Yang was happy. She was standing outside her home for the first time in a month. She had been away from home on a field trip as part of her studies at Signal academy. The trip was a tour of all four major academies of Remnant. It was a fun trip, she had many trinkets and souvenirs to show Ruby and her dad, but she had been away for a long time. She hoped everything was just as she left it.

Yang opens the door and is startled by a flash of rose petals and a loud "YANG!". Suddenly her sister is squeezing her tightly, a big smile on her face. Yang smiles back at her.

"Hey sis," Yang said brightly "how ya been".

"Yang!" Ruby squealed "it's been so boring without you here. I missed you soo much!"

Ruby babbled on like that until their father, Taiyang, showed up. He looked surprised for a moment but then he embraced both his daughters.

"Welcome home Yang," he started "It's good to have you back. I assume the trip went well."

"Yup," Yang beamed "I even got some souvenirs to show you guys."

"Well then, why don't you get unpacked. Dinner will be ready in about an hour, you can tell us all about your trip then."

Yang carried her bags up to her room. She was busy putting everything in order when she heard a knock on her door. She looked over to see Ruby dressed to go outside and carrying a piece of wood vaguely resembling a scythe.

"Let's fight!" declared Ruby.

"I… What?" sighed Yang.

"Come on. You must have learned something on that trip and if you haven't then I have. Soo let's fight!"

"Ruby, what do you mean? I just got back, can't training wait till later."

"Nope!" And before she could say anything else Ruby was leading Yang into the woods nearby their house.

The two of them found a clearing in which to spar. They squared off, Ruby with her "scythe" and Yang with her fists. The fight was over quickly with the blonde warrior winning easily. In fact, it was over so easy that Yang grew suspicious.

"Ruby, what's this really about? I've been fighting you for years you can-"

She was cut off as the red-haired girl kissed her quickly on the lips.

"Oh!" Yang now understood what her baby sister was after. "Ruby, I know we've fooled around in the past but…" Yang had indeed learned something on her trip. She had learned that all the other girls saw her as a "country girl" and she wasn't all too keen on feeding that stereotype even more. Besides, it was wrong. "... we really shouldn't do that anymore."

Ruby looked into her sister's purple eyes and kissed her again, deeper this time. Ruby pulled back and grinned mischievously before ripping open Yang's shirt, buttons and zippers flying everywhere.

"Ruby stop we-" but she wasn't listening. Ruby admired Yang's large breasts, sitting proudly in an orange bra.

"Oh my! What big boobs you have. Have they gotten even bigger since the last time I saw them?"

Yang was in a difficult situation. Her back to a tree and being felt up by her baby sister. She wanted to push the smaller girl away and forget this ever happened but that wouldn't be fair to Ruby. She must have been waiting for this the whole time she was gone. The young huntress supposed she could let Ruby have her fun for now, plus despite her doubts, her sister's attention did feel nice.

Ruby undid her big sister's bra. Yang's huge tits tumbled free shining in the evening light. Her nipples were large and puffy. Yang let out a sigh of relief. Ruby cupped the large melons in her hands.

"Wow! These things must have been so cramped in there all day." She began to massage the hanging breasts. Yang moaned softly "Yeah I bet that feels good. I can't believe you tried to stop me." The hooded girl continues to massage and play with her sister's boobs for a few minutes. She started to suck on Yang's nipples which quickly hardened in her mouth.

"Okay Ruby you've had your fun but we should really-" Yang was cut off again but not by a kiss this time. Yang was simply dumbstruck by what her little sister was doing to her. Ruby had moved up from her sister's jugs and was now licking Yang's armpit. She was using her tongue to lick up all the sweat that had built up during the day.

"Ohmygod what are you… where did you… I didn't know you were this kinky Ruby."

Ruby paused for a moment "Oh don't you worry sister o' mine soon enough you'll be just as perverted as me." She followed this up with a long, slow lick of the yellow girl's armpit.

Yang wondered what exactly had happened to her innocent baby sister. What caused her to become this… pervert. More importantly, what did she mean Yang was going to end up like her.

Yang was going to speak again when Ruby started to kiss her. It was a long sloppy kiss, Yang could taste her own sweat on her sister's tongue. It was gross but even still the blonde-haired beauty was getting turned on. Ruby eventually ended the kiss and started to work on Yang's other pit. Her tongue tickled slightly but it felt nice in a weird way. Yang slowly sank to the ground as her partner continued to lick and suck the sweat off her armpit.

Yang was content to let Ruby do whatever she wanted. She didn't even stop her when she started to pull her shorts down, the older sister simply raised her hips. Ruby, for her part, went straight to work licking and sucking Yang's wet pussy. The red-haired girl stuck her tongue deep inside her sister and sucked hard her clit. Yang moaned and wiggled as she felt her orgasm building.

"Oh fuck yes Ruby! Oh god, I'm gonna come! Keep going aAAHHH!" Yang came hard providing her baby sister with loads of girlcum which she happily slurped down. "Whew… Alright, Ruby thank you. I can return the favor later but now we've really gotta-"

Ruby stood up giggling and Yang saw her turn into a tornado of red and rose petals briefly before her baby sister was proudly standing before in nothing but her boots and her hood. The girl's cute, little nipples were hard and her cock was even harder. Ruby's dick was above average, she wasn't the only one who grew, and it looked even bigger on such a small frame.

"Oh no Ruby listen to me we can't-" Yang was cut off by the cock slamming down her throat. Her throat gagged in a desperate attempt for air and to remove to long, hard object lodged in it. Unfortunately, all this achieved was a small grin from Ruby.

"Sorry to have to cut you off sis but I reeally wasn't in the mood for another excuse. Why don't you just sit back and relax this shouldn't take tooo long." Ruby winked at her big sister.

And so Yang did wait. She had struggled a bit at first, she tried to push her sister off but that just made the next thrust even stronger. Resigned to her fate Yang thought about she had got to this point. Her she was being face-fucked by her baby sister and what was she doing? Just waiting. She could easily push Ruby off and go home but she hasn't. She gagged again and again Ruby just laughed and shoved her cock deeper down Yang's throat. Yang thought that she must be a terrible sister. She should never have let it come to this. She really was becoming a pervert. The kind of girl who lets their little sister use her as a fleshlight.

Yang's cheeks burned from the humiliation and, to her dismay, from her arousal.

"Alright, Yang I've just about got your present ready." Ruby slammed her dick into her sister's throat one last time before she pulled out and started to jerk off in front of her face. Yang watched as her partner's hard shaft twitched and throbbed. A glob of precum and saliva fell onto her face. Ruby unleashed a throaty moan as she erupted all over her sister's pretty face. Cum got all over Yang her face, her tits, and even her long golden hair was coated in her baby sister's thick, white jizz.

Yang looked up at Ruby and asked: "Are you satisfied now?"

"Nope!" Ruby beamed her silver eyes flashing with ill intent "But if it makes you feel better that felt great. Now then it's time for you to get to work paying me back."

"Pay you back?! What the hell was all that then!?" Yang exclaimed cum dripping down her chin.

"Like I said that was a gift. A sign of love from one sister to another. Now enough questions. I assume you know what to do." As she said that last part Ruby raised her arms exposing her armpits to her elder sister. They were hairy and drenched in sweat from all the fucking she just did. Her armpits reeked so much that Yang thought she must not have washed them in a week at least. "I've been saving these bad girls just for you ever since you left," Ruby said proudly

"Ruby… I'm not gonna…" Yang didn't know what to do. She thought this must be a dream, a really really weird dream. Her little sister was waving her smelly armpits in her face. They smelled so bad but at the same time, they smelled distinctly like Ruby. The stench of her baby sister was filling her nose, it was all she could think about. Maybe it was her sisterly instincts but was kinda starting to like the smell. She unconsciously took a deep breath. The odor was so intense but Yang couldn't stop her self from wanting more.

Ruby watched as her big, strong sister stared at her armpits. Ruby grinned as she saw her big tits heave up and down as she took deeper and deeper breaths. Her grin grew even wider as she saw Yang's pussy start to drip. The younger sister had been waiting for this moment for so long. Now she would finally have her own pitslave, her own strong, beautiful pitslave.

"Go on, one lick couldn't hurt," she said knowing full well it wouldn't stop there.

Yang nodded slowly and moved her face even closer to Ruby's pit. She could see the individual hairs and each bead of sweat. She could feel it calling to hear the stench drawing her in. She stuck her tongue out and gave it one long lick. Yang's tongue caught a month's worth of sweat and filth. It tasted horrific. It burned her tongue and she was half-tempted to throw up. However, after her initial revulsion, Yang started to notice the subtle flavor hidden underneath. It tasted salty, the texture was slimy and wet, she noticed she had caught several hairs on accident. But most of all it tasted like Ruby. Yang could feel the essence of her baby sister filling her mouth and as she swallowed she felt her in her whole body. Yang swelled with sisterly affection and her arousal grew to match. Yang began to eagerly eat out her sister's armpit.

Ruby grew horny as well watching her older sister slurping on her filthy armpit. She knew she had gained a loyal slave for the rest of her life. She also knew she would never need to wash her pits again. Ruby entertained herself by playing with Yang's hanging boobs. They swayed side to side as she batted them back and forth.

"You know Yang you look a lot more like a cow like this, on all fours licking my pit. You even have big udders down here just like a cow. My little pitslave cow."

Yang wanted to argue, to say that she wasn't a cow or a pitslave. She was just returning a favor. Yang knew that wasn't true, not anymore. She couldn't even stop herself from cleaning her little sister's sweaty, dirty armpit. On top of all that, Yang didn't want Ruby to stop she wanted her to keep tell how much of a cow she was, a perverted failure of a big sister. All she could say as she moved to her baby sister's other reeking, hairy armpit is "Yes Mistress"

Ruby giggled "And you called me the perverted one. What kind of big sister licks her sister's sweaty pits and takes any abuse thrown at her? A slutty, pitslave of a big sister that's what."

They went on like that, Ruby teasing her sister and Yang eating it all up until finally both of Ruby's armpits were spotless. Both of the girls were beyond horny by now with Ruby's cock jumping and oozing precum and Yang's pussy dripping her juices.

"Okay pitslave only one more thing for you to do."

"Yes Mistress, anything you want."

"I want you to lay on your back, in the dirt, cow and beg me to fuck you."

Yang immediately laid down and spread her legs. She began to beg "Yes, oh yes please Mistress please fuck my wet cunt."

"Oh, are you sure? We might be late for dinner…" Ruby teased.

"Please pleeaase fuck me I'm sorry I'm such a terrible pitslut of sister. I won't ever tell you what to do again. Just please give me your hard cock."

"Hmmm… Good Enough!"

Ruby lined up her cock with her sister's soaked pussy and pushed inside. Yang felt tight around her cock but she was so dripping wet it didn't matter. Ruby began to thrust in and out.

Yang was ecstatic. Her Mistress's cock felt better than anything she'd had before. Her pussy was on fire as her sister slid back and forth. Yang moaned loudly as she was filled with dick over and over again stretching her cunt to its limits.

Ruby used her semblance to build an inhuman amount of speed which she used to plow her sister into another realm of pleasure. She watched as the blonde girl's eyes rolled back in her head as she whispered "Mistress Ruby" over and over. Ruby's cock began to twitch as she neared her second climax. As it did "Mistress" Ruby got an idea.

Yang came back to reality slowly and she realized she was still being fucked slowly by her sister. "What's going on Mistress?"

"It's nothing my dear cow I'm just about to cum in you."

Somewhere in her head, pitslave Yang thought that cumming in her pussy was a bad idea. The problem is she couldn't remember why. Why is that a bad thing? "O-okay Mistress…" she muttered.

Ruby was enjoying the look of confusion on her sister's face. She was gonna enjoy cumming in her wet cunt even more. "You sure you've got nothing to say? No protests, no nagging, not even a 'please don't'. I guess I really did scramble your brains if you're not worried about getting pregnant."

That was it! She didn't want to get pregnant! Right? As her Mistress stirred her pussy up a bit faster she wasn't sure anymore. Would it really be so bad? She'd get to raise her Mistress's child and she'd get to be close to Ruby all the time too. But wait didn't she want to do something else with her life. That's right! She was going to be a huntress! She couldn't have a baby now! "Ruby wait don-"

Ruby spurted all her sticky cream deep into her sister's womb. She had been waiting for Yang to speak up, of course. Just to deny her one last time.

Yang, on the other hand, couldn't respond as she was cumming harder than she ever had before. She screamed and moaned as her little sister filled her to the brim with semen. Eventually, she had collected herself enough to weakly ask "Why?"

Ruby laughed "What's a cow without milk?" She stood up and used Yang's hair to wipe her cock off. She then put her clothes on in another red blur. "Welp it's good to have you back sis. See ya later pitslave."

Yang watched her sister walk off towards their house. She then looked at herself. Her armpits were still wet with spit. Her tits were coated in jizz and sore from being swatted around. She could feel a mixture of semen, sweat, and saliva dripping from her face. Most of all, her pussy was full of cum and dripping. She looked at her tattered clothes on the ground covered in dirt. She looked at the sky. Yang was happy.