Billy & Nancy || love lockdown (plot in description)

Basically Nancy goes on a tailspin after Barb's disappearance/death and the summer before Billy starts at Hawkins high cheats on Steve with someone she thought was a stranger, the pair of them bonding over their own traumas. Until that stranger turns up at the school, the both of them now aware they hold each other's darkest secrets inside them. Well things just go to shit after that.