It had gotten a little later in the day since Rainbow Dash, now known by her new name Rainbow Blitz, had brought his friends over to "check out" his new piece of equipment he was packing down there.

And check it out they did. Very thoroughly.

It felt like for the next hour or so, the two girls had spent the whole time with their lips and tongues on his shaft, kissing and licking it all over, giving the new stallion his 50th blowjob of the day.

It probably was, in all honesty; he had long since lost count by this point.

And needless to say, he was enjoying himself with this newfound power of his. So long as he didn't let it go to his head, he'd be putting it to good use.

The only problem with that, of course, was that this was still Rainbow Dash on the inside. Still the reckless, arrogant tomboy that used her head for a much different sense than the Alicorn she had come here to find in the first place.

And speaking of, that thought still hadn't left his mind yet.

The next Daring Do book was still delayed, and he still needed to find Twilight for the solution to this problem. Surely, she'd know what to do... At least, he hoped so.

"Hey, girls..." Blitz began, the two girls sitting down beside him, their eyes still showing the same entranced state.

Both girls looked up, their attention directed to the male.

As much fun as he was having with them like this, intensified by his newfound hormones, it was kinda boring. They really weren't putting in much emotion to their words anymore.

Sure, they had their moments, but not enough to satiate his need for entertainment.

All the more reason to find Twilight; if anypony would know how to modify this potion's effects, it would be her... Or maybe Zecora, but he was better off sticking with Twilight for the time being.

"Play with each other for a while." Blitz continued, making his way outside the room. "Come and find me later, I'm gonna look for Twilight. If she comes in here, stop whatever you're doing and tell her I need to see her."

"Yes, sir." Both mares replied in unison.

With that, the Pegasus stallion exited the room, leaving the two slaves to pleasure each other, which he knew would continue for a while, even after he had found his friend.

"Okay, Twilight... Where are you?" The tomboy-turn-actual-boy muttered, looking around the corridors, hoping for the Alicorn to suddenly appear.

As much as he loved his friends, their lack of personality and individuality at the moment was a bit off-putting, despite how great they were for his sexual needs.

Then, out of the blue, a door in the corridor leading to one of the handful of libraries opened, and a familiar purple pony began to step out, carrying a small stack of books in her arms.

Quietly gasping, Rainbow Blitz immediately unfurled his wings and charged towards the Alicorn, sending him flying backwards into the library she was just about to come out of.

Dropping the books from getting tackled, Twilight was quick to gather herself and turn her attention up to the pony that had just pinned her down.

"Whoa, Rainbow Dash!? What's the big hur-!"

Before she could finish the question, the cyan Pegasus quickly got up on his hands and knees, looking down at the egghead below him and allowing her to see his current state.

Seeing his more toned face, bigger eyebrows, bulging muscles and, most importantly, the feeling of the giant cock hanging between his legs, making its presence known

"Whoa, Rainbow... W- What happened?" She asked, her cheeks flushing red at the sight, but not out of embarrassment or disgust. It was more out the feeling of his new little pride showing itself off to the mare intrusively.

She had a million questions right now, but she knew it was best to try and keep calm, starting with the easy ones.

"Uh... H- Hey, Twi..." He responded, letting her get a load of his new gruff voice. "Um, yeah... I- It's me, Rainbow... Dash. Uh... I- I was hoping you could help me with a problem..."

"I'll say..." The Alicorn commented, feeling his package once again.

For some reason, even though she couldn't see it, she could already imagine its shape, and almost feel it's pulsating aura and its warmth.

The compromising position of him being on top of her like this didn't help her situation, either.

"Twilight?"

Blinking rapidly, the princess quickly snapped herself out of her stupor, looking back up to him, a nervous smile on her face.

"Sorry, I didn't mean to- Sorry... Um... Could you... Get off me, please?" She asked, not wanting to sound rude or forceful.

"Oh, uh... Yeah. Sorry." He apologised, standing up from her and getting off the floor.

Following his example, the mare did the same, dusting herself off and taking a better look at his new body.

"So, um... How did this happen?" She inquired, trying to maintain most of her eyes' focus on his face, rather than the rest of his impressive new body.

The purple pony never really gave much thought to stallions before, regardless if they were sweet, strong, cool, smart or whatever their biggest positive trait was, but now...

Rainbow Dash sighed, looking guilty about his reasoning. "I was looking for you. Found your vial in one of the rooms and drank it. Don't ask why, 'cause I can't... Really tell ya."

This response got her attention, and she was quick to take a guess. "In hindsight, I probably should've put it away before leaving... That was an experiment I was working on, after getting the recipe and ingredients from Zecora last week. You were pretty reckless about this, Rainbow Dash."

"Yeah, yeah..." He shrugged, waving his hand dismissively at the scolding. "So, what happened to me, and what happens now?"

Clearing her throat, Twilight began to answer the question. 

"That vial was a Reanatomising formula, measured at 63% of its desired potency." The intellectual equine explained, sounding like she was about to give one of her excessively long lectures about the liquid. "When it comes into contact with the DNA, it will reshape the subject's body and rewrite the genetic-"

"So, what does it mean for me?" Blitz interrupted, not caring for the details.

Sighing, the Alicorn continued.

"Well, from what I can tell, the R63 potion worked as it was intended, but wasn't ready for testing yet, resulting in the risk of an unexpected side-effect."

This made the Pegasus raise an eyebrow, pulling down the front of his shorts to flash his illuminesant cock to the nerd.

"You mean THIS side-effect!?" He asked, crudely showing off his new piece of meat.

Twilight was about to respond, but stopped herself, a blank expression on her face as her eyes expanded at the hypnotic sight, the bright colour and size of his erection, not to mention the glow, making it hard for her to resist its call.

Blitz quickly took notice how she was unable to tear her eyes away from it, and smirked.

"What, like what you see?" He teased, his ego beginning to inflate at seeing her so mesmerised by his new tool.

But unlike the previous two, it seemed this new toy was eager to be played with; Twilight was already playing with herself through her skirt, biting her lower lip and her breathing becoming heavy.

"Ooohhh... Yes..." She moaned, her gaze not breaking from his shaft.

It was something tk name note of, how she was already getting so turned on by the sight of his dick, and he wasn't planning on wasting it.

"Yeah, you like that?" The former mare grinned, bringing his new piece of man meat closer to her. "Already teasing yourself before I said anything~"

"Yes, mistress..." She purred, the scent wafting into her nostrils, her body tingling and the need to play with her snatch growing stronger and stronger.

But once she spoke, Blitz duddenly remembered part of the reason why he had come to find the egghead in the first place.

"Okay, Twilight..." He began, grabbing her by the shoulder and forcing her down on her knees, his member now mere inches away from her face. "Tell me what else this thing can make ponies do."

***

Blitz's day was getting better by the hour. First, he gets a massive horse dong, then he learns it can make ponies obey his every word, and now he just discovered its hidden potential.

After Twilight debriefed him about how to make it work, it was only a matter of seconds before they had returned to the matter at hand.

"Alright, Egghead~" He began, standing on a table and presenting his rock-hard cock to his latest acquisition to his little harem. "You want some of this, don't cha?"

Normally, the Alicorn would've likely responded either nervously about engaging in a little role-playing, being unfamiliar with this kind of nature, or blunt about the brash nature of his question.

However, she wasn't herself right now; Blitz made sure of that.

So instead, the purple mare placed her hands to her cheeks and gasped loudly, giving his shaft a giddy look like an excited schoolgirl.

"OMC!" She exclaimed, moving her hands down to her tits to tease herself a little. "Like, I'd totes love some of your cock, big RB! It's, like, sooo hot! Totally, like, the biggest and hottest dong I've ever seen!"

'Oh Celestia, yes~' The stallion thought to himself, finding the incredible display of changed personality and behaviour more arousing than it was hilarious.

She had become the complete opposite of who she used to be, and if that wasn't proof that this magic had worked, then what else would be?

Not just in mannerisms, either. As quickly but neatly as she could, she was also sent to "girlify" herself a bit, wearing her clothes a bit more scantily, doing her makeup and messing her hair a little, giving her more of the look of a kind of mare she wouldn't really want loitering around the castle looking for a stallion to give a good time to.

"Mmmm... Alright, baby. Get those lips moving and show me where you belong." He ordered, pressing his shaft to her snout.

Taking a deep whiff of his manmeat, the bimbofied princess took hold of the shaft and pressed her lips to it, planting kiss after kiss all over the throbbing rod.

"Mwah! Mwah mwah mwah mwah mwah mwah! Oh Celestia, yous is a total stud, Blitz!" She announced in a bubbly manner, continuing her lip & tongue technique on his powerful rod of control.

"Oohhh... Yeah... Ohhh..." Blitz groaned, feeling the wonderful sensation of his shaft getting peppered in the lipstick kisses, watching as his slave got her face coated in a mixture of her own saliva and the natural oils of his dick.

It was such a sexy sight to behold, seeing her acting so unlike herself. Easily better than the boring, blunt way the first two were responding, that's for sure.

The Alicorn was normally the smartest pony he knew, but now, she had become the most ditzy, bubbly and air-headed girl he had ever laid eyes on, and there was nothing more pleasing to his mind than seeing the results of his experiment.

"Ahhh... Yeah, just like that." He purred, watching her move her mouth to the tip of his cock and take the head inside, feeling her cheeks starting to bulge out already.

As soon as his dick entered her mouth, the princess moaned loudly, the vibrations causing some pleasure for the stallion as well.

'Man... This is so much better than I thought...' Blitz thought, letting out a pleasured sigh while Twilight went to work on him. 'I wonder if she's done some "research" on this kinda thing?'

His thoughts were cut off by a sharp gasp, the sensation of his member being squeezed and squished by the mare's lips, the feeling of his head being engulfed in the warm wetness of her curious tongue.

"Ahhhhh!"

"Mmmmmm..." The Alicorn moaned, moving her mouth up and down his rod, the juices and saliva dripping down onto the floor.

The stallion felt a shudder of pleasure surge through his body, and couldn't help but smile at how eager his newest slave was to please her master.

And please him she did.

"Ahhh... Oh, yeah..." He sighed, watching as the bimbofied mare slurped and licked his shaft, feeling it pulse and throb, as she tried to deepthroat his dick as best she could.

From the way she was working him like this, it wasn't going to take him long to blow his load, and he was going to enjoy every second of it.

"Oh, man... Ooooohhh..."

Feeling a warm swelling sensation in his balls, he grabbed her head and held it in place, the tip of his cock barely touching the entrance of her throat.

And then, without giving her any verbal warning, his new bollocks let her get acquainted with their contents, squeezing and pushing out his fluids and shooting them down her gullet.

"Ghhhgghhh... Ugggghhhhhh..." She gagged, struggling to swallow the fluids, the warm gooey substance coating her mouth and filling it to the brim.

She was having a much harder time taking his load than he was giving it, as they could both tell by the difference in how their bodies were responding to his first orgasm of their session.

Still, despite how generous her new favorite meatstick was being with her, the princess took the gallons of spunk like a champ, swallowing down a good majority of the wave.

Moments later, he had finally finished cumming, his shaft slipping out of her mouth, leaving a small trail of jizz on her face.

Panting, he took a step back, admiring the sight before him.

"Man, Twi, that was awesome~" He complimented, a satisfied smirk on his face.

Hers wasn't any less happy; she lit up with glee at the praise of her work, looking thirsty for more of that glorious man-nectar.

"Thx, Blitzie!" She smiled, her eyes sparkling and her face lighting up. "Anything for my stud~"

The stallion could already imagine the look on her face if she ever caught wind of what his cock could really do, and the danger of such a thing happening only made this more exhilarating for him.

But that wasn't a concern he needed to worry about right now. Not when the two of them wanted more action together.

'Celestia, she looks so damn good!' The libido-driven voices in his mind exclaimed, filling his still-hard boner with the need to plough this horny Alicorn like there was no tomorrow. 'She's just begging for it! She wants you! Now, go! GO! Take her!'

Not wasting any time, the Pegasus stallion got off the table and grabbed the mare, almost throwing her to the edge of the sturdy wooden structure and bending her over to get her head down on top of it.

As soon as she was in position, he took his place behind her and practically ripped her skirt and panties off her body with his bare hands, admiring her tight little pussy and winking pucker.

It wasn't anything spectacular, especially compared with AJ and Rarity from a while ago, but definitely not anything to complain about.

Blitz wasted no time in lining himself up with the dripping snatch at his disposal, aiming his saliva-drenched rod at the wet entrance, ready to make himself at home inside the ditzy know-it-all.

"Okay, Twilight..." He began, a devilish smile on his face as he got himself ready. "You asked for it, and now you're gonna get it~"

"O- Oh Celly, yes~!" His formerly smart friend replied, spreading her legs a little more for easier access. "Like, I wanna be used like the filthy who-!"

She didn't even get the chance to finish her request, before she found herself feeling like she was being pulled apart at the crotch area, letting out a blissful scream of ecstasy.

"Ahhhhhhhhhhhh! Oh Celestia, yeah~!" She hollered, the feeling of having her cunt stuffed with horse dick sending her into a sexual frenzy. "AHHHHHH! YES! YESSS!"

She certainly was boisterous, in this state. But who cares? As long as the two of them were having the time of their lives, what business was it of anyone else's?

As for Blitz, his own grunts and moans of pleasure might have been drowned out when measured next to Twilight's, but they were still present.

She was pretty tight, and definitely a virgin. Not too surprising, considering how often she spent her time in her castle, and that made it all the better. More special, and more satisfying too, in a way.

Once he was sure he hit her hymen, he pulled back a little, before ramming back inside her like a common strumpet, repeating the process like a pumping car piston.

He didn't waste any time on trying to ease her into things, instead going all-out from the get-go.

With every thrust, his cock drove itself into her, his balls swinging back and forth with the motion and slapping against her body, and his hands firmly gripping her hips as they went at it like a pair of horny high-schoolers.

Though they wouldn't stay there long.

Both of them were hornier than they had ever been in their lives, both of them because of the potion's effects in one way or another, and it was clear they craved more than the already intense sex they were having so brashly right here.

With that in mind, Blitz's right hand wound itself back, before suddenly coming down on her ass and slapping it.

"Ahhh!" Twilight screamed, her face blushing red as the pleasure and pain rushed through her, the handprint visible and a faint outline of his palm & fingers on her cheek.

"You liked that, huh!?" He announced, bringing his hand back and doing the same again on the same spot, watching the other side of her rump ripple with every slap.

"YES! YESSSS! I TOTES LOVE IT!" She answered, feeling this sense of sexual bliss ascend to an even higher plane than the one her master took it to already.

She wanted it rough, and she was going to get it rough.

The spanking continued, leaving a swelling red mark on the princess's backside, looking painful enough to make anypony else who saw it wince a little at the thought of how much it must've hurt.

But he had other plans for her butt, too.

After he was done striking her buttcheek for a moment, he reclaimed his grip on her hip with his right hand, and the left quickly made its way over his hammering shaft, where her secondary hole was just aching for attention.

His index and middle fingers stuck out together, and with no hesitation whatsoever, they were quickly pushed inside the anus, earning a shrill gasp from his bimbofied marefriend.

"Ahhhh! OMFC, YESSSSS!" She screamed, lolling her tongue out in pure bliss for the feeling of anal penetration.

Before today, Rainbow Dash/Blitz wouldn't have dared even dreamed that anypony like Twilight Sparkle, the Princess of Friendship of all ponies, would have experimented with her anal passage in any kind of way.

But now, it was like her whole personality was a complete 180, and she was a completely different pony altogether.

That wasn't to say he wasn't enjoying it too. His fingers probed her thoroughly, getting every nook and cranny they could reach in their limited space. But it was clear this was a three-man job.

So, after just a few more seconds, his ring finger joined the crew in the mines of Alicorn anus, exploring the dirty tunnel to their owner's heart's content.

"A- Aaaahhh... Ahhhhh..." She moaned, a bit muffled, as she could only keep her tongue hanging out and her eyes rolling back, her expression showing her satisfaction.

They wiggled and wriggled around for a bit more, before putting out the call for their foreman to join them in the job zone.

Sure enough, the forth and final finger on the hand joined in, and a few seconds later, his entire hand was now inside her arse, stretching her hole as much as it could.

'Yeah, this is a pretty big stretch... Better save that for a while.' The Pegasus thought, feeling the hole getting stretched by his fingers.

Getting pounded by a long, hard cock and her anus being fully fisted wasn't something Twilight would've expected to happen in her lifetime, she would've had to admit, but who was she to think about anything right now? She had a strapping stallion plowing into her to do all the thinking for her.

"Mmmff... Oohhhh... Yesss, Blitzie... Yessssss..." The purple Alicorn purred, her mind clouded by the feeling of his hand and cock in her, making her forget about her title, her duties, her friends... Everything, but her master and his wonderful cock.

It wasn't long before the two of them could feel their big finish building up inside them, and neither of them wanted to wait much longer.

"Oohhh... Oooooohhhh..." Blitz groaned, his shaft continuing to slam into her with no mercy, his hand staying put as best he could make it, while he could feel his dick pulsing.

Time was running out for the two of them, and he had an idea of how to finish things up.

Quickly and rashly, the Pegasus pulled his whole hand out of her stretched anus, giving the Alicorn a sudden shock of empty pleasure, making this heavenly feeling even better than it was.

And right after it was free, he brought it up to his snout and gave it a huge whiff through his nose, inhaling her rectum's scent like it was the freshest air.

"Oohhhh..." He sighed, and feeling the final straw being placed before he blew his load.

Twilight was the same way; getting his whole hand suddenly pulled out of her tailhole like that was unbelievably amazing, and was what it took to make her reach her climax too.

His member was twitching and throbbing inside her, the mare's cunt was tightening around him, giving both of them the signal that they had reached the incredible climax.

Sure enough, Blitz's spunk suddenly burst out, filling her womb with his sperm, the warmth coating her insides and shooting her over the edge.

"AAAAAHHHHHHHH!!" Both of them screamed out, the biggest and best (and in Twilight's case, the first) orgasm of their lives wrecking their minds and bodies, sharing this moment of dirty passion like the world was about to end.

"Ohhh... Ohhhhhhh..." Twilight panted, feeling the semen gushing out of her and staining the floor, a few drops splattering onto her weakening, wobbly legs.

Feeling himself coming down from the sexual high, the Pegasus stallion pulled his dick out of the mare's cunt, a few last strands of cum spurting out of his shaft and landing on the ground.

Once he was out of her, Twilight collapsed to the floor, getting part of her clothes messy in the process.

"Whoa, Twi..." He exclaimed, moving over and trying to help the mare to her feet again.

"I'm fine, Blitzie..." She panted, a happy look on her face. "Like... Celestia, that was... Soooo nice~"

"Glad you enjoyed it, Twi." The Pegasus smiled, patting her on the back. "Now, what say you and I-!"

Before he could finish the suggestion, the door to their temporary sex den opened up, prompting the Pegasus to turn his attention to whoever was interrupting them, a due sense of panic clear on his face.

However, his fears were quickly alleviated when they were met with the sight of his other two slaves.

Without seeming any different from before, Applejack and Rarity entered the room, apparently completely oblivious to whatever had just happened in here.

"We've returned, master." Rarity stated, standing still in front of the stallion.

"We're ready fer new instructions, sir." Applejack added, doing the same.

Blitz smirked at this, before an idea came to his mind.

"Rarity, Applejack... Stay where you are." He announced, placing a hand on both of their shoulders as she turned her attention to the third of her increasing collection. "Twilight here needs to show you two how to behave around me~"

Despite her semi-conscious state, the Alicorn acknowledged her name being mentioned and what it was that her master was implying, subtly nodding at the command.

"I'm gonna go find our other friends." He continued, making his way out of the room. "When she's done teaching you girls your new personalities, make sure to reward her the same way you played with each other. Got it?"

"Yes, sir." The pair of them replied in unison, leaving the stallion to smile wickedly.

His fun wasn't done yet.