And then, all of a sudden, it starts - an odd, tight feeling, deep inside your chest. Any thoughts of food are driven from your mind by the feeling, as your face creases in displeasure at the odd and unfamiliar sensation. It reminds you of how your Master once described the stomach aches he used to get as a child that hurt if he straightened his body out - as you begin to bend over, the feeling concentrates inside your chest, steadily spreading throughout your torso, to the rest of your body.
You grit your teeth as the sensation grows stronger, stronger - and then you let out a breath as, all of a sudden, it dissipates. Straightening up, you shudder and stretch out, wondering just what had happened. As your gaze falls downwards, however, you gasp in surprise, blinking as you behold your chest. No longer was it completely smooth, as it had been when you were fully horse; now, there was a pair of small bumps that gently swelled outwards with every breath, each capped with a tiny pink nub that tingled deliciously.
Your breath catches in your throat as your figure slowly becomes less like a horse-turned-woman's, and more like a woman-turned-horse's. Your chest, previously a little disproportionate due to your equine biology, shrinks a little, as your new pair of breasts inflate larger. While tiny, and nothing to brag about when compared to any other female, you felt ecstatic over them - somehow, for some reason, you had become a little more like a human! There's another tingling sensation deep inside your chest, as your breasts develop from simply appealingly-shaped blobs of fat into... well, appealingly-shaped blobs of fat with a purpose, as mammary glands pop into existence, your little mosquito-bits swelling outwards a little bit more in order to accomodate them better.
The tingling sensation migrates to your behind, which, while flat as a board, still sported a layer of muscle. Your buttocks each begin to swell a little larger, a little shapelier, and despite the small amount of fat they're packing on you can tell that there's muscle, as well - more muscle than before. In fact, the whole of your body seems to be bulking up a little, as every muscle suddenly clenches, hard, and you double over - not in pain or in pleasure, but from the sudden sensation of newfound strength.
Straightening up for the second time, eyes fluttering open and closed, you shiver. Surely, Master would be able to understand the love you felt for him a little better now? As the sound of his footsteps coming down the stairs reaches your ears, you quietly squeal, feeling so happy that you begin to bounce up and down, small curves jiggling and wobbling appealingly...