Offer: Acceptance: Consideration: A promise is illusory if it can be retracted at anytime by the promisor. PER Parol Evidence Rule Evidence of a consistent additional term is admissible to supplement an integrated agreement unless the court finds that the agreement was completely integrated. An agreement is not completely integrated if the writing omits a consistent additional agreed term which is agreed to for separate consideration.” See Rs. 2d § 216 (1), (2)(a). “Where there is a binding completely integrated agreement, even consistent additional terms are superseded if they are within the scope of the agreement. A separate contract, not covered by the integrated agreement, is not superseded.”