Let's just say Mistress Death is played by Sally Hawkins. Why? Because I said so. This will really just be me telling Infinity War the way I want because I want to. I cannot wait!
The cosmos blink, and their eyes stay lightless. The stars cease to glimmer as Thanos gazes upon them. Even his mighty throne, forged from the murdered stone of Titan and Chitauri propulsion motors, made no sound. The dotting lights on it were hushed into blackness. One massive, midnight-colored hand rests on his armored temple, and Thanos contemplates the universe he surveys. Or rather, the edge of it.
Where Thanos stares is where the universe ends, begins to fray and tear ever so slightly. Here, existence fades in and out at odd intervals. The coding that made up all reality, like an old rug, had developed holes at its edge. These revealed only darkness to the Mad Titan's alien eyes. Through these portals was oblivion blacker and more incalculable than the deepest depths of space. Thanos could feel the power wafting from them. Gravity and inertia and specks of spatial dust, unveiled to him by his superhuman senses, bent around the holes. As existence winks out, it sucks radiation and electromagnetic fields into the same crushing destruction it suffers. He leans forward. Thanos' fingers, secure in the golden mail of the Infinity Gauntlet, stroke his wrinkled chin.
It was that same quiet, inevitable sun of death that once, long ago, had brought Thanos up from nothing. Now he calls to her again, as he has so many times before. The thunderclap of his fist upon the armchair of his throne mirrors the pangs of longing in his heart. He implores her to come to him again, and allow him to gather the offering he hoped to gift her. Soon Thanos' crusade will begin. He wishes only to look upon her one last time before he departs.
His request yields fruit.
From far out, beyond the edge of the universe, where even black holes are choked into silence, she comes.
She is tall, taller than the mind can comprehend. Her skin blazes as white as the core of a star, and her hair is as wild and long as a solar system off its axis, as does her black cloak. Like a moon, circular and commanding, her face curves. She is bigger and taller and so impossibly high that it seems to Thanos that she could take the whole of reality in the palm of her hand. Around her, those holes in time and space widen, growing hungrily as if her mere presence degrades the universe around her.
In one blink of the Mad Titan's piercing eyes, she is in front of him, his size. Thanos rises from his throne, and kneels his great, godlike bulk at her feet.
"Mistress Death," he breathes, his eyes burning into the endless expanse of space he and the object of his affections are suspended upon. He feels her smile; cold, lifeless, but a comfort of Thanos' that was second to none. One of her dainty hands caresses his jaw, and the Mad Titan is clay in her grip.
"Rise, my love," Thanos hears Death say. He stands now, dwarfing her now that she's shrunk. Deep into her milky white, pupiless eyes he gazes, full of dark adoration. As tenderly as a universal primordial like Death can, she meets his gaze. As content as she once he embraces her, she weeps. Thanos notes with morbid rage the black tears flowing from her eyes. One purple blue finger trails over Death's cheek. The flesh is as frozen as the vacuum of space on Thanos' digit as he wipes away the dark fluid.
"Why do you weep, Mistress? Who has wounded you?" Thanos rumbles. Death sniffs, still imperious despite whatever is now eating at her unbeating heart. He searches her features, contemplating.
She pats the blue material of Thanos' armor, shaking her head. "My beloved," Death replies. "It is my daughter. You remember her, do you not? Born of my union with the king of the Asgardians. Recently his soul has passed into my grip, and I watched as Asgard fell and my sweet Hela and Surtur destroyed each other. You know his kiss, dearest; like the flames he devours all he touches. I cannot feel her consciousness out in the cosmos."
Thanos, hard heart awakening more and more every moment he was near Death, smiles. This was not the grin he wore when he ripped the limbs from his daughter, Nebula; nor was this the smirk that had plastered itself across his alien countenance when The Other, his deceased servant, had warned him of the dangers of challenging the heroes of Earth. No, the Mad Titan smiles with pride; pride for how totally he is about to wipe away her sorrow.
"True, you may not feel the tug of her being any longer," Thanos begins, his booming voice barely above a whisper. The wide, harsh planes of his face are very close to the smooth swirls of Death's. "But soon, you will be overflowing with the imprints of others' consciousnesses. From Earth to Xandar to Olympus to Zenn-La the universe will buckle between my hands. I give all of them, and the starways I will bathe in their blood, to you, Mistress."
Death's monochromatic eyes widen, and suddenly Thanos has her full attention. "I have . . . heard them calling- felt their emanations all over the universe. The Stones. My love . . . you do not mean that-" Thanos hefts the Infinity Gauntlet, taking the ghost of Death's hand in its unfeeling metal fortress of fingers.
"I do. My Black Order scours known space for them even now."
"You know what you must do, don't you? Where you must return to? You know what waits for you there."
Thanos' face sours slightly. His hand in the Gauntlet squeezes his lover's fingers tighter, wantingly. Eyes gazing unfocused into the unending cauldrons of blackness around him, he speaks slowly and severely.
"It is no pain I haven't suffered already," he grunts. At the thought of returning to such a graveyard as home, Thanos suddenly feels very weary. "I wished to see you, once more, before I join my Outriders and find the Stones. It may be a great while before I can come here once again."
Death's demeanor changes, becomes more sultry, and lips as blue as a drowned corpse's meet Thanos's own. The Mad Titan seizes her in his powerful arms and holds her to him possessively.
"I have seen your heart, Thanos of Titan."
Death's cloak is gone now. She is nude, destructive, crushing and black and beautiful; entropy itself.
"Show me the rest of you," she whispers.
Shadows and warping sightless time close in on the two. As they make love, hidden in the void of existence that had opened around them, Thanos immerses himself in death. Not the cosmic force that pleasured him now, but the concept. Inescapable ruination. The absence of breath, of blinking and moving. Curiosity and hate and pondering and despair all are burned out in the blink of an instant. They snake closer now, joined at the hips. Death's face appears in Thanos' head, still, muscles relaxed, white irises hidden. The mind image is dead, and the Mad Titan knows Death sees him the same way within her own eldritch thoughts. It builds their insidious passions, both of them so obsessed with that final destiny.
As they approach the end, Thanos wraps his hand in the Infinity Gauntlet around Death's throat. She arches around him, undulating like waves of cosmic radiation under his touch. The Gauntlet glints, even in the rich darkness around them, and he sees the stars snuffed out, the galaxy on fire, and the universe returned to dim, dark, serene quiet.
That is all it takes to push him over the edge, and he shudders with Death in his hands.
When Thanos comes to, he rests on his throne, again observing the same pinpoints of nothing that had been poked in material reality he had been earlier. A chill so cold it burns still ripples from his lips.
Confident, Thanos makes a fist in his new Gauntlet, and turns back towards the stars . . . ready to destroy them all.