[Contains stuffing, minor weight gain, and sexual content]

The night was getting late as Team RWBY celebrated Yang's 18th birthday. Yang had managed to convince the rest of the team to come out to a bar with her, even though it wasn't really their thing. Ruby was only 15, so she couldn't drink, and Blake and Weiss, despite both being 18, weren't really into drinking. Yang, on the other hand, was drinking enough to cover for the lot of them. She normally went for cute fruity drinks, but this time she decided to go for some beer. She wasn't a huge fan of the taste, but she loved how heavily it sat in her gut and how it bloated her up, along with all the bar food she was stuffing herself with. She hadn't told anyone about how much she enjoyed stuffing and growing her belly, but that didn't matter, she was getting the chance to indulge tonight.

As the night went on, her belly went from its flat and toned normal appearance to a rounded, tight ball of a belly. It wasn't huge, only just getting big enough to hang out past her belt, but it was getting good. Unfortunately, that was right as it was starting to get too late.

"Hey, Yang, I don't wanna be rude, but it's getting pretty late, do you mind if I head back?" Ruby asked cautiously.

"Wha-? Oh, yeah, go ahead Ruby!" Yang quickly. "Uh, Blake, do you wanna go with her, make sure she gets back safe?"

"Sure," Blake answered. Yang got the feeling that Blake was waiting for that question all night.

"I take it that means I'll be your chaperone for the night," Weiss said after farewelling the other half of the team.

"Yeah, but I don't think it's gonna be much longer," Yang reassured, before very unreassuringly ordering a pitcher of beer for herself, a big mug for Weiss, and a bowl each of ribs and wings. "I'm just gonna power through this, then I should be good for the night," Yang said. It seemed odd, but Weiss thought she had an inkling of what Yang had planned.

Over the next half an hour, the pair worked their way through their food and booze. Weiss' belly filled enough that it loosened the sash around her waist by itself as it pushed out, filling with beer and food. It ended up large enough to match where Yang started this last binge, but Yang definitely didn't stay at that size. Yang had far more beer and took far more food than Weiss, not that Weiss was complaining, and her belly ballooned quickly. Yang drank and drank and ate and ate, rubbing her growing, bloating belly all the while. By the end of that little binge, her belly was as large and round as a basketball, and just as firm. Yang shoved her belt down as far as it would go without slipping off and she popped open the buttons of her jacket, all to give her belly the space it needed. This left her belly on full display, fully exposed, and that sent a shiver up Yang's spine.

With that last binge done, the girls made their way out of the bar and off towards the bullheads back up to Beacon. The large amount of beer that Yang finished off started to hit her, so she was leaning on Weiss for support, putting an arm around Weiss' shoulders and using her other hand to cradle her full, sloshy belly.

"Hey, Weiss? Thanks for staying out with me tonight. I wanted to get nice and full before I went back, y'know, as a little birthday present to myself," Yang said slowly, slurring her words a little bit.

"O-oh? Is that so?" Weiss replied, her cheeks going red and her eyes going wide, knowing that her hunch might have been right.

"Yeah. Oh, uh, can you keep a secret?" Yang whispered conspiratorially.

"Of course."

"Well, here's a big secret for ya. I love bellies on anyone, me, cute girls, handsome guys, everyone. They just get me so horny, ya know?" Yang revealed.

"I-I see," Weiss commented, trying not to let anything slip out, something Yang clearly wasn't concerned with.

"So, like, when we get back, I'm gonna need to use the bathroom for some Yang time, if you know what I mean," Yang drawled, a lecherous grin on her lips.

When the pair got to the bullhead station, Yang flopped down onto the first seat she could find, slouching, spreading her legs and hanging her arms over the back. Her head rolled back as she let out a satisfied hum.

"Hey, Weissy, can you rub my tummy?" Yang asked in a cutesy voice. Without a word, Weiss reached over and carefully rubbed Yang's belly. It felt so warm to the touch, and the skin was so taut, it was an unusual experience for Weiss, but not one that she was entirely opposed to. "Mmm, thanks Snow Angel," Yang cooed as she flung one of her arms up and over Weiss' shoulders. She then leant in and placed a big, clumsy kiss on Weiss' cheek. When Yang leant back, Weiss had gone bright red, freezing in place. Weiss would have needed a much stronger word than 'flustered' to describe how she felt right now. On the bright side, however, it gave her an idea for Yang's next birthday.

It was early on Yang's 19th birthday, and Yang awoke to find a cake on one of the dorm room's desks. Next to it was a little note from Weiss.

Yang,

This cake is all for you. I've taken Ruby and Blake out to 'prepare a surprise for you', but I doubt you'll enjoy that surprise as much as you'll enjoy a few hours alone with a cake.

Weiss

Yang looked back up at the cake. It was all for her? It was so large, larger than her torso, which may not have been the greatest of achievements for someone as slim and athletic as Yang, but still, it was a lot of cake. It was also so luxurious, with generous amounts of chocolate frosting, cream, and icing. No matter what, it was going to fill Yang up very nicely. She silently thanked her past self for drunkenly blabbering about her fetishes to Weiss before a thought came to her mind.

"A few hours alone, eh?" she mused as she reached for her belt.

About an hour later, Yang was slouched in her seat, stuffed to the brim, completely naked, and horny out of her mind. Her belly ached just right for Yang as it rested on her lap, not from fat but from sheer size and weight. She was licking the last of the chocolate frosting off of her fingers before wiping anything left off on a napkin Weiss had left for her. All cleaned up, Yang now had something else to deal with.

One hand stayed up on her belly, rubbing soothing circles on the lap-filling ball, while her other one slipped down between her thighs, feeling the heat emanating from Yang's eager core. Yang didn't waste time with foreplay, she hardly felt like she needed it, so she dove her fingers in between her lower lips. A throaty moan spilled out as Yang's quick fingers began searching her inner walls for her most sensitive spots. As soon as she found them, she worked those spots as hard as she could, pumping her fingers in and out as quickly as she could. It took mere moments for her hips to begin to buck on their own, while bolts of pleasure raced through her body. Her toes curled and her muscles tensed in anticipation, while panting breaths mixed with desperate moans of pleasure. Before Yang knew it, she was coming, and coming hard. A deep, guttural moan poured forth from Yang's mouth, making this orgasm sound like more than just a bit of pleasure, but also like it was something Yang urgently needed. She had never had an orgasm so powerful, so fulfilling, so incredible. Had she not already been sitting down she likely would have collapsed as her whole body went loose and relaxed. Deep breaths made Yang's bosom heave as she drew in air. She never expected an orgasm to feel so exhausting, but she did have an extra 10kg of cake in her gut to deal with, so it made sense.

Once she had caught her breath and cleaned up, she was still feeling a little bit naughty. While it might have been her birthday, she still felt like giving Weiss a little something in return. She grabbed out her scroll and sat back down to pose for the camera. She used her free hand to cover up her breasts, while letting just a hint of nip slip out. She took about a dozen pictures, wanting to get this just right, before sending the perfect one to Weiss with the caption 'thanks for the present'. It wasn't long before Yang got a response.

Weiss: YOU ALMOST GAVE ME A HEART ATTACK!

Yang: ~Like what you saw?~ 3

Weiss: You absolute meathead

Yang: ~That wasn't a nooo~

Yang set her scroll aside after that. After all, she had a belly to enjoy and she wanted to enjoy it as much as she could before the rest of the team got back.

It was the night of Yang's 20th birthday and her and Weiss had been spending it together in a hotel. They had started dating not long after Yang's last birthday, with Weiss admitting her shared appreciation for bellies with Yang. At first it was just Weiss appreciating Yang's belly, but in time Weiss tried out stuffing herself and found herself enjoying it far more than she expected. With the two of them enjoying it together, they indulged themselves much more often than they used to, with Yang's birthday being the biggest indulgence they ever had.

Both of them had bellies stuffed to the absolute brim with cake, both looking so big it was as if they were both nine months pregnant, although Yang did just slightly outdo Weiss. Both of them were completely nude, their slightly softer bodies on full display, showing off all of the effects of their gluttony and hedonism. There wasn't much of a change yet, the most noticeable changes being that Weiss was a little wider at the hips and Yang having plumper breasts and posterior, but it was very apparent to the lustful couple.

The couple were both rolling their hips to each other as they sat on the floor, core to core, sharing a double-ended dildo that they pumped up and down on. They both panted and moaned as they heaved their heavier bodies, forcing them to keep moving. They watched each other with hungry eyes, their hands roaming where they could as they worked towards their orgasms.

"Ooh, this is dangerously good," Weiss moaned, "I could get addicted to this."

"Too… ah… too late for me! I thought getting fa-ah… fat would stop me, but I love m-my fat ass and fat tits," Yang declared.

"Mmf, and these hips feel so nice when you grab them," Weiss added.

"As soon as we graduate, I'm getting huge!" Yang announced emphatically.

"W-we're getting huge t-together!" Weiss corrected, her voice high pitched and laboured as she worked through her pleasure. She barely got it out before her back arched, her toes curled, and she threw her head back, letting out a hell of an orgasmic moan. She flopped down onto her back, writhing and moaning in pleasure as she came hard. Yang came very shortly after, moaning even louder but not completely collapsing, her strong body holding itself up as her muscles tensed.

The couple came together for a little while before their bodies slowly eased off the pleasure. They both extracted the dildo and caught their breath for a moment, their heaving chests hungry for air. Yang recovered first, so she scooped Weiss up and gently deposited her onto the room's bed, before snuggling in next to her. They held each other as closely as they could, while working around their full, cumbersome bellies.

"I can't believe I'm saying this, but I'm glad I told you what kind of weirdo pervert I am," Yang quietly admitted.

"And I'm glad I let you corrupt me with your perversions," Weiss added.

"Speaking of that," Yang inquired, "when you said you wanted to get huge with me… how big were you thinking?"

"As big as an active huntsman can be. I don't want this time at Beacon to go to waste after all," Weiss explained.

"Heh, of course you've got more restraint than me," Yang teased. "Here I was planning to just go as big as I can without immobilising myself."

"Well, I look forward to you being my big, beautiful trophy wife waiting for me when I get home," Weiss cooed as she rubbed Yang's belly. The couple leant in to each other, locking lips and sealing in their big future together.

[AN: Happy Birthday to Yang Xiao Long! I know it's a little late, but I've been focused on other stuff, so I kinda forgot about this.

Oh, also, to make the ages work for this, I'm assuming the Beacon school year starts around January/February, like it does here in New Zealand, except it starts in Summer here while it seems like it'd start in Winter in Vale.]