The creature was a hydra, a large reptile with multiple heads. The hydra towered over you and was easily four times the size of any horse. It had four total heads, and one of them in the center looked larger and more fearsome than the rest. Then you saw between its legs was two pitch black hemipenes that had clear knots on their tips. Each cock was the size of your entire body, and they gave off an intoxicating musky odor that filled your nostrils and turned you on. You didn’t know why you felt this way because you weren’t gay, and yet the hydra's cocks only grew more enticing the more you stared at them.
You struggled with your own willpower to pull your gaze away from the cocks, but then you were caught off guard at the sight of magnificent iridescent scales that have covered your legs and now your hands. Your hands now took the same shape as your feet forming large black claws at the tips of each of your fingers, and each lost one of their digits.
You turned to run, but suddenly there was a loud snap and you cried out feeling an intense pain from your legs. You looked down at your legs and noticed that they were now in a digitigrade form, and your feet grew to form talons just like your new hands, and they retracted a digit as well.
As you looked back you saw the multi-headed beast looming over you still and the central head of it leaned down and put its muzzle up to your pelvis and sniffed at it. You blushed as you saw this, and you saw your male member grow erect at this, but then suddenly it slowly began to pull inwards into your body and it took your balls along with it in order to form a perfect set of scaled lips between your legs. As your dick because your clitoris and your balls your ovaries you saw your hips grow outwards into a childbearing set of womanly curves. The central hydra head was still looking at your pelvis while this happened, and it watched everything with anticipation with a smile on its face.
Being forced into a quadrupedal stance, you attempted to crawl away from the hydra slowly, but suddenly a large slick surface pushed up against your new vagina and actually lifted your body off of the ground. You then fall on your ass and look back to see the central head with his tongue out and it stared you in the eyes like it was trying to seduce you.
The scales soon covered your ass and a small tail sprouted out just above where your asshole was. You now feared that you were trapped here, and not only by the beast but by your new lusts. You felt your changes accelerating by the second too now as the scales swiftly overwhelmed your stomach and upper torso.
The hydra watched this and the central head uttered, "S.... Sorry.... must.... b...breed... y...you." You let out a whimper now as your body started expanding at a rapid pace, and suddenly six sacks of flesh grew too on you chest and your stomach. You moaned while this happened as you felt all sorts of tingling feelings from your new flesh as they started to inflate.
Your body was now half the size of the hydra, and you saw the hydra walk closer to you and the central head again licked your cunt, as it's head grew with each lick against its tender folds. Your tail soon reached its full length and the sacks on your chest grew nipples on the end of each forming fully functional breasts with nipples.
Your body grew more muscle in addition to the size, and it eventually stopped growing all together to the point where you were only slightly smaller than the male hydra. You then let out a blood curdling scream as your neck cracked multiple times and it grew longer, as long as your body even. Soon three more areas did the same as three new almost dragon-like heads emerged from your where your shoulders were, and directly under the base of your own neck.
You then suddenly felt something nudge your rear and your looked back as your face started to change to see the male hydra nudging your clit. "M....must b...breed m....mate, p....please." The central head growled then two other heads from it licked your pussy and your moaned.
When this happened your face shretched into a muzzle and your mouth filled with tons of sharp and carnivorous teeth like your other heads. Then two teal colored horns emerged on your head and their heads, but suddenly spikes emerged and grew down to the tip of your tail where a final teal tail spike emerged completing your transformation.
With your transformation complete you and your heads moaned to the feelings of lust and heat from the male hydra. Your pussy felt like it was searing with heat, and you felt like that you would probably find yourself using a tree as a dildo if you didn’t let this hydra have his way with you.
"Who knows? He might be nice after..." Your thoughts were interrupted by the large moans from your fellow heads. "Need t...to breed!" One of your heads growled then another added, "Want..to...f...fuck!" Then your last head growled, "Ooooh....eggs...s...sound nice."
You contemplated what you needed right now and you did your best to tone out the other heads. Eventually you just....