You had no idea that your dad was turning into a bat. You were worried. did the transformation have something to do with Dad's wish?
Suddenly, before you realized it, Dad started to shrink! He gasped, as he saw you and his wife get taller and taller. "Wh-what's... happening to... me?!" Dad squeaked, his higher voice sounding MUCH higher than before.
His clothing was rapidly loosening, as his pants dropped, and his smaller frame couldn't suport his shirt. Dad soon found himself small and stark naked. He let out a loud squeak as he covered his penis with his handsm which was suddenly gettin' covered in thin, bristly, brown hairs, and there were more of those hairs forming on his legs.
Dad tried to yell for help, but all that came out was a loudish squeak.