ROYAL REWARD: Butt-Based Bet Timeline 1, Part 3 (Absorption, Inanimate TF, RWBY)

Ruby’s clothes rustled as she tossed them to the floor. 

“Are you sure about this, Ruby?” said Yang, one eyebrow raised in concern. “Once we do this, it’s gonna last for a while. It’s not like I can just turn you back.” 

Ruby giggled. “I’ll be fiiiiine,” she said. “Weiss seems like she’s having a great time.” 

Yang frowned. “I don’t know if I’d say that,” she said. “It sounds to me like she hates it.” 

From the bathroom came a high-pitched scream of disgust. 

Ruby unclasped her bra with a smile. “Yes, but Weiss loves to complain. I bet she’s enjoying it really. Besides,” she added, giving her sister a smug look, “you said you wanted a butt like Blake’s, didn’t you? Well, how else are you going to get one?” 

Yang blushed. “I guess that’s true,” she said. She had thought of convincing Jaune to jump into her rear, but the thought of letting that nerd anyway near her private parts was too much of a turn-off.

“It’s settled then,” said Ruby, tossing her panties with a giggle. “Have you got the Dust ready?” 

“Yeah, it’s all here,” said Yang, popping the cork of the vial. “Here.” She passed it to her sister. 

Ruby raised the vial to her nose and sniffed. “It’s got a strong scent! It almost smells like lavender.” 

“Whenever you’re ready, sis,” said Yang, dropping her panties too. Turning around, she leaned on her bed and stuck her ass in the air, just waiting for its new addition. 

Ruby raised the vial of Dust over her head and took one deep breath, clearly steadying her nerves. Finally, she tipped the vial. Dust, bright pink, rained down on her in a shower of sparkles. She closed her eyes and let it sink into her skin, shivering and biting her lip to keep herself from moaning. 

It wasn’t long before it took effect: soon, her body started to look a little runny. Like a candle, she started to drip. She stood there, staring at herself in surprise as her fingers ran down her arm. 

“Any time, Rubes,” said Yang. “If you end up a puddle, I’m not cleaning you up.” 

With a nod, Ruby hurried forward and dropped to her knees with a squelch. Planting her hands on her sister’s ass, she pressed hard and– 

She needed haven’t bothered: it was like placing her hands in water. In an instant, she vanished up to her elbows, and in her surprise she shot forward. Her head struck Yang’s ass with a squelch of molten flesh, and a squeal escaped her lips as her entire world turned upside down. For an instant, she barreled through a tunnel of dark flesh, her body as liquid as her surroundings. 

And then, just like that, she was looking up at the ceiling of their dorm room again, just like normal. Except her entire body felt strangely thick and flabby and divided, of course, as if she’d stuffed herself full of dough… and then been cut in half. She tried to move, but all she achieved was making herself jiggle a little. She felt so heavy it was absurd. “Um, Yang.” Miraculously, she’d retained her powers of speech. “Yang?” 

“Holy Dust.” The cliffside Ruby was hanging from jerked, bouncing her up and down as it marched across the room towards the mirror on the wall. As Yang walked, Ruby’s cheeks clapped loudly against each other, shaking her brain in her skull (or wherever her mind was now) and striking her with little pangs of pleasure, too good to resist. She moaned even as she flushed red with embarrassment. 

At last, Yang came to a stop. Ruby continued to bounce for several further seconds, but eventually her jiggling ceased, and her eyes stopped spinning in their sockets long enough for her to get a decent look at herself. 

In the mirror stood the fattest ass she’d ever seen. It was at least as large as Blake’s with Weiss in it, if not larger. She looked like she could fill a whole couch, let alone a chair. 

“You–you added way more than I expected,” said Yang, struggling to hide her lust. 

Ruby took a moment to respond. “I guess it was all those cookies,” she said. 

For several seconds, the two of them simply stood in silence, marveling at the sight of Ruby’s egregious new form. 

Then Yang reached back and, before Ruby even had time to protest, dug her fingers deep into her fat new cheeks. Pleasure, overwhelming, ripped through Ruby’s mind and left her mewling in delight. As Yang forced her hands in deeper, forcing thick folds of fat up and around her fingers, Ruby squealed in delight, losing herself to ecstasy of being touched. Her entire body felt so impossibly erogenous, she couldn’t believe it. If being squeezed was this good, what would–?

“Yang, sit on me,” she cried, struggling to hide her desperation. “Sit on me!” 

“Okay, okay!” cried Yang. Biting her lip, she hurried back over to the bed and paused for a second, wiggling Ruby from side to side as if unsure whether or not to go through with it. 

“Yang!” 

“Okay!” with a sigh, Yang dropped. 

The instant her face crashed into the mattress, impossible, mind-wrecking pleasure roared through Ruby’s new form and left her screaming for release. As the weight of Yang’s body crushed her jiggly new rear beneath her, flattening Ruby’s thick new form from a pair of spheres into something considerably more ovoid, ecstasy surged through her transformed body, filling her halves like a pair of balloons and stretching her mind so taut with pleasure she could only scream for more. “Yang!” she cried, voice muffled by the bedclothes. “Harder! Harder!” 

“Harder…?” Swallowing, Yang bit her lip and, after a moment of thought, started to bounce on the bed. Ruby screamed, her voice and her pleasure growing greater and greater with each little impact until at last– 

Ruby screamed as she came, and Yang followed suit a second later as the pleasure of her ass reached her. With a moan, she lay back on the bed, naked and sweaty and panting, her ass still squished and mewling beneath her. 

The door creaked; Blake stepped in. “Hey, Yang, have you seen… Ruby…?”