TheTwo of Cups is traditionally the marriage card. It is true love, partnership, combining two to make a new whole.
Three of Wands is expansion, growth and long-term planning.
I can’t help but look at this combination in terms of a relationship or marriage. Here is a couple that genuinely plans to spend the rest of their lives together. They are planning for their future, and very likely, planning to have children, literally expanding from two into three.
The Two of Cups can also represent a close friendship, indicating this friendship will last a lifetime. You can put your full trust in this person, whether friend of lover. They care deeply for you and plan to be around for a very long time.