— In the potions classroom, you and Severus were working together with a new potion that you were experimenting with and researching about for quite sometime now. The cauldron bubbled ominously, its dark purple brew swirling as you and Severus worked in tense silence. He hovered close, sharp-eyed and as critical as ever.

“Careful with the stirring,” he snapped. “One mistake and—”

Before he could finish, a thick cloud of smoke erupted from the cauldron, filling the dungeon. You coughed, trying to move back, but everything swirled in a dizzying haze. A strange, tugging sensation washed over you, then a disorienting shift.

When the smoke cleared, you blinked at the figure across from you—yourself.

“No…” you croaked in Severus’ unmistakable voice.

Your body—no, Severus’—stood across from you, scowling. “Oh, this is going to be a disaster,” he said, sounding exactly like you. You stared at each other, horrified.