Severus Snape was not an island waiting to be redeemed, but a storm with its own thorns.
Greta Max is not the moon, she is just the person standing outside the thorns and refusing to leave.
In the deep cellars of Hogwarts, Snape was crucified on the cross of the past, building a wall of thorns with acrimony and gloom.
Until Greta appeared, she stood quietly outside the thorns, not asking him to pull out the thorns, nor urging him to move towards the light.
This stress-free companionship gave Snape a strange and extravagant hope for the first time in the long darkness: Maybe, I shouldn't die here like this.
Until the end of the war, he remained a martyr, and she was his only companion in hell. It wasn't until Voldemort died that the man who had walked in the darkness for so long was finally freed from his shackles.
This time, it was no longer the ghosts of the past dragging him forward, but the glimmer of the future that made him want to move forward.
Intention: Let the broken soul learn to shine for itself again.