Turning Pen Blank

ok so im doing this assignment where theres a short excerpt from a story. and i need to write a totally different story but using the same format as in the short excerpt.
This is the sentence from the excerpt:

I pulled out the broom and tore out a batch of straws and tossed them into the fire
and watched them smoke, turn black,
blaze, and finally become white wisps of ghosts that vanished.

This is what i have so far:

I picked up the pen and pulled off the cap and laid
the point on the paper
and watched the ink overflow, become black, _______________________________________________.

Please help me find a way to replace those words in the sentence above, and place it in the blank above.