[Bunnyboy TF, Genderswap]

“Aaahhhh… It’s so boring around here…”

One young man finds himself wandering around the halls of Chaldea. A youth by the name of Astolfo. Pink-haired, femininely framed, and absolutely mad inside that little head of his. At least, that’s one way to look at him. Considering the way that he treats his fellow Servants, it wouldn’t be too wrong either.

While a lot of the heroes from the past that came together to save the incinerated Human History were goodhearted, they were not exactly social in that sense. Unlike the pink-haired Paladin, who was the very model of social spunk. If he saw somebody that tried to hide away, he’d strike up a good talk and get them roped into some sort of scheme just to make them open up. And while that was a good thing for many, there were plenty that found themselves frustrated with him.

That was why he was currently stuck all on his own. To make matters worse, he was currently summoned in his Saber form, which meant that he was wearing a cute leotard meant for bunny boys. And yet here he was, without anybody to admire it.

“Why’re they all trying to avoid me?” Astolfo asked aloud, tapping his chin for a few moments as several memories started to play through his head. Each of them ending in his cock springing out of his leotard and the others ending up crowding around it for one reason or another.

Could it be because he easily became the center of attention? The size of his cock? His cute form? There were a lot of options, and trying to take them all into account was giving him a headache.

The pink-haired bunny boy stretched a little before casually materializing a grail in his hand. One of the grails that were supposed to make him stronger, according to his Master, but he just liked having them around in case he ever needed a drink. Of course if he ever bothered to realize the power he held in his hands, he’d probably hesitate to use them in such a mundane fashion.

“I wish they’d be just as open as me, so we could all have some fun.”

Magic slowly boomed forth from the golden cup, with Astolfo no less aware of what he had just set in motion…

---

“Aaaannneeee!”

The changes had swept through Chaldea at such a brisk pace that some of the Servants had already been affected. Those that were closest to the boy’s own mindset, or at least his physical appearance, were the furthest along.

Such was the case for Mary Read, the short pirate girl who wore an outfit that was almost identical to the one that the boy wore. Which meant that in the middle of her usual daily routine, she was surprised to find something long, hard and thick between her thighs that wasn’t just her favorite sword.

“Mmmhm, Mary-” Anne Bonny, her much bigger and bustier blonde companion, poked her head out of the shower to try and figure out why her little spunky friend was making such a loud noise.

In that moment, she found herself pinned down to the ground, with the white-haired bunny girl sitting on top of her stomach, cock throbbing against her leotard. There was a frenzied look in her eyes, one that couldn’t just be tamed by words.

“M-Mary?” Anne raised an eyebrow as she looked at the girl sitting on top of her. Only for her mind to forcibly rewire itself thanks to the grail’s magic. No, that wasn’t a girl. That was her best buddy, Mar! Silly Anne…

Mar licked his lips as he started to gyrate his hips back and forth, forcing his cock to slip out from its tight prison. “I wanna fuuuuck, Anne!” The newly converted bunny boy, who even grew a nice fang to replicate the look of the boy who had set all of this in motion, plopped his fat rod down on his best bud’s equally fat tits. “Lemme fuuuuck!”

The boy’s needy cries were strong, and thanks to her mind being altered to see all of this as a common occurrence, it didn’t bother the blonde pirate even a little bit. In fact, it almost excited her to see him like this.

Anne watched him thrust with wild abandon. Back and forth. Back and forth. Rubbing that massive length up against her huge cleavage, the two practically made for one another.

As her arousal grew and her attention focused entirely on that cock, she became less and less aware of her breasts growing smaller and smaller. Why should she be focusing on them when she could be focusing on just how good it all felt to be rubbed up against like this?

Both of the pirates were letting out moans in tandem, even as Anne became less and less female. Sure, she was staying feminine, but the wish on the grail was very clear. Everyone needed to be as open as Astolfo.

The pleasure in her body slowly pushed through her, changing every little bit of her looks. Whether it was making her hair shorter so it fit the aesthetic that the bunny boy was imparting upon her, or making her pirate’s outfit just as revealing and as leotard-based as the bunny’s own…

Or forcing her feminine slit to push outward until an equally fat cock took its place with a wet ‘PLOP’, the tip of his brand new cock smashing against the ground before it erected itself into the air.

Just the sensation of growing this cock was enough to snap the girl into a new mindset. Andy was giggling like the mad little lad that he was, his flat chest serving as the perfect way to arouse his best bud.

Andy and Mar let out moan after moan after moan as they climbed higher and higher through the rungs of arousal, until the white-haired bunny couldn’t handle any longer.

Mar thrust forward and let the contents of his balls flow out with great intensity, absolutely covering the blonde bun’s face in his fertile yet wasteful cum. All while he was getting rained down upon by the cum pouring forth from the blonde boy’s fully erect cock.

As the two stared straight into each others’ eyes, both covered by plenty of cum, they couldn’t help themselves as they immediately started to grind against one another again. Whether it was Andy’s flat chest, or Mar’s fat butt.

The two pirates, just as inseparable now as when they were girls, were going to be at this for the entire night…

---

While it was natural that those that already were close to Astolfo in terms of attire were easy to convert, those that weren’t suppose to be self-aware were just as easily affected by the Holy Grail’s wish.

“Hold still, Kotaro. It’s not going to hurt.”

This was the case for Kato Danzo, who was pinning her-now-his charge, Fuma Kotaro, to the ground. Because he needed to make sure that his boy was as healthy as he could be.

For Kotaro, this was bad news. For one, he held Danzo in rather high regard. The karakuri-style automaton had been his guardian for an extended period of time, and to see her like this…

Well, he didn’t exactly appreciate the sight of his maternal caretaker twisted into the form of a lewd boy that wanted nothing more than to play with him. Just seeing that was enough to make the redheaded Assassin struggle against his hold. Not that he got anywhere, thanks to Danzo’s mechanical strength.

“I thought I told you to hold still, Kotaro. Don’t you want to feel good?” Danzo asked as his tongue started to extend. Because of his inhuman form, it was easy for him to manipulate himself. And that wasn’t even getting into his special techniques, one of which was currently revving up as he lowered his lips towards the boy’s throbbing and trapped cock.

Kotaro trembled as he tried his best to avoid thinking about the twisted version of his caretaker. She was not the same person that he had grown up with. But the more he tried to keep her from slipping from his mind, the more the lewd boy version forced its way in. Memories of nursing from his cock and letting him train his rod over and over...

The second his guard started to slip a little, he was forced to let out a powerful moan. And in that very same moment, his cock snapped its way out of its prison, putting the red tip up against the robotic ninja’s lips.

Danzo giggled a little as he wrapped his lips right around the rod and let himself sink as deep down as he could go, until he was kissing the base of the boy’s crotch. And once he was sure that he had all of that meat nicely secured inside his throat, he quietly did a hand sign.

His throat whirred to life as it began to spin. The wet and sticky texture of his mouth quickly spun around the boy’s rod as it edged him deeper and deeper towards a climax. Without even giving him a chance to struggle against this extremely literal vacuum blowjob. To think that his caretaker could use his ninja techniques for something this shamefully erotic..!

Kotaro let out a powerful cry as he was forced to climax right then and there. And with that climax, the power of the grail washed over him, forcing his attire to change to the same sort of bunny leotard that everyone else in Chaldea was wearing at this point.

Danzo lifted his head off his charge’s cock and smiled. “You’re improving, Kotaro. Now, let’s try the other end. Bend over.” He said with a gleam in his robotic eye, his own cock throbbing as it started to piston back and forth rather powerfully.

With his mind deteriorating into pure pleasure, Kotaro could do nothing but obey as he lifted his ass into the air, ready to ‘train’ some more.

---

“Astolfooooo!”

While most of the Servants in Chaldea had fallen prey to the effects of the absentminded wish that the pink-haired bunny boy had made, there were a few that managed to escape its influence.

“Oh, hey, Bradamante!”

As the pink-haired boy swiveled around to meet the blonde girl who always found a way to get involved in paladin affairs, he was quick to notice her ass heading straight for his face.

“You thought you could get away with turning everyone into boys and not telling me anything about it?!” Bradamante cried out as she started to grind her fat ass up against the pink-haired boy’s face. “You know what I’m going to do to you to make up for it?”

With that fat ass on his face, it was hard for Astolfo to answer. “Fuck me?” He tried replying, not really bothered because damn, that ass was perfect.

“Yes! But you’re going to be taking!” The twin-tailed fat-assed girl cried out as she lifted herself off him for a split second…

Allowing him to notice that she was hardly a girl, given the fat rod hanging between his thighs. The reality of the matter was, he had been affected by the wish… But he just didn’t get affected by the mental aspects, thanks to his own lack of intellect.

Astolfo briefly licked his lips in anticipation before that thick shaft was forced down his throat, his pal’s cock slamming him senseless in a matter of moments. Both because his hips were smashing against his head, but because that fat sack of nuts was beating him senseless.

Not that it mattered too much. In the end, Astolfo had gotten exactly what he wanted. He was having a lot of fun, and people were very open about their new sexual desires. Why should he think that was a bad thing, when everyone was clearly enjoying it?

Ah yes. Even as he became his friend’s cock-swallowing slut, he was happy. And who knows, maybe they’d get Master involved too! Of course, that had to be after he was done swallowing Bradamante’s cum, and after they got ahold of everyone else.

Master could use a harem of cock-addicted bunny boys like him and the others...