A quick single page TF sequence drawn as an experiment, limiting the number of frames I use. I also tried a bit of shading / shadow. Story below.
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“This won’t hurt a bit” She heard the doctor say, moments before she jabbed the needle into Lucy’s buttock. Her eyes went wide and she cried out in surprise at the pain. This was the final injection in the drug trial Lucy was taking part in.

Something felt different this time. After the doctor left the room, Lucy started to feel strange, as though her skin were being brushed by hundreds of feathers. It tickled so much she closed her eyes and began to giggle. She couldn’t see the downy fur growing rapidly over her body.

After several minutes Lucy was covered in a thick coat of grey fur. Her face had stretched into a dog like muzzle and her ears had become pointed and furry. She couldn’t believe what was happening, closing her eyes again, hoping it was a dream.

At last the strange sensations stopped, and Lucy opened her large canine eyes. Something must have changed in her mind too, as she immediately broke into a feral smile, showing off her sharp teeth. She stroked her thick fur, wagged her tail and waited for the doctor to return so that Lucy could give her the results.