A guide to negotiating a covid 'bubble' with other people

In some places, “double-bubbling” is becoming official policy: households are being encouraged to buddy up for the sake of variety and mental health. But negotiating to become part of someone else’s intimate circle in the midst of a pandemic is fraught with dangers both medical (what if you inadvertently infect one another?) and social. (What if you have a falling out? Whom do you pick? What if they don’t pick you?).