Nuetorare

Most fortunate you are, Anon, as you've piqued the attention of a certain unidentified youkai.
Mysterious and mischevious. Though little more than a nuisance at first, you quickly warmed up to her. Nue's antics were a nice little respite from your monotonous everyday life, her presence became something you could always look forward to.
And eventually, much more than that.

. . .

The sun was setting down on the village, clouds were drifting across the orange-tinted sky. Birds singing, fairies playing. It was an afternoon like any other, you had just come back home from a trip to the market, groceries in hand, as Nue's ill-fated attempts at cooking left you running low on vegetables.
An unusually quiet trip, as she would usually lunge at you from dragon god knows where and come along wherever you went. The reason for it soon became apparent, as the nue was peacefully laying down on the table, legs pointing upwards. Weird, but when she was around, what wasn't?
Her eyes lit up as soon as she saw you, like a puppy whose owner returned after a long day at work. She greeted you with the usual enthusiasm, her cheerful voice soothing the pain in your arms, as you had to lug around much more than you initially thought.
You returned the greeting, laying the groceries down before taking a seat. With a smile, she made a gesture with her fingers, an invitation to hold her hand that you gladly accepted. Her grip was gentle but firm, the softness of her skin pressing against yours was always welcome.

You enjoyed this quiet little moment together, hopelessly unaware that your dear darling Nue was about to take eight inches from another man right before you.

Next to the enigmatic youkai was a man, her most recent partner in sexual crime. His corpulent appearance had been concealed, turned into an "unknown object" by the use of her powers.
What others may see in their place varies on an individual basis: what they want to see, how they might rationalize it, so on and so forth. Your subconscious struggled to process a reason for him to be there, the thought of Nue cheating simply inconcievable. All you saw as a result was a shapeless blur of nothing, his presence completely blocked off your mind.
This was something she took full advantage of. Nue making sexual noises with seemingly nothing to stimulate her was a scene that had played out far too many times already, her head peeking from a curtain or around the corner, sometimes in the bath, sometimes through a half-open door. Her bodycount in your relationship sitting comfortably in the double digits.
Not knowing any better, you figured it was all just to mess with you, a long-running joke at your expense. In bad taste perhaps, but even when she's done worse you couldn't get mad at her, Nue was incorrigible and you loved her that way.

In any case, the gross man was rubbing his penis all across her thighs, as if marking your girl as his property, the trail of smegma and precum left behind made unidentifiable as well. Good thing the star guest arrived, as his patience had just run out.
A pair of panties were the only thing standing between his monster and her tight youkai pussy, their efforts quickly thwarted as she pulled them out with her free hand, left to hang from one of her legs as they spread out to welcome their newest guest. Nue's heart pounded in anticipation as his dick lined up with her wet pussy, the man held onto her waist with his filthy hands as he began to make his way inside, slowly digging all the way in as she bit her lower lip, moans stifled but still audible despite her efforts.

He began to pound her like a pig in heat, his dick slid in and out of her mysterious hole at an increasing pace. Fortunately, her control over perception extended beyond just visuals, the meat slapping noises that followed would have blown a hole in her cover otherwise. Words, on the other hand, were impossibly harder to cover up, and that was the only thing stopping him from loudly boasting about his sexual superiority with every thrust into your youkai girlfriend.

All the while, you stood there, a witness to nothing. Anchored to your seat by the steady hold on your hand, she did not want you to miss a thing.
And though unsure why, this situation aroused you far more than you were willing to admit.

. . .

He picked up the pace, his squealing a clear sign that he was at the edge of climax. The man tried to pull out, but quickly found himself ensnared by her legs. The nue's grip on you both tightened, compelling him to unload inside of her irresponsibly while you hadn't gone past a kiss on her cheek.
His fat dick pulsated inside of her as it began to pump out, thick nut slowly filling her womb with each shot. The image of her clueless lover fresh in her mind was mixed with the intoxicating thrill of cheating to make a cocktail of pure ecstasy, and she loved every second of it.

When his fat hairy balls were emptied, the robust man fell down with a loud thud as soon as she let go of him, in a dizzy stupor and drained in more ways than one. His parting gift was a very familiar warmth on her lower abdomen, this much was more than enough to knock up any other youkai, let alone a human. Leaking shamelessly into the floor below, the stains left behind a problem for tomorrow's Nue to take care of.
You simply stood by her side as she basked in the afterglow, her breath ragged, legs quivering, a visibly happy expression on her face, not an ounce of shame nor remorse for what she had done.

. . .

With your help, she stood up once more. Legs shaky, but nothing she couldn't handle. The man had left by now, the two of you alone together once more.
Nue dragged you to the kitchen, eager to put the newly bought vegetables to debatably good use. This time your help was requested, which you eagerly accepted, a nice change of pace as the smell of burned onions was going to drive you insane sooner than later.
It was an evening like any other.