Snape's Unwavering Devotion to Lily

Snape meets with Dumbledore and insists that his protection of Harry is only because of Lily, not because he cares for the boy. He demands that Dumbledore never reveal the depth of his feelings for Lily. Dumbledore solemnly agrees, impressed by Snape's steadfast loyalty and sacrifice. Snape's Patronus, the silver doe, serves as a final testament to his undying love for Lily.