In Servitude to the Dark || Tom Riddle

When Tom Riddle, of the diary, senses the dormant horcrux in Aster's scar, the two soul fragments merge to create a phantom being named Marvolo. Marvolo is stronger than any single horcrux, but still has to depend on the diary and Aster's magic to exist. Instead of becoming enemies, Marvolo takes Aster under his wing, protects her, even cares for her, and trains her to be the perfect servant of the Dark for when Voldemort returns.

[fem!harry potter x tom riddle/voldemort]