Double Life, the relationship is confirmed at the beginning, including dog and wolf, GGAD
I descended from Kunlun on the top of the mountain,
Just to keep this earthly prosperity.
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Severus Snape, the genius in the world of potions, the youngest headmaster of Slytherin, and the youngest headmaster of Hogwarts, such a great man of the generation, died at the mouth of a snake.
Before he died, he kissed the hand of the boy he had loved for three years and said good night to him. Everything was arranged well. Now all he needed was Merlin to pick him up. But he didn't expect that Merlin would rebel and fly him into the freshman sorting ceremony that year.
Then, the Potions Master, who we're forced to continue being a bully, discovers, wait, how did his boy end up in Slytherin? !
Purpose: I came down from Kunlun Mountain, just to protect the prosperity of this world.