Primary and foreign key question

I am fairly new to access. I am building a database which has the potential for two buyers on a single transaction. I want to assign a primary key to each customer. Is it possible use the primary key of each customer within a single transaction and create a relationship.

more simply:
1 table holds transaction
Transaction ID: Buyer 1 ID: Buyer 2 ID


Buyers:
Buyer ID First Last ...


The transaction table will pull from the buyers and hold a 2-1 relationship