our Harem Master, then knowing your preferences and kinks is going to be... paramount..." Her eyes widened and she gasped in alarm. "I never had you fill out a kink list! Oh, where is it, where is that form??" Her horn sparked, and a whole stack of papers appeared next to the bed and levitated into the air in front of her as she scanned them. "No, no, no - come on, where did I put it?! Ack, and you're probably gonna want to fuck all my friends too, I should summon them here and-"

At this point, Isaac was starting to get used to Twilight's... eccentricities. So rather than panicking and freaking out himself, he just put a hand on her bare shoulder. "Twilight. Hey. Slow down. Take a breath."

To his great relief, Twilight actually listened, putting a hand on her ample bust and pushing outward with her exhalation. "...I'm sorry. It's just - I want to make things perfect for you, so that you'll stay and keep being our Master..."

"Well, good news: I'm not going anywhere," Isaac said with a smirk, his hand drifting down to rub her back between her wings. "This is already pretty excellent for me. I've got no shortage of incentives. But, ah, I'm only mortal still, so I'd like to keep things going at my own pace, take things easy for a bit, get used to being the man around town. Isn't having your Master wander around freely, fucking whoever catches his eye, every native creature's idea of the idyllic Harem Master slice-of-life?"

Twilight blushed. "...I didn't realize you had read those stories..."

"It was hard not to notice while I was doing my 'research,'" Isaac teased. He slowly got up out of her bed, pushing past the wall of floating papers Twilight had summoned before standing up, his thick, heavy cock dangling between his legs. "So, if it's alright, I'm gonna head back out and find another one of your friends to fuck. You're more than satisfied for now, right?"

Twilight nodded enthusiastically, rubbing her cumflated belly. "Mmhmm! Yes, that was the cum guzzling I absolutely needed. But..."

Isaac raised an eyebrow. "But?"

"Well, I'd like to ask two small favors from you, if that's okay," Twilight admitted with a bashful smile. "First, maybe... your next stop could be Sugarcube Corner? Pinkie gave me a heads-up that she sensed something big and sexual and life-changing was about to happen, and... well, I think she deserves to know that she was right."

"Pinkie Pie..." Isaac mused aloud, hand on his chin. Admittedly, while the 'Mane Six' were all lovely and charming in their own ways, and any ranking of them was with the thinnest of margins, Pinkie Pie wasn't usually his first pick due to her randomness and boundless energy clashing with his logic-driven thinking and overall lethargy. He'd been initially thinking of visiting Rarity or Applejack or Fluttershy next. But then again, there was no way that a Pinkie Pie encounter would end up boring, either. "Sure, I don't see why not."

"Great! And the second thing..." Twilight then levitated a clipboard with a pen and several pages of a form clipped to it, floating them into Isaac's hands. "Could you... fill out this kink list real quick, so that I can get a good idea of how to use my magic to make things hotter for you?" she asked sheepishly, a deep red blush on her purple cheeks. "Don't worry, I'm not going to treat it as definitive or final - just to get a general sense of what appeals to you."

Isaac sighed wryly, clicked the pen, and started working his way down the form.

Now re-dressed and with a slightly more cramped wrist, Isaac left Twilight's castle and made his way back into town to head towards Sugarcube Corner. Thankfully, he'd walked around the town enough to know its layout well enough. The sweets shop was on a major street anyway, so it was hard to miss amidst all the rustic cottages. Getting there would be pretty straightforward.

At least, that was the plan.

Until a blue rainbow-maned pegasus swooped down and blocked his path.

"HEY!" she yelled at him, a look of deep frustration on her face as she hovered a couple of feet off the ground. "Did you just FUCK Twilight?!"

Isaac, still mid-flinch, wasn't sure how to react, especially with how mad she seemed. "Uhhh..."

She flapped a few feet closer, bearing down on him. Her body wasn't as dramatically endowed as many of the mares in town - though still busty and big-hipped for his world - but she possessed a toned physique from intense workouts that meant she could easily knock him out if she wanted. "You DID, didn't you?! I can smell her on you! Everything about you says, 'I just fucked a mare stupid and I LIKED it!'"

Usually proud of his ability to pick up on context clues, Isaac was left fumbling in the dark. Was she on to him? Was she being protective of her friends? Was she somehow a full lesbian in this warped reality and didn't care about his male appeal? His brain was just not coming up with helpful explanations. "I mean..."

Rainbow Dash hovered even closer until she was right on top of him, hands gripping his shoulders with trembling desperation. "And... and you really did like it, right? You're not a femcolt, powerbottom, or cuckold...? You're just a dude with a cock who wants to fuck, right...??"

Ah, there were the context clues. Instead of answering verbally, Isaac pushed his pants and underwear down to his ankles, freeing his massive cock to the open air.

Dash let out a guttural squeal that was hard to transcribe and dropped out of her hover onto her knees, grabbing his cock roughly and hugging it against her like a body pillow, kissing the top of the base. "Ohmygosh ohmygosh ohmygosh...! I knew it, it doesn't matter that you're an alien, you're a real male with a real cock and- oh fuck, I need this inside me so fucking badly!"

Now this was more like it. Isaac was feeling a bit mischievous due to being so rudely interrupted, though. "You talk a big game, but one whiff of 'real' cock and you become a totally tamed bitch, huh?"

Rainbow's movements became slightly less frantic and slightly more sedate, rubbing her cheek against his cock and breathing the scent of his crotch in deep. "Ohhh yeaaahhh~... I'm yours~...! J-Just please, fuck me, fill me...!"

"Then strip and show me how wet you are."

She obeyed with lightning speed, nearly tearing off everything she was wearing and tossing it aside like it didn't matter. She presented her lean yet firm hindquarters to him, showing off her dripping, swollen pussy lips. "S-See?! I've been needing cock all week! The- The new routines, they've been really stressful! You wouldn't leave a Wonderbolt hanging, would you?!"

Still feeling a bit on the naughty side, Isaac smirked and said, "No wonder. Even for this world, you've got an absolutely massive pussy, don't you?"

Rainbow's stance widened to make room for how big and puffy her fat blue lower lips got. On her slimmer frame, her pussy was almost comically huge, squishing between her thighs and oozing a small waterfall of juices. It also seemed like her hips had widened as well, her lower body and abdomen making extra room for an extra-capacity pussy. There was no way Rainbow could wear anything and not show off an enormous cameltoe from now on. "Ngh... Come on, please...!"

Isaac took a few steps forward, lining up his cock with her juicy folds. "Once I start fucking you, you're gonna cum in seconds and over and over again, like a firecracker, aren't you?"

"J-Just FUCK ME ALREADY!" Rainbow yelled back at him, shaking her hips back and forth insistently. "Fuck... I can feel the heat of your cock... It's got me so close...!!"

That was all the confirmation Isaac needed. He pushed forward, the tip of his massive cock slipping smoothly into her equally massive pussy, her thick lips hugging his shaft as they slid down his cock.

He didn't have control for long, though. "YYYEEESSSSSS!!!" Rainbow Dash immediately pushed back against him, taking to the air a bit and flapping backwards to drive herself further onto his cock as quickly as possible. Isaac ended up stumbling back and falling onto the ground, his cock sticking straight up into the air as Rainbow flapped and fucked herself on it like a flagpole. Her fat pussy clenched and squeezed around his cock, juices flowing down his shaft as she came almost immediately, followed by another spray, then another.

And then there was the screaming.

"FUCK! YES! ISAAC! YES! MASTER! COCK! PLEASE! YES! MORE! FUCK! FUCK!"

Her voice practically echoed through the nearby streets, causing mares and stallions alike to stop what they were doing and crane their necks towards the commotion. Isaac couldn't help but notice that they were now putting on a show, but Rainbow Dash didn't give a fuck as she kept cumming and yelling.

"FUCK ME FUCK ME FUCK ME FUCK ME FUCK ME! YES! YOU'RE SO GOOD! YOU'RE THE MASTER! NO COCK COMES CLOSE! YOU'RE THE ONE! YOU'RE THE COCK! THE COCK! COCK! COCK! YESSSSSS!"

Rainbow descended down his shaft until her pussy was pressed against his crotch, spraying his balls with her fluids while his cock stretched her belly out nearly above her head. Using her wings and her fitness, she repeatedly jumped up and let her body fall back down onto his shaft, fucking him in insanely long strokes while babbling her heart out.

"CUMMING! SO! GOOD! YES! MORE! MAKE ME! BREAK! LOSE! MY MIND! I'M YOURS! WHENEVER! WHEREVER! MY! PUSSY! BELONGS! TO! YOUR COOOOOOOOOOOOOOOCK!!!"

With one final scream of joy, Rainbow fell forward, all strength lost from her body as she descended into a fucked-out stupor, the only remaining activity showing she was alive being her shallow breathing and the continued twitching of her hyper-swollen pussy.

Isaac, for his part, was a bit too overwhelmed to orgasm just yet, though damn if he wasn't close. He couldn't help but notice a more pressing issue, though. The random townsfolk that had overheard Rainbow's orgasmic screaming - who wouldn't? - were slowly approaching from all angles, even above as passing pegasi flapped down to see what was going on. The closer they got, the more they confirmed their suspicions, the more hungry they looked - both mares and subby stallions.

He'd barely gotten three blocks away from Twilight's castle and already a spontaneous orgy was about to break out. One that Isaac didn't yet feel ready for. Maybe supercharging all these creatures' need for dick, his dick in particular, had gotten a little out of hand.

A little out of hand.

Isaac's mind raced to figure out a solution, knowing that he was less than a minute away from all these creatures dogpiling on him and never letting go until he fucked them all. His dick twitched eagerly at the idea, but Isaac knew that his mind and body weren't ready.

The Root of Honesty had gotten him into this mess - surely it could get him out of it?