The cold metal draws a hiss from Hyacinth's lips —

— but then the flick of Hailey's tailtip over her clit replaces it with a soft moan.

Hailey licks her lips at the hiss and the moan, then leans down and captures Sin's lips with her own, kissing her deeply. The length of her tail caresses against her own folds while the tip keeps flicking lightly across Sin's clit — and the whole time she presses the flat of the knife down harder, so there's no way Sin can forget it's there.

Hyacinth kisses back deeply and eagerly, her body flushing with sweat as Hailey touches and teases her.

"Hailey..."

She grins into the kiss, then nips Sin's lip again as she pulls back up. The tip of her knife teases little circles around Sin's right areola, and the tip of her tail matches those circles around Sin's clit exactly, all while her other hand gropes and squeezes Sin's left breast.

Hyacinth goes very quiet, her whole body tensing. Her hands push against Hailey's wings for a moment, then fall back. 

"And this isn't even the right spot. This is just me enjoying teasing you here 'cause I'm a fuckin' leftie." She switches hands, slowly dragging the tip of the knife into the valley of Sin's breasts and then back up the swell of the left, circling the nipple again. The spade of her tail rolls up and thrusts into Hyacinth's cunt, the length teasing lightly against her clit.

"You're not allowed to cum until you beg me for it, by the way."

Hyacinth lets out a small flustered sound —

Then as Hailey slowly sinks her tail into her, she trails off into unsteady laughter that turns to a long, heavy moan. 

"Please?" The word's barely more than a whisper.

She pinches Sin's right nipple hard, and thrusts her tail at the same moment, smirking down at her. "Please what, my pretty little prey?"

"Please," she enunciates very carefully and clearly. "Please spear your knife into me, claim me, carve into me, pierce the heart of me — " 

Her voice rises and gets more fervent as she goes on. 

"Please stab me and take my life," Hyacinth finally confesses. "I want to die on the end of your knife..."

Her tail picks up speed and a wicked grin splits her face. She thrusts and thrusts into Sin's pussy, the length of her tail stroking back and forth across her clit. She lines the tip of the knife up precisely, just a bit down the inner curve of Sin's left breast from her areola.

"With pleasure, beautiful Hyacinth. Tell me the moment you start to cum."

"Oh. Oh fuck —"

Hyacinth shuts her eyes and breathes slowly, overwhelmed by the fear of the lethal blade — but after three long breaths she reopens them and fixes her gaze on Hailey's. 

"Yours," she gasps, her breath hastening, her body arching up as she offers herself to the knife. "Yours, yours, yours, close, close, please, Hailey —"

She cuts herself off and grits her teeth, hoping against hope to stave off the encroaching orgasm, but it's no use. 

And in that same moment, she plunges the blade into Hyacinth's breast, stabbing deep, between the ribs, piercing directly into her heart. She thrusts her tail even harder into Sin's cunt, and slides her free hand down to stroke and finger Sin's clit, the length of her tail rubbing along her own folds. She gasps as she raptly watches Sin's face.

"Mine," she murmurs. "My Hyacinth, my Sin, my beautiful prey."

The stab falls, sharp and bright and searing —

It's quick. Like she wanted it. The tearing pain and the incredible pleasure roll through her as one force, tearing her apart from her heart outward. Her heart stops, and darkness creeps in.

It hurts. It hurts so much. But she goes with a slight smile on her face, and her gaze never leaves Hailey's until it goes completely sightless.