Not entirely a happy ending, but one that's significantly better than the canon ending for Mayrina. This vid will show how to save Johl and Demir from the hag, Auntie Ethel.

Quest Walkthrough:
Save Mayrina Part 1
   • Baldur's Gate 3 - Save Mayrina Quest ...  

Save Mayrina Part 2
   • Baldur's Gate 3 - Save Mayrina Quest ...