Nil's "birthday"

This is another partially-formed fantasy I've had for a while. It's about a girl known only as "Nil", whose Mistress keeps her perpetually within a whisker of climax while forever denying her satisfaction.

Nil awakes, shivering and trembling, next to her Mistress in bed. The night before, Mistress had spent many hours making love to her, teasing her to the brink of madness. Her training over the years had helped her cope for a long time, but her endurance was finite. She eventually had to beg her Mistress to slow down to allow her to cool off. But Mistress knew her responses too well, forcing Nil to soar ever higher, so dangerously close to her forbidden release that she was sobbing. Eventually, her nervous system had simply overloaded and she'd fainted, falling into an exhausted slumber.

Her Mistress rolls over, smiling at her slave, their bodies bathed in the early morning light washing over the bed. She reaches over to caress her lover's breast.

"Mmmm... Happy birthday, love", she says, rolling the girl's enormously swollen nipple between her fingers.

A tidal wave of tension crashes over Nil, and she cries out, eyes flying wide open, fearful. "Oh, please Mistress. Please... be very careful touching me."

"Oh? What is it darling?"

"I'm so... very... close."

Nil's Mistress rises to examine her. She has her thighs splayed wide apart, thickly coated with their shared sexual juices. Her labia are deliciously swollen, and her magnificent clitoris stands firm, glistening. Over the years, the delectable organ has grown the size and colour of a plum or a passionfruit. Her entire vulva is bathed in sexual fluids, and her vagina pulses rhythmically, aching to clamp down onto something. Nil's hands are clawing at her belly, slightly above her mons, as she fights the need to quell her fires.

Casually, Mistress lightly brushes her fingertips across the giant clitoris before planting a wet kiss upon it. Her submissive responds by wailing aloud and tensing.

"Oh my baby, you are exquisitely close. And I haven't even started on you today", the Mistress tells her.

"Mistress, I think... I think I almost had a wet dream."

Her Mistress climbs atop her, sliding her legs between Nil's, and begins slowly humping her own boiling sex against the enormous clitoral knob, oblivious to the feelings she's stirring in her slave.

"Mmmm, baby. Be good for me. You're so good. You've been good for so very, very long", she whispers into her slave's ear.

"Do you remember it? The first time - the last time. The ONLY time your body has ever been allowed to reach orgasm? So many years ago?

"I worked you up to it for weeks, months... Wanted you to know what you were sacrificing for me.

"I need to keep you like this, aching, burning for me, day and night. Oh, you're so good, love. Knowing you suffer like this keeps me horny and creamy all the time. It makes my orgasms SOOO powerful, knowing that my slave must forever be starved of that beautiful release."

Nil, now fully awake, has regained some level of control over her feelings, and is able to subdue her need, but Mistress's teasing talk keeps her near to the edge.

"Doesn't it make you feel crazy, knowing that I'll never let your poor body have what she's crying, screaming out for so desperately?

"Knowing that I'll never, never, EVER let you come?"

Nil's eyes have glazed over, as she has fallen so deeply into sub-space. But now, she is able to retain the control she has exerted over herself for so long.

"Silly Nil, you know girls don't have wet dreams. Only boys do... And that reminds me."

Mistress calls her male submissive to rise and rolls over, using his engorged penis to tease Nil's vulva and perinium. After a long while, she orders him to release his own long-withheld climax, ejaculating his huge load across Nil's sex and plastering her huge clitoris with more fluids.

"It's been five years, Nil. Happy 'birthday', darling. Now, lick the icing from your cake, and eat it. But always remember that you can never 'have' it...'

Out of her mind with arousal, Nil performs a feat of contortion her Mistress has trained her for over the years. She greedily sucks and licks the glistening fluids from her own vulva, taunting and teasing her sex to ever higher levels of arousal. For her beloved Mistress, she would endure this agonising ecstacy forever.