Chapter 1: Egg Nog and Temptation
The Christmas Eve gathering was in full swing, the air thick with the scent of pine, cinnamon, and the heady punch of egg nog. Cassie, usually the reserved older sister, found herself several glasses deep into the golden, creamy concoction. Her tongue was looser than the ribbon on a poorly wrapped gift, and her words at the family table were drawing laughter—some shocked, some delighted—from the relatives gathered around.
But it wasn’t the laughter that had her pulse racing. It was Emily, her little sister, sitting across the table in a scandalously skimpy Santa dress. The red fabric clung to her lithe frame, the fluffy white trim teasingly high on her thighs, and a big white bow sat perched above her petite chest. With her nerdy glasses and innocent face peeking out from under a matching Santa cap, Emily was a vision of forbidden fruit. At her age, she shouldn’t have been wearing something so provocative, and Cassie—damn it—couldn’t stop staring. She’d always been close to Emily, but tonight, fueled by liquor and lust, she ached to be closer in ways that made her skin burn.
“Pssst!” Emily’s voice cut through Cassie’s haze as she stumbled into the kitchen for another glass of egg nog, hoping to drown the throbbing need in her core. Her sister had followed, her giggle light and teasing as she leaned in. “Give me some, too?”
Cassie turned, her gaze raking over Emily’s angelic form with a drunken hunger she couldn’t hide. “Huh?” she slurred, a smirk tugging at her lips.
“Come on, I’m plenty grown up! It’s Christmas!” Emily pouted, crossing her arms in a way that only pushed her chest out further.
“You?” Cassie pointed a wobbly finger right at Emily’s face, her voice dripping with playful accusation. “You don’t even have breasts yet!”
“Do too!” Emily shot back, puffing out her chest defiantly. “Feel them!”
The challenge hung in the air like a dare wrapped in tinsel. Cassie’s breath hitched, the egg nog doing nothing to dull the heat pooling between her thighs. “You can’t just go around offering people to feel you up!” she snapped, though her tone was more amused than scolding.
“Who said anything about feeling me up?” Emily retorted with a mock huff, her brown eyes sparkling with mischief. “You’re my sister.”
That was all the push Cassie needed. Alcohol-aided confidence surged through her, and before she could stop herself, her hand was down the front of Emily’s dress. Her fingers squeezed the soft, perky flesh, reveling in the lack of a bra, tracing every budding curve with a boldness she’d never dared sober. Emily’s eyes widened in shock, but she didn’t pull away, just stood there, letting her older sister take what she wanted.
When Cassie finally pulled her hand back, Emily shook her head as if to clear it, her cheeks flushed. “Whoa… now you *have* to give me some!”
Two full glasses of egg nog later, Emily’s face was as red as her dress, her voice a mix of demand and drunken bravado. “Nowww, you hafta let me touch yours!”
Cassie’s mind screamed to stop, to glance at the doorway where the family’s chatter echoed just beyond, but her body betrayed her. “Your room,” she growled, her voice low and dangerous as she marched Emily through the kitchen’s other exit, down the hall to her cutesy, nerdy haven of a bedroom—fairy lights twinkling, anime posters on the walls, and bedsheets emblazoned with some obscure Japanese brand.
There were no protests. Emily, tipsy and giggling, seemed to dare her sister to cross the line. Cassie lowered her arms, offering her own chest, and Emily’s small hands eagerly explored through her top. But then, with a sly glance up through those nerdy glasses, Emily’s hand dropped lower, finding the unmistakable bulge straining against Cassie’s jeans.
“Emmy,” Cassie warned, her voice a rough whisper, but her sister just giggled, her touch bold and unapologetic.
“What?” Emily teased, her fingers lingering as if daring Cassie to act.
Cassie broke away only to stride to the door, shutting it with a decisive click and turning the lock. Old enough for a lock, old enough for more, she thought, her mind a haze of lust and liquor. Emily had already perched on the bed, her head tilted, her expression a mix of dizzy anticipation and uncertainty.
Fuck it. Cassie was already on the naughty list this year, and she didn’t care. She crossed the room in two strides, her lips crashing into Emily’s with a hunger she’d suppressed for too long. Their tongues tangled, hot and desperate, Emily’s small frame pressing back with surprising ferocity. Kissing wasn’t enough—Cassie needed more, her body aching, her mind racing with thoughts of running away with Emily, of nights filled with this forbidden heat.
Her hands roamed, pushing up the hem of that scandalous Santa dress, revealing striped panties that screamed secret rebellion. Cassie’s fingers brushed against the fabric, finding it already damp, and a growl escaped her throat. She needed to taste, to feel, to claim. As she tugged the panties down Emily’s thighs, her sister’s half-hearted protest barely registered over the pounding in her ears.
“H-hey, that’s… too far…” Emily mumbled, but her body didn’t fight, her legs trembling as Cassie’s touch ignited her skin.
Cassie didn’t stop. She couldn’t. Not when Emily was dripping wet, not when the scent of her arousal was driving Cassie wild. She leaned in, her breath hot against Emily’s core, ready to devour her completely, to push them both over the edge into a Christmas sin they’d never forget.
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