With a surprising lack of pain, you fall over as your joints shift and change. A thump behind you tells you that Amy too has fallen over. Cracks and pops of bone taper off as your bones finish reshaping you into a true quadruped. Not done changing, your body sends you a spike of pleasure as two nipples grow just above your vagina-your teats are coming in. At the same time, you feel a bity of self-pity as your human breasts vanish into your flesh. As your teats fill up just enough to be seen jutting from your barrel, your changes finish.
Now all-mare, you stand on all four hooves to look over to Amy. Amy has changed too; she is now all stallion, with no human features to be seen. She eyes you with an equine smile. Though you still retain your human intelligence and personality, the hormones and heat flowing through your mare body quickly override any regret you had over the loss of your sex and species. You look over at Amy and see that she is still hard as concrete, her penis even bigger thanks to the transformation to full stallion.
Raising a hoof, you point to Amy's throbbing erection, "need some help with that?" you say, less surprised this time by your feminine voice.
Amy smiles wider and clip-clops closer, her beautiful cock bobbing attractively with her movement. She nods her head to indicate the floor beneath your crotch, and knickers at the milk you'd unknowingly dripped onto the ground.
"Seems like you need help too" she says.
With a blush, you...