While you're visiting a porn site one of the ads catches your eye: free personalised fantasies direct to you, just use our browser add-on for a month. It sounds a little too good to be true but you figure they'll be asking for payment after the first one, but if you get anything free you'll be happy. You download it, agree unread to the terms and conditions, type in your e-mail address and then pretty must forget it. You spend the next month browsing as usual; watching porn, reading erotic fiction, downloading hypno files as well as your other internet use, occasionally you see the little thought cloud icon on your toolbar and wonder if it's doing anything. You do seem to occasionally notice a flicker of the screen and a hint of a static-y sound when you're surfing the 'net, but in no other programs- perhaps there's a bug in the add-on?

It's probably been that month's use when you go to bed one night and wake up somewhere else entirely. You're on a hospital trolley, naked and strapped down, you start to panic when someone says “lucid 24 dreaming 7” you realise you're dreaming, this is just a really intense dream, you relax and look forward to what your subconscious will come up with.

You're unable to move your head to look round, all you can see is a while panelled ceiling and some electrical conduits running along the edge of ceiling where you can just catch a glimpse of pale green wall. There is a faint scent of disinfectant in the air, the air is pleasantly warm on your naked body . A voice says “local 10 anaesthetic minutes” and someone strokes a finger in a circle on your abdomen, you feel a hint of pressure but you haven't any idea what's happening. Then your trolley is wheeled into another area. This place smells very different, a hint of dust and strongly of animals. It's little cooler in here too. Someone starts releasing the straps and you are soon able to sit up and look around.

You're in a roughly 40ft circular area, the floor is covered with wood shavings, the wall is white painted concrete, you can see a lot of cameras on the wall at various points and the main feature in the centre of the room is what looks like an animatronic life-size cow, it's fairly realistic with a black and white coat, if with slightly too thick legs but currently there is a large panel open on the side so you can see inside the body and you can see the electronics inside. Standing next to your trolley is a man wearing a white lab coat over slightly dusty jeans and a plaid shirt, it's an odd combination but it seems to suit him. He helps you up and guides you over to the cow. He starts to speak while one hand strokes your back and the other stroke the cow's.

“We've been studying your fetishes, your kinks, you darkest fantasies and now the world is going to see one of them acted out.” He gestures at the cameras.

“And you'll enjoy every moment, won't you?” You nod enthusiastically, this is a great dream. “Good, now climb in.” He help you climb into the cow, your legs go into its legs, there's a padded cradle under your abdomen and your arms stretch out in front of you and are clamped in place. You feel so secure. Then the man attaches some sort of devices to your nipples and disappears from your field of view, then you feel something fairly thin but long enter your pussy, then retreat again leaving something behind, it feels like a squishy tube, you can crush it down easily with your muscles but it springs back when you relax.

The man comes back into view and asks “Ready, cow?” but when you open your mouth to affirm your consent he pops a bit gag in your mouth and fastens it. Then he shuts the panel and you are in complete darkness for a moment before a display comes to life in front of you. On the screen you can see the cow, it zooms in on the cow's face for a while and you can see that your facial movements are echoed by the cow and even its eyes are small displays showing your eyes, you marvel for a while at your bovine self before the camera pulls back and you can see that the man is leading a huge bull into the room. The bull is magnificent, creamy coloured and heavily muscled without an ounce of fat, and as the camera angle changes you can see enormous, melon sized balls hanging under him. You watch as the animal approaches your new form, the man remove the lead rope and leaves the room. The bull's head is up, tasting the air and obviously finding it interesting as he lets out a grunting roar and rears up. Another camera changes shows you his cock emerging from its sheath, you watch it harden with anticipation, the camera flicks back your face for a moment, the open mouthed cow waiting to be bred.

Finally you get to watch and feel as the bull mounts you fully, sliding his cock into you, the sleeve already inside you making sure he gets guided straight into your pussy. The cock is too big to be comfortable but you love it, the pleasure and pain feel so right. It's literally so hot inside you too. He thrusts into you hard, slips out slightly then shoves in hard and a little deeper than before. Your attention flicks from the internal sensations back to the display, you see your wide eyes in cow's blissed out, slack jawed face, tensing in time with bull's thrust. Then the view changes to the bull's cock where it enters your pussy for a bit, the thick, glistening, dark pink cock going into the blush pink centre of your black and white backside, the huge balls swinging with every movement. You can hear the obscene squishing, squelching of his thrusting behind you and his rasping breath, almost booming above you. The view changes to a wide angle shot and you watch the bull move on top of you, almost slipping off you before thrusting in harder to make sure he's properly inside you, he does this many time before he's content, every thrust takes your breath away.

Pleasure, pain, so good, you're a good cow, being bred, going to have a calf, give milk, such a good cow. Lucky cow, bred by a handsome bull, so good, want his cum, want to cum.

With a loud, rasping grunt the bull starts to cum, it feels amazing, flooding your pussy, you cum too as you feel the hot liquid spilling into you, your pussy clamps down of the huge cock, trapping all of his sperm inside you for a while and you can feel the sheer volume stretching your insides and forcing it's way into your womb before your muscle relax again and the flood can escape your body. You watch the waterfall of white cascade from your pussy on the screen, so hot. Then the bull pulls out and you can see that wonderful cock flop out of you before the camera focuses on your gaping cum filled pussy.

After a final view of your blissful face the display changes to slowly changing images interspersed with flickering text, you can half hear whispering around you but all you can focus on is the display, the view of you it shows you, pregnant, growing heavy with calf, the life growing, moving inside you, you feel it all, as the time for you to calve draws near your udders swell, heavy, sooo heavy with milk, such a good cow. Then pain, pushing, calving, your calf is so handsome, creamy-gold like his father, you lick him lovingly and then he starts to suckle your teats, you're such a good cow, colostrum milk will help your calf grown up big and strong, good cow, time passes and now your calf is lead way and you moo with distress, but then you're hooked up to the milker, so good, good cow, getting milked, moo. Milking is what you live for, suck, moo, so good, good cow. Milking over you wait, your udders, filling slowly, achingly full, you moo lowly wanting to be milked before the bliss of being hooked up to the milker again, suck, pump, moo, suck, good cow, suck, moo, this is your life now, soo happy, just a dumb, happy, dairy cow. Mooo.

Milked empty you fall asleep, (what was that hissing noise and funny smell as you fell asleep?) and you wake back in your own bed, such a hot dream, so real you think, you'd even swear your breasts are sore and a little bigger than remember...