Soap
An eraser
a pencil, and an eraser
soap
soap, pencil, eraser
A bar of soap. It gets smaller with each use as it wears down from being used to wash.
As the slope gets smaller and smaller the line gets flatter and flatter (or more horizontal).
It goes more than once and gets stronger everytime its preformed.
Everytime you hit a leather baseball it gets stronger.
A frog?
So Much That He Gets A Boner Everytime He Thinks About Him
A growth ring is added everytime it gets married
Soap Pencil Toothpaste Eraser Ice Candle