Refuse her question

Struggling against your bonds, you shout and plead, helpless to your fate, "Wait! Stop! You don't understand!"

The tall, blue-skinned woman just laughs, a clear and piercing sound. "Oh, honey, I know it was sarcasm, I wasn't born yesterday." She seems to decide for you, and walks up the table to stand by your chest, pressing down on the skin just above your breasts, seemingly looking for a vein or otherwise to inject. "But you see, I am a scientist, and I don't exactly get many volunteers."

With little ceremony, she finally stabs the syringe into the area up above your breasts, its contents quickly emptying into your body. "This is a simple growth serum, as you asked for. Everything has a limit, and this is a small dose, so I'm not planning on going huge, mainly wanted to test doses."

You can feel something shifting around, a strange sort of warmth that grows out from the center of your body and eventually concentrates in your breasts. As it does, they start to expand, pushing out from your chest, nipples quickly becoming fully erect and growing slightly alongside them. Within the space of a few seconds, your breasts more than double in size, nipples growing several inches as well. You can't help but moan deeply as yours breasts swell, and as the haze of pleasure washes over you, you manage to take a look down in shock at your enlarged bust, completely at a loss for words. This woman is fully capable of changing your body, and clearing has full intent to, and there's nothing you can do about it.

As she reaches for another set of glass tubes on the stand behind her, the doctor calls back, "This next one is something that I like to call Full Stallion. It's a mixture of the same growth serum and a bit of horse DNA, usually has some fun effects."

Returning to your lower body, she loads a vial into the back of a syringe, and promptly stabs it into the skin just above your groin. Again, a warmth starts in your lower body, but this time it's internal, almost as if it doesn't reach the skin. You can feel your lower body shifting around, and the warmth shortly spreads to the front of your groin, as your pussy starts to slowly grow and morph, becoming longer, more pronounced, and wider, practically turning into that of a horse. At the same time, you start to feel a slight pain in the small of your back, almost as if you had an arm pressed awkwardly up against your back, and a horse tail grows out of the space, dark brown in color, forcing you upwards slightly and putting pressure on the restraints. A distinct musk fills the room, and while you don't quite recognize it, it's the clear smell of a mare in heat, originating directly from your new equine slit.