Ah! I'm so excited for your hp!jinkook!
Some of my fave wizarding tropes include:
- spells or potions gone awry (cursed to speak the truth or literally becoming stuck together).
- Seokjin's amortentia smelling like JK's laundry detergent :)
- animagus (JK as bammie?) or patronus animals
Most of all, I love the feeling of adventure and mystery with their Scooby gang of choice. I'm sure your writing will be wonderful as always!