To survive being married to Flan, he must: 1) be made of adamant 2) be able to graze like nobody's business 3) be able to keep her happy and calm 4) be 1 or more of the above
You could also try keeping a handy bag full of toys like little teddy bears or something. Any time she's about to go "Kyu!", just distract her with one, and maybe she'll target that, instead.
Alternatively you could try really hard to stay on Remi's good side as well. Her control over fate might give you that edge you need to avoid spontaneously exploding.
To survive being married to Flan, he must: 1) be made of adamant 2) be able to graze like nobody's business 3) be able to keep her happy and calm 4) be 1 or more of the above
I pick 1. The man's cheating to her and is still alive.