In July 1978, a distraught Petunia Evans and devastated Severus Snape stumble upon each other. The childhood nemesis share some drinks, pour their hearts out to each other in their drunken mindsets and spend a night of passion and comfort together. They declare it a mistake on the next day, try to forget it and move on with their lives. But just one night can change everything. Slow burn, Long fanfic