It's wrong to hog all of someone's food.
Kristen is looking in the refrigerator.
Kristen wants something to eat.
Kristen takes out a bowl of leftovers and only eats as much as she needs to feel full.
Kristen takes out a bowl of leftovers and decides she might as well finish it off.
When Kristen's mom gets home from work there is still enough leftovers for her to have a meal too.
When Kristen's mom gets home from work, there's nothing left for her to eat.