Vertex in Synastry?!

Vertex in Synastry?

Just wanted some opinions on vertex in synastry especially persons A Vertex conjunct the Person B'sDescendant and Persons B's Vertex conjunct persons A Truen Node/NorthNode? Every thing i have found on line is very vague kinda like its a karmic relationship but doesnt go into detail.

2 months ago
I also have a grand trine in air/kite in fire with this same person.

Basically, what it means is that person A and person B had met each other at the right place and at the right time. Both their vertexes got triggered when they met. They will cause some kind of change in each other and this change will be for the better (oppositions with vertexes cause the change for the worse). These two people met each other by fate. Note, the situations with vertexes very depend on current (!) location at where these people are currently at. If one of them, or both of them, move, the situation may change.
When the vertex of one person conjuncts the other person's Descendant, very often this means marriage. Sometimes it means a very significant relationship, but most often this relationship is marriage. Also those conjunctions mentioned by you mean that if there will be problems in a relationship, they will tend to work out on their own; both people won't have to do much to work on them. If both of them cultivate the properties of the person's A north node sign, they won't face problems at all.