Despite the fact that they didn't really solidify their getting-together until season three (and did so under relative duress, having just escaped Russian captivity), Joyce and Hopper's relationship reached power-couple stage long before they locked lips.
Hawkins' two most supernaturally involved adults (not a high bar) showed by season three that they were able to work remarkably well together. Hopper's apparent death, however, obviously threw a wrench in things — that is, until Joyce received word that he was alive in Russia and dropped literally everything to attempt to rescue him.
Still, by the time that "Jopper" finally shared their first kiss, it felt like they had earned it. Joyce and Hopper pretty regularly kick ass on "Stranger Things," and went through no small degree of hell to get back together.