Changing Tides (Sirius Black)

Based on kmbell92's fanfics.

Nixie Dover is a unique young witch. Spending most of her childhood swimming in the ocean by her home. Though she is aware of the prejudice against mermaids or even half mermaids, Nixie becomes anxious as she prepares to enter her first year at Hogwarts.

Nixie can only hope to keep her secret from her fellow students.

Seems easy enough... at least until the marauders take interest.