Yeah… It’s pretty obvious to draw something like this.
 
But here’s a story that I came up with:
 
One day, during the science class in the labatory. Gallus was doing some-sort of a lab-prank to Smolder. However…  
Gallus made a youth potion that he will use to prank Smolder.
 
He threw the potion to Smolder and it worked. However, he his affected by the potion too.
 
I’m not sure If I could write the rest but… I’m tired to think right now.
 
So I’m gonna let you all continue the story in the comments.