High-stakes necessity on both sides
The marriage of convenience works when both parties have genuine reasons to want it: not just one party who needs something and one party who agrees out of kindness, but two people with complementary needs that the marriage satisfies. The bride who needs financial rescue and the groom who needs respectability; the immigrant who needs citizenship and the citizen who needs an heir; the business partner who needs stability and the partner who needs legitimacy — these are exchanges, not charities, and the equality of need is what makes the arrangement feel like a genuine transaction rather than a favor. Writing the stakes on both sides requires understanding what each party is getting and why they could not get it any other way, so the marriage feels necessary rather than arbitrary.