Now, Billy's tf begins.
He watched as his hands transformed from five digits fingers to three digits fingers.
Then, a short stumpy tail popped outta his pants, like with his dad.
His footwear disappeared, revealing his bare feet had 2 toes on the feet, then the rest of his clothes vanished, revealing his penis, which immediately shrunk, then disappeared, like his dad's had before, becoming a vagina.
His eyes became a cyclops eye, like his mother's, then he gained 2 blue tentacles under his arms, and then, he gained pointy ears, an extra pair if eyes, his nose pointed, and his teeth became sharp, like his dad's.
Finally, his body turned a pale cream colour, with the exceptions of his hands and feet - his feet turned lavender, like the colour of his dad's monster form's skin, and his hands turned cyan, like the colour of his mom's monster form's skin.
To finish off, black short spikes grew on his head, and his hair turned neon blue, to match his parents.
Billy and his parents were now a Monster Family!