Whispers Beneath the Sheets
Copyright© 2025 by Biscuit
Chapter 1
Erotica Story: Chapter 1 - When Sister and brother, are left home alone, a simple plan to kill boredom leads to more heat than either of them expected. Between failed recipes, stolen glances, and the kind of tension that simmers under every touch.
Caution: This Erotica Story contains strong sexual content, including Ma/Fa Incest Brother Sister Slow AI Generated
Ava never thought being stuck at home alone with Jace for the weekend would be anything other than mildly annoying. Their parents had gone out of town for a friend’s beach wedding, leaving behind a perfectly stocked kitchen, a long list of house rules, and a subtle warning to not kill each other.
Mostly tolerating each other, sometimes teasing, occasionally arguing over who got to control the bathroom speaker. But underneath that was something else. Something they never talked about.
Ava was 24. Jace was 21. Far enough apart that their playful teasing carried a different weight now.
She had noticed his abs before. It was hard not to Jace practically lived in sleeveless hoodies, and he never missed leg day. But she kept it to herself. Mostly.
Jace, on the other hand, had always found it hard to unsee Ava’s thick thighs. They were hard not to notice, especially when she wore those tiny shorts that somehow counted as loungewear. But she was off-limits. Technically family.
They were supposed to keep busy with their own things, but boredom doesn’t care about rules.
It started with a shared glance at the fridge.
“No way we’re surviving this weekend on just frozen pizza and instant noodles,” Ava said, pulling her messy bun tighter.
Jace shrugged. “Could be worse. I can cook. I made protein pancakes once.”
“Once?” She laughed. “Yeah, let’s not die from food poisoning. Come on. Let’s try something fun.”
They sat cross-legged in the living room, scrolling through YouTube cooking channels. Ava found one called Kitchen Chaos chaotic, loud, and filled with strange recipes like Flaming Hot Mac & Cheese Sushi and Ice Cream Fried Chicken.
They exchanged a look.
“We could totally try this,” Ava grinned.
“You’re insane.”
“Don’t act like you’re not curious.”
The first attempt deep-fried marshmallow tacos was a disaster. Flour everywhere, marshmallow in her hair, and Jace somehow burned his elbow.
But Ava laughed uncontrollably, and Jace couldn’t stop watching her. Especially when she leaned over the counter, hips swaying to some random playlist she threw on. She was barefoot, carefree, and completely out of control with a bottle of chocolate syrup in her hand.
“You are dangerous in a kitchen,” he muttered, unable to hide his grin.
Ava glanced over her shoulder, catching his stare before smirking. “You’re just mad I’m hotter than your stove.”
“Cocky much?”
“You’re just jealous of these thighs.”
She wiggled them at him shamelessly. Jace turned away, pretending to check the timer, though his ears were visibly red.
An hour later, they were covered in powdered sugar and laughter. Sitting on the counter, Ava swirled a spoon in the chocolate sauce while Jace cleaned the bowls.
“You really do work out a lot, huh?” she asked casually, eyeing the definition in his arms.
He glanced at her, then flexed jokingly. “Just trying to look good in a tank top.”
Ava rolled her eyes. “More like trying to get the girl’s attention.”
“Nah,” he said, voice quieter. “Nope.”
Her smile faded just slightly. Something lingered in the air.
“Who then?” she asked, her voice low.
He met her gaze for a second too long.
“Never mind,” he said, clearing his throat and turning back to the sink.
They stayed like that for a while. The music played. The chocolate thickened. And the air felt heavier with every second.
That night, they didn’t mention it. But Ava lay in bed, remembering the way his eyes dropped to her legs when he thought she wasn’t looking. And Jace, upstairs, couldn’t stop thinking about the way she tasted the sauce off her finger like it was the most casual, seductive thing in the world.
But it might’ve been the beginning of something even more dangerous.
The next morning came with sunlight streaming through the blinds, cutting across Ava’s face like warm blades. She blinked, stretched, and for a moment forgot Jace was just one floor above her. That yesterday had happened. That he’d stared too long at her thighs and didn’t deny it.
She wandered into the kitchen in an oversized shirt bare legs exposed, hair in an untamed mess. No makeup, no effort. Just her. But the second she saw him by the counter, shirtless, sipping from a protein shaker like it was nothing, she regretted not wearing a bra.
Jace glanced up, froze for a second, then masked it with a sip.
“Morning,” he said, voice deeper in the quiet.
Ava went for the fridge, pretending his abs weren’t practically smirking at her.
“You always wake up looking like a Calvin Klein ad?” she asked over her shoulder.
He smirked. “Only on weekends.”
She rolled her eyes but smiled as she grabbed the leftover marshmallow mess from last night. They ate mostly in silence, until Ava spoke.
“We’re not gonna talk about yesterday?”
Jace raised a brow. “What part? The part where we burned sugar to the ceiling, or the part where you moaned after tasting whipped cream?”
Ava narrowed her eyes. “I did not moan.”
“Oh, you did.”
She threw a crumpled napkin at him. He caught it effortlessly, grin still on his face.
Ava leaned on the island, fingers circling her spoon in the leftover chocolate. “So ... what were you watching last night?”
He hesitated. “You.”
Her heart skipped. Her breath stalled. He immediately regretted saying it out loud, but didn’t back down.
“I mean,” he added, quieter now, “you were kinda hard to ignore.”
She tilted her head, unsure if he was teasing again.
“Jace...”
“What?” He stepped closer, slow, casual.
Ava leaned back slightly, but didn’t move away. “I’m not some ... mistake you flirt with because you’re bored.”
His voice dropped. “You think I haven’t tried to forget how it feels when you brush against me in the hallway?”
She exhaled. Then the lights flickered. A power cut.
Ava blinked. “Are you kidding me?”
Jace chuckled, eyes adjusting. “Guess the electricity wants us to talk.”
“I don’t want to talk,” Ava said, a little too fast.
The air between them thickened. She stepped around the island slowly, barefoot on tile. Jace didn’t move, didn’t breathe.
She stood in front of him now. Inches apart. Her shirt was long, but not long enough. And his eyes dipped once traitorously before locking back onto hers.
“You’re dangerous,” he murmured.
“You’re the one who said you watched me.”
“And you didn’t like it?”
Ava’s breath caught. “I didn’t say that.”
Jace took one slow step closer.
Then another.
She didn’t stop him.
And then she was against the fridge. Cold metal on her back. Warm breath in front of her. His hand came to rest just beside her head, not touching her but close enough that she could feel the heat.
“This is stupid,” she whispered.
“I know.”
“It’s just ... heat. Boredom.”
He nodded, but didn’t step back.
“Say the word,” he said.
She stared at him. Her lips parted. But the word never came.
Instead, her fingers curled around the hem of his gym shorts, pulling him just enough that their bodies brushed.
Their lips met slow, questioning. Just a whisper of all the nights they’d both pretended to ignore.
Jace groaned softly against her mouth, hand finally sliding to her waist. She gasped when he lifted her effortless and placed her on the cold counter.
Her thighs parted instinctively. He stood between them now.
It was a kiss soaked in slow-burning denial. Tongues teasing. Breathless gasps. Her fingers threaded into his hair. His mouth left hers, trailing down to her neck, lingering where her pulse thudded against skin.
“We shouldn’t,” she whispered.
“I know,” he said again. But he didn’t stop.
And Ava didn’t want him to.
The hum of the fridge was the only sound between them. Jace’s hands gripped Ava’s thighs with a pressure that sent fire curling through her belly. Not rough just present.
Ava couldn’t stop. Not when she’d already tasted him. Not when her pulse was still thrumming like bass beneath her skin. She should’ve pulled back. Told him to go. But instead, she leaned in and pressed her lips to his again this time less hesitant.
This time like she meant it.
Jace deepened the kiss with a groan that rumbled through his chest and vibrated into her bones. His hands slid further up the soft curve of her thighs, thumbs tracing the edge of her shirt.
“I’ve wanted this,” he whispered against her lips, voice hoarse.
She swallowed hard, trying to keep her brain from floating out of her skull. “Since when?”
He kissed her jaw. “Does it matter?”
Ava tilted her head to give him better access, breath catching when his mouth found the spot just under her ear. “It does if I’ve been feeling the same thing for months.”
Jace pulled back slightly, enough to look her in the eyes. His pupils were blown wide with need, but behind them there was something else. Guilt? Hesitation?
“Then why didn’t you ever say anything?” he asked softly.
“Because this is stupid,” she said, her voice cracking. “Because we’re—”
“I know what we are,” he cut in, thumb brushing her cheek. “But that didn’t stop you from pulling me in. Or me from wanting you.”
Ava bit her lip, heart slamming against her ribs. Her thighs flexed around his hips, drawing him even closer.
“Are we actually doing this?” she whispered.
“You tell me,” Jace murmured, sliding one hand under the hem of her shirt, palm splaying across the small of her back. His skin was hot.
The silence stretched between them.
Then her hands moved. She tugged her oversized shirt off in one swift motion, letting it fall behind her on the floor. Beneath it, she wore nothing but her black lace underwear. The kind meant for comfort, not seduction. But judging by the look in Jace’s eyes it didn’t matter.
“Holy shit,” he breathed.
His hands found her waist again, reverent now. Thumbs tracing just beneath the curve of her ribs. “You’re killing me.”
Ava leaned forward and kissed the edge of his jaw. “You’re still overdressed.”
He chuckled dark, low and stepped back just enough to pull off his gym shorts and boxers in one motion. She tried not to stare. Failed. Heat rose in her cheeks as her eyes swept down, then back up.
Jace caught her look and grinned, stepping back between her legs.
“Still think it’s just boredom?” he asked.
“I don’t know what it is,” she whispered, looping her arms around his neck. “But I don’t want to stop it.”
The kiss they fell into this time wasn’t soft. It was starved. His mouth devoured hers, their tongues tangled, breaths hot and desperate. His hands roamed her sides, then her thighs, thumbs pressing into soft flesh like he was mapping every inch.
She felt his hardness pressing between them thick and her body arched instinctively into him.
“You sure?” he rasped, voice ragged.
Ava nodded, pulling him closer, needing to feel him everywhere. “Just don’t stop.”
And Jace didn’t.
He slid her underwear down her thighs slowly, kissing each inch of exposed skin like it was sacred. When she gasped, his eyes lifted to hers.
Then he lowered his head between her legs.