Lilly's heartbeat thrums against mine, our skin slick with sweat as we move together in the half-darkness of her bedroom. The sheets beneath us are tangled and warm.

"Isn't this nice?" Lilly whispers against my lips between kisses, her fingers laced with mine above my head. "Just you and me." Her hips roll against mine in a slow, deliberate rhythm that makes my breath catch. "Alone." Another kiss, deeper this time. "No distractions."

I glance over at Rose's sleeping form beside us, her chest rising and falling in the steady rhythm of deep sleep. Her auburn hair fans out across the pillow like a pool of liquid copper, her face peaceful in a way it rarely is when she's awake. She passed out almost immediately after her orgasm, completely spent from our earlier activities.

"Yeah," I breathe, turning my attention back to Lilly as she presses her body closer to mine. "It's fun."

Lilly's eyes catch mine in the dim light filtering through the curtains, that intense green that always seems to see straight through me. Her pupils are blown wide with desire and hunger.

"I love when she's asleep," Lilly murmurs, her lips trailing down my neck. "I can have you all to myself."

I feel a momentary pang of guilt at her words, but it dissolves quickly under her touch. My hands find her waist, guiding her movements as we continue our slow, intimate dance.

"You always have me," I tell her, meaning it more than I can express.

Lilly's eyes flash with something dark and possessive. She drags her teeth along my collarbone, not quite hard enough to break skin but definitely hard enough to make me gasp.

"What if I told you," she breathes against my throat, "that I wanted you all to myself?" Her hips grind down harder, making me throb inside her. "What would you say to that, Seth?"

Before I can answer, she bites down on the sensitive spot where my neck meets my shoulder. The sharp pain sends electricity shooting through my body, making me involuntarily thrust upward. I feel myself growing even harder inside her.

"Jesus, Lilly," I groan, my fingers digging into her hips.

She lifts her head, her eyes locking with mine. There's something primal in her gaze, something that makes my heart race with equal parts excitement and fear.

"Answer me," she commands, her voice soft but leaving no room for evasion. Her inner muscles clench around me, making it nearly impossible to think straight.

I glance again at Rose's sleeping form. She hasn't stirred despite our movement, her breathing still deep and even. The sight of her peaceful face contrasts sharply with Lilly's intensity above me.

"I... I don't know," I stammer, caught off guard by the question. "What about Rose?"

Lilly's rhythm doesn't falter, but something shifts in her expression. She leans down until her lips are brushing against my ear.

"Do you have a favorite between us?" she whispers, her breath hot against my ear. "It's okay if you do. You can tell me."

The question hits me like a bucket of ice water. My body freezes beneath her, though she continues her slow, deliberate movements.

"What? No," I say immediately, my hands moving from her hips to cup her face. I guide her until our eyes meet. "Lilly, I don't have a favorite. I love both of you. Completely."

"You're sure?" she presses, her hips slowing but not stopping. "You can be honest with me, Seth. I won't tell her."

I stroke her cheek with my thumb, trying to convey through touch what words seem inadequate to express.

"I'm being honest," I insist. "You're both different, but I don't love one more than the other. That's not how this works for me."

Lilly's eyes darken as she processes my words. For a moment, she's perfectly still above me, her body joined with mine but motionless. Then something shifts in her expression. A flash of pure possessiveness.

Without warning, she begins moving again, but differently now. Her hips slam down against mine with new urgency, her rhythm frantic and intense. I gasp at the sudden change.

"I'm better for you, though," she whispers, her voice strained as she rides me with increasing desperation. "Can't you see that, Seth?" Her fingers dig into my chest, leaving crescent marks on my skin. "I understand what you need."

I struggle to form coherent thoughts as pleasure builds with each frantic movement. "Lilly, I…"

"Rose is chaos," she continues, cutting me off. Her voice remains controlled despite her wild movements. "She's impulsive. Dangerous." She leans down, her lips brushing against my ear. "But I'm always thinking about what's best for you. Always planning. Always protecting."

Her pace becomes almost punishing, her body taking mine with a ferocity that steals my breath. Despite the wildness of her movements, there's something calculated in her eyes, like she's proving a point with every thrust.

"I'm the one who keeps you happy," she pants above me. "I'm the one who makes sure everything works."

I glance nervously at Rose's sleeping form, afraid Lilly's intensity might wake her. But Rose remains oblivious, her breathing still deep and even.

"You're both important to me," I manage to say between ragged breaths. "I need both of you."

Lilly's eyes flash with something dangerous, and before I can react, her hands shoot to my throat. Her fingers press into my skin, cutting off my air supply with surprising strength. My eyes widen in shock as I gasp reflexively, finding nothing but pressure.

The initial panic gives way to something unexpected, a rush of pleasure that courses through my body. My hips buck upward involuntarily as her grip tightens.

A knowing smile spreads across Lilly's face as she watches my reaction. "See?" she whispers, her voice silky and triumphant. "I know what you want before you even realize it yourself."

I can't respond, can't do anything but feel as my vision starts to blur around the edges. The lack of oxygen intensifies everything, her weight on top of me, the sensation of being inside her, the dangerous thrill of being completely at her mercy.

"Cum for me, Seth," she commands, her voice cutting through the ringing in my ears.

My brain struggles to process her words through the oxygen deprivation, but my body responds immediately. The combination of her words, her control, and the lightheaded euphoria pushes me over the edge. I feel myself erupting inside her, more intensely than I've ever experienced before. Wave after wave of pleasure crashes through me as I empty everything I have deep inside her.

Just as black spots begin to dance across my vision, Lilly releases her grip. Air rushes back into my lungs in a desperate gasp that makes me dizzy with relief. As I'm still pulsing inside her, she collapses against my chest, her body shuddering with her own release.

I wrap my arms around her, holding her close as we both tremble through the aftershocks. My throat burns, but I don't care.

"I love you," I whisper hoarsely, my voice raw. "I love you so much, Lilly."

I say it again and again, like a prayer, like a confession, like a truth I can't contain.

She presses her lips to mine in a surprisingly gentle kiss. "Yes," she breathes against my mouth. "I love you too, Seth. More than you can possibly understand."

A soft rustling from beside us breaks our intimate moment. I turn my head to see Rose shifting under the sheets, her eyes fluttering open just barely, thin crescents of green peeking through heavy lids.

"You two..." she mumbles, voice thick with sleep, "are so fucking hot together."

I feel Lilly tense slightly above me, her breath catching.

Rose's lips curve into a drowsy smile as her eyes drift closed again. "Mmm... wonder if Seth would like it... if we made out..." The last few words trail off as she sinks back into unconsciousness, her breathing returning to its deep, steady rhythm.

Lilly stares at her sister for a long moment, something unreadable flickering across her face. Then she shakes her head in exasperation.

"We should probably get some sleep too," she whispers, carefully disentangling herself from me and settling at my side.

“Yeah.”