[Bimbofication, Semi-Twinning]

"Guess I'm Santa now, ehe. Maybe you should've accepted your role as Santa earlier, Nightingale, or I wouldn't have to do this to you and Master!"

Astolfo, as chipper as ever and feeling extra powerful thanks to his new status as 'Santa', giggled as he gazed upon his two captives. His Master, Gudao, was not sure if he should be struggling physically or just trying to talk his servant out of it. And the other, the Santa that didn't rise to the occasion, was Nightingale. Who simply stared forward with a plain look on her face as always.

"Santas aren't bunnies, Astolfo." Nightingale remarked. Frankly, she never should've even been considered to be Santa. But thanks to the other Santa Servants forcing it upon her, she had been trying her best to fight back against the bunny to make sure he didn't claim the title. An effort that was in vain, as the bunny just overpowered her thanks to his superior skills with a blade and simply being too loony to properly read. It made it terribly difficult to aim and hit him with her syringes...

"Nightingale's right, Astolfo. So you should just give the Santa Power back, okay? We'll all be Santa together instead, and make all the kids smile." Gudao tried to follow Nightingale's lead. She was trying to talk sense into him, hopefully it'd work. Not that he expected it to. Astolfo's Evaporation of Sanity skill was at its strongest when he was a Saber, hence why he was dressed like a bunny...

Astolfo tapped his chin a little, actually seeming to consider the offer that his Master gave him. "Hmmmm. Hhhhhmmmmmmm." He hummed and hawed as he tiptoed back and forth, really letting that idea dwell on his mind. Should he give it the time of day? Should he let the Master take away his status as Santa? "But what if I'm actually the best Santa, Master? What then?" He asked, almost innocently so. Of course he'd think he was the best. His lack of sanity was shining through.

"Then... Then we'll have you be Santa next year! Let's just put an end to all of this so there'll be no more fighting. Okay?" This promise would definitely come back to haunt him. He was sure of it. He was so, so sure of it. Astolfo had a way of turning his words back on him, and this was practically loaded with failure from the word go!

Nightingale cast a single glance towards her Master, knowing that what he was promising was a true fool's errand. But beyond that, she said nothing. She merely remained quiet, watching Astolfo carefully. As strong as his blade was, able to keep both her and Master bound, it was thankfully not damaging. So she just had to wait-

"But I wanna be Santa now! And I know the best present for eeeveryone!"

Astolfo ended up taking the bratty route, as he decided to go against his Master's wishes. Especially so as he suddenly leapt, like the bunny that he was at heart, towards Nightingale with his lips puckered. He was going to prove it to his Master. He was going to prove that he had the best idea!

Nightingale didn't flinch as she was very rudely kissed straight on the lips by the hopping bunny. If anything, she just rolled her eyes a bit. The texture of his lips made her acutely aware of what imperfections were present on the boy's body, so she'd have to sign him up for treatment... later..?

"H-Haah... W-What's this heat..?" A red flush started to fill the nurse's cheeks, gasping and panting as the red hue spread all across her face. It was like that heat was consuming her in a matter of mere moments...

Gudao didn't like what he was seeing. "A-Astolfo, what did you do?" He asked, trying to remain calm. It was hard to do so. Beyond difficult. But he certainly tried. All because he had to understand what his Servant had done to the Nurse. If he had managed to do something terrible, then he definitely needed to use his Command Seals quickly. Otherwise...

"Ssssh, Master! Just watch, she'll be sooooo cute in a moment! And filled with Christmas Joy and Hops and Heat and all that good stuff!" The less-than-sane 'Santa' Astolfo giggled as he rubbed his hands together, gently hopping in place. All while he felt a little heat going through his own body, one that caused him to giggle in turn. He couldn't wait to see how Nightingale would handle a taste of what he was going through!

Nightingale was panting rapidly as her conservative Santa costume quickly shifted into a fur-lined bunny girl's costume. The warm fur was perfect for the winter times, as it kept her warm despite the revealing attire. All while giving a good look at her meaty thighs, and her surprisingly big bust. She was really packing a pair of melons, and she never really acknowledged it.

But both the boys that were watching did. Gudao knew that his Servant had been a little ignorant of her feminine wiles. But now that they were on full display... H-He shouldn't really be staring at them, especially when she wasn't able to fully control herself. But he just couldn't look away. She was far, far too hot like this. If she was hopping just like Astolfo, then he wouldn't be able to stop his pants from tenting...

"Ehehe! You're looking like a cute bunny, Nightingale!" Astolfo giggled, hopping in place and bringing a bit of emphasis to the bulge that was pushing out against his own outfit. Maybe it was less his sanity that had evaporated, and more his inhibitions. "Hop, hop, hop to it!"

"Hop..?" Nightingale let the word leave her lips. It felt right to say it. Even if it also felt wrong at the same time. She had a feeling she shouldn't be doing what the word was telling her to do. And yet she also felt like she should be giving it her all... She should... Yes, she should... hop..!

Nightingale, clad in that cute furred bunny girl costume, started hopping. Unaware of the bunny ears that started to pop out of her head. Unaware of the cute tail wriggling right above her butt. Unaware of anything, except the heat between her thighs and the really nice feeling that came with hopping. She just wanted to hop and hop and hop all day, ehehe..!

Her neutral expression was being erased, replaced with a gleeful grin as the bunny was unleashed. Something that was all the more obvious as her hair started to turn the same shade of pink as Astolfo's. It was like she was just as bunny-like as Santa... She was one of Santa's giggly bimbunnies, that's it! Of course, how could she have been so hopping stupid? Ehehehe!

The moment she realized what was going on, it was almost like you could hear something clicking inside her head, and realization dawning on her face. She was absolutely ecstatic to realize her role, as she hopped and hopped and hopped! Boobies bouncing, asscheeks clapping, all while she kept on giggling more and more!

Gudao watched in mild horror as his Servant was made into a completely obedient bunny. One with barely any smarts in between her ears. The fact Astolfo could accomplish something like this from nothing more than a kiss... He had to be stopped. Otherwise... What was he going to do? He... He had to stop him. He had to make him stop before he'd think of doing it to anybody else.

"A-Astolfo, I command-"

Gudao didn't get that far, before Astolfo kissed him on the lips as well. A big, loving, long-lasting and kinda tongue-filled kiss... One that left Gudao with a pair of extra tented pants...

"Ehe. Sorry, Master! I shouldn't have left you out! Here, why don't you start hopping too?" Astolfo giggled, as he pulled back and made sure to undo the bindings that he had made with his blade. All so he could see his Master start hopping just the same as Nightingale had!

Gudao trembled a little as he felt the heat sinking through him, barely able to notice his Mystic Code getting corrupted into the same sort of revealing bunny girl outfit as the one Nightingale wore. Of course, his was a lot tighter to compensate for the fact that he wasn't a girl. Especially down below, it was extra tight around his bulge...

The bouncy bunny bulge between his thighs was really distracting too. Just thinking of it was enough to make Gudao almost tip over. That was how good it felt. He wanted to reach down and play with it and sink his hands into it. Because it was sooo hot. He wanted to touch it and rub it and play with it and feel it up and do all sorts of things to it. But...

Astolfo had told him to hop, ehehe... Maybe he really should hop... N-No, he wasn't a bunny... He wasn't a bunny, right..?

Gudao gasped and panted as he tried to fight against the influence inside him. Fighting back against the need to be a good bun that knew to hop hop and hop. But it was hard! It was really hard! Just like Astolfo's bulge! Which was hopping lots and lots, and it was so distracting...

Drool started to pour down Gudao's chin as his hair started to turn the same shade of pink as Astolfo's hair. What was he doing again? It was like he was forgetting something important. He was sure of that much. Buuuut... What was it again..? Mmmm...

The pink-haired bunny reached down and touched his bulge, and started to idly rock back and forth. He had to do something besides this. He could tell that much. There was this squeaky voice inside his mind that was telling him things. But he couldn't really make it out due to how hot he was feeling, and how much of a haze was inside his mind. What did he have to do again? He had to... Had to... Mmmm...

Gudao's eyes widened as he heard a pop go off inside his mind, and he rapidly started giggling. Of course. Of course! How silly of him, he had been sooo silly. He should be hopping! He should be hop, hop, hopping! Like a good bimbunny! Boybunny? Bimboibun? Eh, whatever!

Astolfo giggled as he watched his Master start hopping just like Nightingale. Just like a good Bimbunny should. Left in heat, with all that nice Christmas Spirit inside them! Or was it just horniness? Astolfo wasn't quite sure, and he wasn't really keen on finding out. Because he was already incredibly happy with this, it was something that made him extra giggly.

Seeing the big-boobied nurse and the fat-bulged boy bounce up and down like this made him extra horny, his own bulge growing nice and thick in response. "Okaaaay, come and give Santa a gift!" He chimed, as he snapped his fingers to make the two horny Bimbunnies listen to him. He knew that a snap would work, it always worked!

Indeed, both Nightingale and Gudao listened to what he said, as they hopped over to him and got down on their knees. All so they could press their faces up against his bulge and kiss it, like the obedient bunnies that they were. There were absolutely no thoughts left inside their heads, at least none that didn't revolve around being bouncy Bimbunnies. That was what they were meant to be, that's what the heat inside them told them!

Astolfo giggled as they kept on kissing him. He knew that he was the best Santa. And he knew he had the best plan in mind for them. Now, he just had to make all of Chaldea see too, and then it would be an extra white and sticky Christmas, ehehe!

Oh, they were going to have so much hopping fun, once everyone was just as horny as he was!