Business Law

Situation C. Forest was working on a major deal. To complete the task, he asked his assistant Great to stay late on a few occasions. Great was not required to work any overtime hours and if worked, Great was paid for the extra time worked. While working on the project Forest sent Great an e-mail, "Ive Realize how much time and effort you are contributing. If we get this deal I will give you and extra weeks pay." Forest got the deal but never gave Great any money. Great asked you, as a student in business law if Forest is legally obligated to pay the additional money.

Is Forest legally obligated to pay the additional money? Why or why not? Is there adequate consideration to bind the parties?