Kiyona Carswell and Alison Wynn’s relationship status remained casual for years until a series of coincidences, accidental run-ins, and a precognitive vision brought them closer together.

It took Samantha Weinstein and Philip Della Noce a few years to form a friendship, and another few more to become romantic.

Catriona Duncan and Sarah Palmisano, who met through Tinder, had their first date almost five years ago at the taping of the NPR game show “Wait Wait … Don’t Tell Me!”