If we can make this a mutually beneficial transaction, I will keep purchasing a large quantity of OO from you. As I have many customers who want OO in Japan, I would love to establish a business relationship with you.
If this transaction will turn out to be profittable for both of us, we will continue to purchase a lot of xx from you. We have a large number of customers for xx in Japan, and wish to build up a good relationship with you.