Ruby calmly opened the door to her dorm, letting out a long, satisfied breath. Thanks to Yang's… pep talk, she'd resolved herself to get stronger so she wouldn't lose so easily in the future; her defeat at the hands of the White Fang had opened her silver eyes that she had a long way to go, but Yang had been the one to tell her to do something about it. As a result of that, she'd trained harder than she ever had before.
Ruby had always been a prodigy. That's why she was in Beacon to begin with; skills with a blade came naturally, but they clearly couldn't quite compete with the real world just yet. Ruby had always trained hard, but she'd pushed herself even harder today. Seeing as running wouldn't accomplish much considering her Semblance, she doubled down on her combat skills, which could always be better; she needed to wait for Yang to do some serious unarmed training, but today was pure endurance.
Extra effort came with extra exhaustion. Ruby was beat, and decided that her shower could wait; warm water might feel nice on her aching body, but laying in bed sounded so, so much better. After taking the arduous last steps towards her bed, Ruby collapsed onto her pillow. She felt the coolness of her bed touch her exposed skin, an unfamiliar feeling considering her normal outfit; as she'd been working out extra super hard, she was wearing a loose shirt, a sports bra, and some shorts.
Now reminded of her clothing choice, Ruby's mind wandered. She suddenly felt ugly; while Weiss, Blake, and especially Yang wore tank tops and sports bras when exercising, she was still shy about exposing anything. Ruby lacked the confidence to go out in just a sports bra, and her shorts were far more in line with something Jaune would wear during a workout as opposed to barely covering her butt. Nothing Ruby was wearing accentuated her figure at all, and instead hid it away; even though she had developed a woman's body since starting school, she was still shy and felt underdeveloped. Especially because of… well…
Ruby thought about Yang. To her– to everyone– she was a woman. Yang Xiao Long had a body and knew what to do with it; her usual outfit was suggestive enough, but her sports gear, wow. The blonde preferred a cropped sports bra that had twice as much cleavage as her favorite shirt, and her workout shorts were what she wore underneath her normal pants, leaving nothing to the imagination.
Suddenly frustrated, Ruby flipped over and sat up. Looking down at her lack of cleavage, she grew more annoyed at her own shyness. She grabbed the bottom hem of her shirt and ripped it over her head, leaving her in a conservative red sports bra; Ruby blushed at the sight of her bare stomach, as she rarely saw it in general, let alone when lazing around. It was still far less than her sister, but it made Ruby feel… warmer. Looking at the door, she looked at her ugly, baggy athletic shorts. With a quick bounce, she slipped them off; their loose fit made them fly easily off her hips, proving they hid her figure.
Ruby laid back in her bed, wearing only a step above her bra and panties. In fact, she was in her panties, but her boyshorts were the sort of thing Yang went out in every day. For all intents and purposes, Ruby was rocking her sister's style, minus a massive amount of cleavage but keeping the tight fit; though Yang was far bustier, the late-bloomer had a healthy c-cup hidden beneath the corset she wore everyday. Ruby's former fears about her knock-knees had long side faded since she developed hips that gave her an astounding hourglass figure, but that still didn't help the comparisons. Ruby Rose was a full-figured woman with big, bouncy breasts and a plump rear, but she suffered from both shyness and an inferiority complex; after all, Yang was her older sister, and she'd developed far, far earlier.
Ruby's thoughts grew clouded as she thought about the times she looked in the mirror before a shower. More than once, she had spent time trying to pose in her bra and panties to make herself feel as pretty as Yang, but it only made her feel embarrassed. Still, she had far more self-confidence than when she first got to Beacon; her bust size tripling over the course of a few years certainly helped, for one. Suddenly a bit redder, Ruby realized the room was empty, but there was still a sound; she heard the hum of the shower, so someone was back. Guessing at schedules, Yang was currently naked only a few feet from her.
Ruby thought about Yang. She mainly focused on her earlier thoughts, the ones all about Yang's stellar body. She quickly drifted to yesterday, when she had buried herself in Yang's cleavage. She thought about the warmth she felt when her cheeks were pressed into the blonde's pillowy breasts, and how warm her heartbeat made her feel. Suddenly feeling that heat come back, Ruby felt her fingers wander; she never realized how easy it was to breach her panties when she wasn't wearing any notable pants. The feeling of pleasure quickly spread throughout her body as she experimented with her strokes.
It wasn't until a second too early that Ruby realized that the quiet hum of the shower had stopped. About a fraction of a second before the bathroom door swung open, Ruby removed her hand from her panties and shot up. She watched as Yang stepped out, clad in too little considering what Ruby had just been doing; as opposed to a shirt, the blonde was wearing a struggling black tube top and her tiny short shorts, both showcasing her best assets. As Ruby was already scarlet, she flipped onto her face to hide the telltale signs of her arousal. The confusing thoughts she had about her sister weren't doing wonders for her growing desires.
"Oh, hey Rubes!" Yang said, scanning the room. "You see my shirt? I thought I brought it into the bathroom, but I must have tossed it somewhere."
Worried about her voice giving her away, Ruby muffled, "N-no! I just got back from training."
"Eh, not like I need it. Oh, well." Yang stretched, raising her muscled arms overhead. "Training? Hold on…" Yang held her pause for a second before she shuffled over to her sister. "You were training?"
A bit confused as to why Yang would be confused, Ruby removed her face from her pillow and looked up to see the blonde's massive breasts. Gulping, she said, "Yeah, why?"
Yang smirked, "Cuz last I checked, you would NEVER go outside in that outfit!"
Ruby suddenly became aware that she was in a sports bra and panties. She couldn't tell Yang the truth; the reason she had stripped down was because she was jealous of the blonde's daring outfits and sex appeal. Instead, she said, "I… uh… did! I did! Gotta look cute while training, right?" She nervously laughed.
"Aww, my baby sister's growing up!" Yang sang. "So, aside from showing off your rack and that Rubooty, how was training? You seem more tired than usual."
Thankful Yang's teasing gave her a right to be flushed, Ruby adjusted herself a bit. Better facing her sister as opposed to her cleavage, she said, "I decided I needed to work extra super hard! I won't lose so easily again!" Thankfully pushing back the thoughts about Yang's naked body, Ruby asked, "Also, can you help me do some unarmed training tomorrow?"
"Aww, I'm so proud of you! Of course I will! But you gotta be ready to sweat!" Yang let off a glowing smile. "And, Fearless Leader, I think you earned a nice rest for today. Here," she said, outstretching her arms. The blonde pushed her thumbs into Ruby's lower back, attacking a point of tension.
Immediately letting out a sigh, Ruby stifled her pleasure. She wanted to say something, but Yang began rubbing her back, thoroughly massaging a place that she had no idea had that much tightness in it. The blonde's gentle fingers dug into her back, relieving so much pressure and making the post workout rest triply effective. Unable to stop herself, Ruby groaned out in pleasure, singing out, "Ohhhhhhh~" in a tone not too dissimilar to a moment ago when she was masturbating.
Without warning, Yang stopped her massage, only to climb up onto the bed, straddle the downward-facing Ruby, and begin an even deeper massage. Any and all attempts by Ruby to shut out her arousal were instantly shut down as she felt Yang's warm thighs round her bare waist. Her skin was warm and slightly wet, radiating the blonde's heat. The fact that both girls were in their underwear only made Ruby more nervous.
"I can't believe you of all people decided to train in that outfit," Yang said, a dropping sweetness in her voice. "Finally coming out of your shell?"
"Y-yeah," Ruby stuttered, trying not to cum. "I-I've been hiding for a while…" Though she was lying, the shy woman suddenly wanted to try turning heads next time she worked out. Tomorrow, she'd have to; in order to keep the lie up, she'd need to wear a skimpy sports bra and booty shorts when training with Yang. An exhibitionist thrill surged through her, not helped by the fingers running down her spine.
Feeling tears of pleasure well up in her eyes, Ruby bit her lower lip, trying her damnedest to not moan. She was forced to bury her head in her pillow when the blonde said, "You've been working yourself so hard lately! Studying, training, practicing… I'm so proud of you!" Tasting her bedsheets, Ruby felt ready to burst. As Yang continued digging her fingers into her back, she couldn't stop herself from rolling her hips; the pleasure from the blonde's massage, coupled with the compliments, coupled with the lack of clothes and excess of heat was causing Ruby to understand the term, "edge," as she grinded her bed. Had Yang not been sitting on her legs, she'd have thrown her hands between them and not stopped until she couldn't move.
Right before Ruby was about to scream out in pleasure, Yang pushed her fingers up her back one last time, digging from her lower back to her shoulders. Ruby again was forced to suppress her moans with her pillow, unsure of how to process the feelings she was feeling. She was about to climax from a deep massage and some comforting words; she was also about to climax because of Yang!
Thankful for some temporary catharsis, Yang stopped straddling Ruby. As the blonde climbed off her sister, she said, "Now, get some rest! I'm gonna work you so hard tomorrow!"
As Yang started to walk away from Ruby, she felt a vice-like grip on her arm. Looking behind her, she saw Ruby firmly attached. As the girl sat up, she tugged on the blonde's arm; Yang was pulled into a deep hug, not unlike yesterday. Ruby wrapped her arms tightly around her sister and buried her face in her chest.
Ruby felt Yang's heartbeat as she tightened her hug. Her face was buried completely in the blonde's massive cleavage, all of the warm skin surrounding her filling her with impure thoughts. She felt lust, she felt comfort, she felt a burning desire that was going to immolate her if she did not quell the flames inside of her.
Ruby wasn't going to let Yang go. She needed release, and she needed it now.