"Don't think about it, don't think about it, pleaaaseee don't think about it," Ruby groaned in her mind, desperately trying to push images out of her mind, but it wasn't working. She was thinking about it. It wasn't even an hour ago that she'd walked into the dorm room at the same time that Weiss had walked out of their bathroom, completely naked. Barely an hour and all she could think about was the heiress' remarkable body, her pale, smooth skin, her long legs, her beautiful, mostly flat chest, the way her hair flowed down her back, and most of all, the glimpse Ruby got of Weiss' perfect pussy flashed through her mind again and again.
And crap, she was hard again.
Ruby was lying in her bed now, on her spot on top of the bunk beds, with Weiss beneath her. After some awkward yelling, Ruby had shut the door and let Weiss get dressed, and now the two of them were laying on their own beds, too nervous to bring it up. Blake and Yang had come back from classes too, and Yang was looking across from her bed at Ruby, at the way she was closing her eyes and rubbing her legs together. Yang knew all about Ruby's little problems, how pent up she could get, and how little it took to set her off. She'd hoped they could get through most of Beacon together without having to do anything, but her sister might need some help.
Ruby really needed help. If she kept rubbing her legs and squirming like this, Blake and Weiss would notice. Yang probably already has, she thought. But Weiss' body wouldn't leave her mind, and she wouldn't be able to think straight until they did. Opening her eyes, she looked over the side of her bed at Yang, to see that her sister was already looking at her with an understanding expression, and Ruby bit her lip and nodded at her.
"Alright, hey, guys, me and Ruby are gonna go out and do some...sparring! We thought we could use the practice!" Yang exclaimed to the room, standing up.
"Oh, I can come too," Blake says, putting her book down. "I haven't sparred with anyone in a while too."
"O-oh, uh, that's fine!" Yang says quickly, watching Ruby's face fall as Blake offers to come. "You have plenty of homework, right? M-maybe that's more important right now!"
"I suppose you're right," Blake sighs, dissapointed, laying back on her bed and looking for her most recent homework. "Have fun then, you two."
"H-have fun," Weiss repeats as Yang and Ruby open the dorm room door, still to embarrassed to look at Ruby.
"Oh, we will," Yang smiles, closing the door and winking at Ruby.
"Alright, follow me, I know an empty dorm room nobody uses," Yang says after a few seconds of awkward silence. "So what's got you all worked up, sis?"
"W-Weiss..." Ruby admits. "I...um...I walked in on her about to get changed...she was totally naked...I can't stop thinking about it,"
"Oh, wow!" Yang whistles, laughing a little. "Yeah, that'll do it. Alright, we're here. You ready?"
"U-uh...yes.." Ruby stammers, still nervous even after doing this plenty of times with Yang. Ruby opens the door to the empty dorm room, and Yang puts a hand on her shoulder, leading her inside. Yang gently closes the door behind them, and puts her other hand on Ruby's hip. She gently lowers her head to Ruby's, their lips inches apart.
"Take your skirt off for me, little sis," Yang says, her breath cool on Ruby's skin. Ruby moans a little, turned on by the words as she fiddles with the hem of her skirt, dropping it to the floor as she stares, enamoured, into Yang's hungry eyes. Left in her underwear, Ruby shudders as she slips her fingers under it and slowly slides it down until it sits with her skirt at her feet, and she kicks them both to the side.
"Oh, wow, she really did get you going," Yang says, her hand on Ruby's hip tracing down slowly as her eyes fill with lust. Slowly, she pulls her hand just over Ruby's hard cock, letting one fingertip gently graze the skin of her tip, eliciting a needy, low moan from Ruby, and a heavy shudder.
"How much do you need this, Rubes?" Yang whispers into her ear. "How much do you need your sister to jerk you off?"
"P-please..." Ruby whispers needily, her body nearly shaking. "I need it, Yang, I need it so much, please..."
"Good girl," Yang says, moving her hand to grip Ruby's cock fully. "Let's get this started."
Ruby yelps in suprise and pleasure as the cool feeling of Yang's hand envelops her cock, slowly pumping it back and forth in a gentle, slow rhythm.
"Y-Yang..." Ruby moans, standing up, her arms at her side as she stands there, mouth open and moaning from the pleasure.
"Are you still thinking about Weiss, Ruby?" Yang asks her, speeding her hand movement up a bit as she mentions the heiress.
"Y-yes," Ruby stammers. "I can't get her b-body out of my mind.."
"Good," Yang replies, stopping her strokes and running her thumb over Ruby's tip, feeling her precum. "I'm gonna go faster, and I want you to think just about Weiss, okay?"
"O-oka- Ohmygods!" Ruby squealed as Yang started again, faster this time. "Y-Yang..."
"Not me," Yang teases as she strokes carefully and excitedly. "Think about Weiss. Think about her perfect body. Think about what she looked like coming out of that bathroom. That smooth skin, those beautiful breasts, think about that, Ruby."
"Oh, gods...Ya- Weiss..." Ruby moans.
"That's it, Rubes," Yang says, loving the slick, wet noises that her pumping is making. "Think about Weiss sitting in front of you, taking her top off, and making you jerk off in front of her. Think about her teasing you with every part of her body. What if she took her hand and started stroking your cock just like this. How good would you feel?"
"S-s-so good..." Ruby moans, her hands gripping onto Yang's arm for purchase, her breath quickening and her cock twitching in Yang's hand, wet and covered in her precum. "I want her..so bad.."
"Good girl, fuck into my hand for her," Yang moans as Ruby starts to buck her hips. "Getting close? Then hang on." Yang stops for a second, pulling her hand away and licking her fingers clean, pulling out her phone with her free hand.
"Yanggggg...why'd you stop?" Ruby pleads, a sad look on her face, her cock twitching up and down without Yang's touch. "I'm so c-close!"
"Hold on, sis," Yang chuckles. "There we go."
Putting her hand back onto Ruby's cock, Yang uses her other hand to show Ruby her phone screen, showing her a picture of Weiss, some photo Yang had taken days ago of Weiss in her combat gear. Ruby let's out an adorable, needy moan on seeing it, and starts thrusting faster into Yang's hand, her arms back on Yang's arm.
"That's it, keep going. Pump your cock into my hand for Weiss. Look at her and imagine her in my position. Imagine her hand stroking you, imagine her taking you all in her mouth, imagine her bent over on that bunk bed of yours. Come on, Ruby, cum. Cum for Weiss. Cum!" Yang orders.
"Ooohhh, gods! Weiss!" Ruby shouts, thrusting her hips one final time as she closes her eyes, grits her teeth, and cums, her load spilling out of the tip of her cock, coating Yang's hand and shooting out of it, splattering against her sisters legs and pants. Yang coos in approval, pocketing her phone and using her free hand to stroke Ruby's hair, still gently pumping her cock, making sure every last drop of cum leaves her now softening dick.
"Thank you...so much...sis," Ruby pants, her face nestled into Yang's chest as she catches her breath, her cock pressed against her sisters leg, dripping the last of its cum.
"My pleasure, Rubes. Let's keep you cleaned up, yeah?"