You saw dark brown fur starting to creep up your body as your hands and feet started to meld together and harden into hooves. You tried to cry out, but only a loud whinny came out as your body started to transform and bulk out. you hadn't expected this to happen as your clothes were starting to strain against your body that you had no idea what was going on.
stumbling over your transforming feet a bit, You still ran forward as you made your way to the mirror that you let out a loud whinny of surprise. Your body was already half covered with a nice coat of brown fur as you managed to force your pants off, but gasped in surprise to see something was wrong. instead of seeing your previously medium sized cock growing massive and more horse like, you find it gone as you find a pair of horse nipples...
"ohmygod!" you wanted to yell out, but instead a loud neigh comes out as everything was starting to make sense. you were not just turning into a horse, but turning into a mare. you took the wrong pill by mistake!
quickly as you could that You tried to get out of the rest of your clothes, but they just tore apart while your chest barreled out. Your face pushed out into a muzzle as your ears migrated to the top of your head. You felt your spine and legs adjust themselves that you quickly fell forward onto all fours as your neck was getting longer when soon your new black mane formed over it.
completely shocked as you neighed and shook your head that your transformation finished. you were a full bay mare horse that you quickly soon felt the same urges as one. you wanted a strong stallion to mate with, but wanted nothing more then to turn back that you knew your girlfriend would be here soon as You just had to wait for her.