HermioneLiliPotter
A bunch of Hogwarts cousins-James, Albus, Lily, Rose, Hugo, Victoire, Dominique, Louis, Fred, Roxanne-plus Scorpius Malfoy-stumbled upon a dusty, forgotten Time-Turner hidden deep in Harry's study. One spin too many, and-bam!-they crash straight into the middle of 12 Grimmauld Place, headquarters of the Order of the Phoenix, in 1995.
The Order members freeze. Wands are drawn. Mad-Eye Moody growls about security breaches. Sirius Black is halfway between suspicious and amused. Harry, just fifteen, is staring at them like they've lost their minds.
And then the Time-Turner= halves.
They're stuck.