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you understand why they need to, and you understand it's in their nature, they see you as their mate.

it took a while but you finally were able to get them to understand human biology and where your priorities were right now in terms of, ahem, in their words, 'breeding'.

which is why it doesn't make sense that one night you get an urge.

you're lying on your back, tentacles wrapped around your wrists which are holding your arms up together, your thighs are also being held apart while the biggest, thickest tentacle is thrusting in and out of your hole quickly and hard, just like your partner knows you enjoy.

and, it just feels so good, the tentacle inside starts throbbing, your walls clenching around it, and it's a sign they're about to cum, so in the last minute, and overcome by pleasure and your own orgasm, you take them by surprise.

you close your legs as fast as you can, just in time for all their cum fill you up completely, leaving you stuffed. your partner is surprised but they are helpless.

The "Pussy Portal" company are always hiring after all.

All you have to do is have a portal directly connected to your pussy that any paying customer can use at any time. What could go wrong?

Just realized u didn't actually say it had to be monsterfucking specifically but I made it that anyway lmao.

At least you thought it was going to be very little work on your part.

But now you're not so sure as you sit on the train ride home trying to act like there isn't a monster cock reaching deep in your cunt.

You curse yourself for not reading the terms and conditions of the contract properly. You thought they were just being hyperbolic when they said "Prime Pussy Anywhere, Anytime!" Surely they would have down times right?

No. There are no down times unless you call in a sick day of which you only have few. You shoulda known that pay was too good to be true.

At least whoever's using your portal seems to only be cockwarming themselves for the time being, although that could change at any moment. Every jerk of the train makes you tense up as you try and act as nonchalant as possible. The cock sits so snug and warm inside you, it twitches every time you tense around it.

On the customer app your portal is advertised as specifically "Human pussy" so you like imagining the kinds of monsters who would pick that out specifically. You haven't figured out what monster this one might be, it's rather thick and hot with a very generous amount of precum.

When you get to your stop the train jerks more than you expected and you have to subtly cover your mouth and grab the railing to avoid making a sound. Your customer definitely felt you clench down in panic as their cock jumps in excitement.

They start grinding down slowly on the portal, their cock thrusting shallowly. You speed walk straight for the train station bathrooms and lock yourself inside a stall. Close call but you made it and just in time for their shallow thrusts to turn into full pumps into your slick pussy.

You lean your back on the wall of the stall as your cunt is now being thoroughly pounded by this stranger. You have to crouch to your knees as your orgasm builds up, rubbing your clit with one hand while the other covers your mouth.

Just as you're about to tip over the edge you feel something bigger at the base of the shaft bump against your pussy with each hard thrust. You gasp in realization but it's too late as the monster thrusts their knot past your entrance and you cum hard with a silent scream, spasming and shaking against the bathroom stall.

Their cum fills you to the brim, kept inside by their inflamed knot. They don't stop cumming for several minutes but when they do it takes you several more to compose yourself enough to step out of the bathroom on wobbly legs.

You make the slow and embarrassing walk home while the monster's knot sits snuggly inside your pussy, keeping all that warm cum inside you.

The knot inside you doesn't deflate fully until you're already home and making dinner. You have to grip the counter, shivering slightly as your customer pulls out and goes on with their day having been properly satisfied. The thought makes you feel a strange sense of pride. Just then your phone beeps with a notification from the Portal companies app.

The customer left a tip!

How nice! They also left a review on your page,

feeling their desirous gaze on you while you put in drink orders at the bar

holding hands on the way home from the date and it feels like a foreshadowing of what you’re going to do to each other when you get there

heavy breathing on the phone when they’re touching themself to the sound of your voice

grinding in a weird position where you’re both like ???? why does this feel so good????

If your sex is balloons, if it is blowing raspberries on your lover’s belly, if it happens fully clothed ir in furry costumes, if it happens in a group or alone — give it the same gravity, the same reverence or irreverence as all the tiresome scenes of heterosexual penetration we all grew up reading. … There is no marginal erotic unless you sideline it.”