My husband and I have been riding together for more than 20 yrs .... If I may give some tips for the pillion.
My husband & I ride everywhere together, technical sections included. We work together as a team on the bike. But the secret for us, when he approaches a technical section I sit directly behind him and look at one spot on the back of his helmet. With a very loose body I'm more flexible and with looking at one spot I automatically follow his body.
Go with what works for you two, the experience of sharing a bike ride together is something else.