Disciple of darkness

Christina Kovalenko has always been an unusual witch. With a pureblood background and a passion for studying dark magic, she was constantly on the line between light and darkness. A difficult relationship with James Sirius Potter, Harry Potter's eldest son, only complicates her life. Constant quarrels and misunderstandings alienate them.

But how far will Christina go to find her place in this world? And will she be able to save herself without losing her loved people? A story about how choices made in youth can determine the fate of not only one person, but the entire magical world.
P.S: English not my native language