"I didn't think so either," the Yethmazari says, content for the moment to hold himself steady above you. "Let me introduce you to a friend of mine."
You aren't entirely sure what the great demon does then, but you can see the result. Darkness coalesces in front of you, drawing in from the shadows to form the shape of a hound. Though far smaller than his master, he's still the size of a wolf, jet black in color and with blazing red eyes. Without waiting even a moment, he lunges forward, ramming himself up against your mouth and shoving at it for entrance. His claws scrabble at your back as his cock begins to push between your lips. You might want to bite him, but even as you try you feel the last of your strength being sapped by the poison. You are, now, absolutely helpless to do anything but lie there and take it.
And the Yethmazari is more than happy to give it, too. Another quick jerk of his hips buries the next several inches of his length inside you. You feel a strange ripple pass along it, and a burning deep inside your body, where your vagina is being pushed open further than it was ever meant to go. At the same time, the snake slips back along you, finishing the process of stripping your clothes away and leaving you completely, helplessly naked.
He pauses and fans his wings, blowing dark, heavily scented air over you, as he calls more and more of the black hounds from the darkness. By the time he's finished, five of the creatures are there, baying loudly and sending echoes of the same terror that their lord evoked with his own howls running through you. This time, though, you're unable even to flee.
The first to arrive continues thrusting inside your mouth, but the others are hardly willing to be left out. A quick fight for dominance breaks out in front of you as they brawl for position. The Yethmazari seems content to wait, holding your limp body up with one wingtip, until his pack has things sorted out.
Finally, everyone is ready to resume using you as a fucktoy. Three of the black hounds are perched in front of you, their cocks rubbing against each other as they press into your mouth. Another, underneath of them, presses your breasts together around his shaft as he hunches against your body. The last has more difficulty finding a slot, but finally settles in beside the fourth, clawing at your body and thrusting himself between your thighs.
Not that those thighs are providing much friction, because now, finally, the Yethazmari begins to thrust. His motions are slow at first, almost ponderous. Each motion of his hips churns your insides, the barbs lining his shaft tearing you up inside. You're bleeding, deep down in your core. But in a way, you're almost glad, because at least the blood provides some lubrication to his thrusts. Each one presses a little deeper than the last, a littler harder. Your body is rocking, crushing the hounds below you with each stroke.
Just when you think you can't bear any more, the snake resumes moving. Gliding over your skin, it pauses beside his cock, a little further down. A part of you wants to scream in protest that even this is being defiled, but you can't make a sound as it presses up against your anus and begins sliding inside, its sharp scales tearing at your soft inner walls.
The beasts are not kind, or gentle. They have no regard for you at all, except as a convenient hole for them to use. The hounds in front of you are thrusting deeper and deeper, one at a time shoving himself down your throat before being jostled aside. You can manage, barely, to breathe in between. Underneath you the hounds rip and tear at your skin, drawing blood now. The bottom one, tired of trying to find any satisfaction in between your thighs, abruptly bites you. A flash of indescribable pain and fear goes through you as it tears a hole in your skin and writhes around to fit its cock inside.
And the Yethazmari continues to thrust. He is slowly building his pace, now, his hips hunching against you faster and faster. You can feel your skin splitting open, tearing around his enormous member. Deep inside you think things are breaking under the force. He must surely be past your womb, by now, you were never meant to take something so large. His snake-tail wends its way through you, writhing around and pressing against your anal ring in all directions. Its well into your body but it just keeps going, bursting through when it doesn't have the patience to find a natural way through. You're bleeding, deep down inside.
The pain and the musk and the sick, twisted pleasure are too great, and they aren't slowing. If anything, they continue to ramp up as the first of the hounds hits his peak and comes, shooting a thick fluid down your throat. It tastes of flowers, and salt, and sick, sweet corruption. His cock grows thicker yet at the base as the knot swells, locking it into your mouth. Your jaws are being spread painfully wide; three canine dicks were hard enough before one of them knotted your mouth.
The next hound to come is the one inside your guts. That one hurts, it hurts terribly. The knot swells up inside you, locking in blood and semen both, and his seed bursts out so hard as to bruise you from the inside out. It burns, literally and metaphorically. You realize that you're crying. His brother beside him howls as he joins his siblings in climax, spraying your chest and face. You can see, now, that their semen is a thick black fluid, nothing like any mortal creature's.
The other two lodged inside your mouth keep moving, pushing even deeper. You're struggling to get any air past them by now, and they don't seem to care in the slightest. Rubbing against each other, against your mouth, pressing against the back of your throat, they rapidly push themselves over the edge. As all three knots lock together and push your mouth wider, you finally feel something give. With a sick crack your jaw breaks, pushing wider and wider until you look like a snake about to swallow a particularly large meal. You feel their seed painting the inside of your throat, and some gets into your lungs, but you don't even have the strength to cough.
At some unseen signal the hounds pull back, leaving you to your master as he continues thrusting. He is panting heavily in your ear, now, his tongue lolling out and flopping on your back. Any pretense of civility, of kindness, is gone now, exposing the beast underneath. His cock is twitching inside you, leaking more of that hot, stinging fluid. Another of the hounds, bolder than the rest, darts around behind you and seizes your tail in his jaws. He pulls you into the Yethazmari, forcing his cock even deeper inside you at the same time as it sends another sharp lance of pain up from where your tail is being pulled so harshly.
Finally, you can feel the knot begin to swell. You think that you can't possibly hold it inside you, but deep down you know you're wrong. The godess's herald has no intention of being stopped.
You feel a stirring in the base of your throat, and it takes a moment to remember that the hounds are gone. Then you realize what it is, and want to scream in horror, but you can't even twitch as the tail presses completely through you and erupts out of your mouth.
With a ferocious, triumphant howl, the Yethazmari buries himself again, and does not stop. The knot presses harder, harder...and then slams inside you, so forcefully that you aren't sure if it just shattered your pelvis. You can't feel your legs, and you think your tail might be about to come off entirely.
But none of that matters. Not compared to the glorious sensation of holding a god's herald inside you. Not next to the stretching as your pussy spreads open and engulfs a knot that feels as big as your head. Not as the great creature howls, and shoves you down against the floor, and jerks inside you. Spurt after spurt of his seed bursts forth inside you. You think it has to stop, but it keeps coming, and coming, and coming. Some leaks out past his knot, but there's just too much for that to be enough, and it has to find other routes through your destroyed body. Burning, coal-black seed bursts out around the snake at both ends. It dribbles from your nose. You think the baying of the hounds might be so loud as to make you deaf.
"I hope you enjoyed it," the Yethazmari says. "Remember me in your next life." He pulls out, ripping his knot back through you almost as forcefully as he put it in, and letting out a cascade of blood and semen as he does. He holds there for a moment in concentration, the room once again growing dark, then begins pressing into you again, as insistently as before. It almost feels like he's even larger than before.
Then, slowly, you feel the magic taking hold and realize what's happening. He's not growing larger; you're growing smaller. Your body shrinks down at the same time as it becomes less human. Fur sprouts from your skin, your bones break and shift into those of a quadruped.
Long before you finish your transformation into a housecat, your body splits open around his cock, and your blood floods out onto the floor, and you know no more.