It is the 9th House that describes your 2nd one.
So say you’ve got Capricorn in the 7th – you hook up with a driven warrior type.
Pisces in the 9th? But then later you run away to Africa with a poet & a Masai Tribal Elder marries you.
Not talking marriage? That person (or people lol) are described by your 5th House. Clandestine sexuality partners? The 8th.
This sort of ye olde astro is fatalistic and a bit limiting but fun to ponder, no?
Image: Piotr Frolov