Note: Concept taken from Chyoa, but the characters and storylines are yours to make and choose.
At the counter of the grocery store, there was an assortment of items to choose from. Lollipops, mints, chocolate bars - all small things that could bump up the total of a shopping trip.
And it was today that someone would take it. The customer in question had forgotten their credit card today and didn't want to deal with the stupid machine spitting back change at them. All they needed was something just 50c. They scanned the shelf, and there it was.
They picked up the pen. Bargain! it said. Magic Marker. Writes on any surface. Transform your life in just a few words! And most importantly, it was only 50c. So, the customer shrugged and put it in their basket. At least this would give them more use than a chocolate bar. They paid for their shopping without the machine malfunctioning or getting stuck giving change, and drove home without thinking about their purchase.
It wouldn't be until later that they would find out the truth about the marker's magic.
Anything that is written on with the marker will be transformed according to its words.