It was the last day of testing for the class of 1978, something had to go wrong. The slip of a knife and the soft plop was the beginning to a chain reaction that would alter the summer for forty seventh year students. One of Peter Pettigrew's bat wings slipped from his grasp, skittered across his work bench and sailed across the gap and into Narcissa Black's green bubbling cauldron. Miss Black backed up hastily into Hestia Jones' simmering cauldron, letting the contents fly into four other students NEWTs assignments. There was a loud curse coming from the direction of the Carrow sister and a "James put me down!" from Lily Evans.
The mixing ingredients and half finished potions knocked out all twenty-five students in the hall and the fifteen waiting for their Charms NEWT in the Great Hall. The Ministry proctors (who hadn't been briefed properly about catastrophes of this kind) had placed wards around themselves and watched the catastrophe unfold.
As smoke cleared and students started to wake up, Headmaster Dumbledore watched from the head table, his bright eyes twinkling behind his half moon spectacles. It was most delightful to finally see Slytherin's and Gryffindor's casting their house loyalties aside to win over one another's affection. Hufflepuffs were whispering sweetnothings into the ears of Ravenclaws, and was that Sirius Black stripping his robes to flex for a blushing Helga Byrne?
The Headmaster stood and stroked his long beard. There was no way he could send the Seventh Year students home, love struck and longing, to parents who wouldn't understand. Deciding that this mishap must be fixed under his watch, headmaster Dumbledore invited the seventh year class to spend the summer of '78 at Hogwarts until select group of staff members and ministry officials found the reversal for the potion.
Wouldn't it be perfect for the fighters to become lovers with a war looming? With this thought in mind, Professor Dumbledore smiled to himself and deemed this summer