Ellie didn't think of herself as being bi, even if she wasn't uncomfortable with having taken a few drunken dares and party game penalties in college that had involved some pretty flirtatious, and even mildly intimate, contact with other girls.
But something about Cassie had gotten her all worked up over the past few days. Maybe it was the isolation or privacy, but what got to her most was the thrill of seeing her bossy older sister getting more sexually adventurous than Ellie had ever thought possible. There was a level of intimacy and shared secrecy about the excitement that Ellie found intoxicating.
From rubbing up against one another topless playing neck ball at Eric's party, doing body shots off one another at Spring Break or catching Cassie fingering herself on the beach, Ellie found every sexually charged situation with Cassie to be more exciting than the last. Maybe she knew, like she did with Eric, that whatever happened between she and Cassie would forever stay their secret memory of this season where the world stopped for a moment. For whatever reason, the world had created a space where suddenly it seemed like everything was suddenly possible.
Stepping into Cassie's bathroom, she could see that her sister was already in the shower. Ellie stripped off her pajamas and underwear, leaving them carelessly strewn about the bathroom floor among Cassie's own clothing. Ellie stepped into the shower to see Cassie turned toward her, her head tilted back into the water, rinsing her long black hair as warm water ran in rivulets along the curves of her long, sleek body. Ellie stepped to her and wrapped her in a naked embrace, her own breasts fitting in right below Cassie's and her cheek pressed against Cassie's chest, just under her chin.
Cassie looked down as she felt Ellie slide up to nestle into her body and wrap her in her arms. Ellie looked up at Cassie's full red lips, her deep brown eyes and the warm pink tones of her skin, flushed a deeper shade under the flow of steaming water and the intensity of her growing desire. Cassie surprised them both by being the one to kiss Ellie first. Looking down at her soft, pink lips, parted just so. They looked so swollen and juicy in that moment in a way that Cassie had never noticed before. As their mouths met, Cassie only remembered then that she had just had Eric's dick in her mouth, but just as quickly remembered that so had Ellie. Whatever they had done, whatever they were doing, they were doing together.
Cassie felt Ellie's hand move up to her breast and squeeze her lightly, then more firmly as their kiss intensified, even as her other hand slid down to Cassie's ass. Cassie reached up with both hands to touch Ellie's boobs, marveling at how full, soft and swollen they felt compared to the sensation of touching her own tits. She had envied Ellie since they were teens. Where Cassie had spent several years looking gawky and awkward as she reached her full height and filled out, it felt like Cassie had always been cute, curvy and the object of every boy's attention. Sliding one hand down to Ellie's deliciously curvy hip, Cassie felt herself trembling, overwhelmed by the sensation of just how naked they felt, wet under the running water, their bodies pressed up against one another.
Cassie had to lift her mouth away from the kiss as she felt Ellie's hand slide up into the folds of her pussy. Cassie's legs went weak as the sensation of having the first person to ever touch her there sent tingling waves through her body. She let out a small gasping whimper, unable to contain her reaction. Bracing her hands on Ellie's shoulders, she couldn't control how her thighs and knees shuddered with each practiced movement of Ellie's magical hands. It felt as if Ellie knew her own body better than she knew it herself. She should have felt embarrassed to be so helplessly and awkwardly overwhelmed by Ellie's touch, but as her stomach tightened repeatedly, like Ellie had found some secret switch within her that made her a twitching puppet on a finger, rather than a string, Cassie found that she was too swept up to care what it looked like. She just didn't want it to end.
Ellie leaned her head slightly to take one of Cassie's nipples in her mouth as she brushed her fingers in and through her sister's pussy, rubbing her just as if it was her own, imagining she could feel it herself through the way Cassie's body reacted to each subtle change in movement and touch. Her other hand slid around to the small of Cassie's back, trailing a single finger down her spine and following a trickle of water down into the cleft of her sister's ass, causing Cassie to clench up and giggle at the tickling sensation before gasping as Ellie slid her other fingers further up inside her. Ellie ran her hand down the smooth, wet cheek of Cassie's ass and cupped the bottom of her ass as the tips of her fingers slid in between her legs from behind.
As Ellie's hand touched the small area behind Cassie's pussy, she felt her whole body suffuse with a different wave of pleasure, working in careful harmony with the flickering and stroking sensations that Ellie was already imparting with her other hand. Leaning her face onto Ellie's shoulder, Cassie could only grip her sister's wet body for balance as she parted her legs to allow Ellie to have control of her. When the tip of Ellie's finger, warm water sliding around it, slid onto the entrance to her ass, it was as if every part of her started clenching up uncontrollably all at once. Her arms hugged her sisters neck with a desperate urgency as her body was no longer able to contain the shuddering waves of pleasure that now battered her like the small dock at her parents cabin as a Summer afternoon storm rolled in across the lake.
Ellie found herself enjoying Cassie's orgasm almost as much as her sister seemed to, exulting in the fact that she had been able to bring her so much pleasure, amazed that Cassie had allowed her to in the first place. When Cassie slid to her knees and crawled to the sloped edge of the tub to lie quivering in the afterglow of sensation that still left her weak and helpless, Ellie took a moment to duck under the shower head that she now had to herself, wetting her hair and washing her body as she let Cassie enjoy the moments of limp, trembling joy that even now suffused her.
Cassie opened her eyes as she felt her body go limp, watching the water slide over Ellie's curvaceous body, pink, glistening and desirable. Where she had envied Ellie for all those years, she found looking at her naked now brought her only a sense of joy that her voluptuous curves were something that they now secretly shared between them. Just as Cassie's body had been opened up to Ellie, there was nothing now to be envied between them, only things that had been shared and things left to be discovered. Cassie rubbed her nose with the back of her hand, carelessly like a little kid, as it had begun to itch as if circulation was slowly returning, or the last magic of the pleasure her sister had given her was now leaving her body, through the tip of her nose.
