Cold
The Dementor reached towards his godfather, gnarled grey-bone hands grasping blindly.
-No no no! Not him! Not Sirius!-
Harry tried to grab his wand, to cast the Patronus, to repel the Dementor and get it the hell away from the man who had just promised him his long-awaited family, but it was getting closer and closer, and his blood was growing colder and colder, ice freezing his veins…
And then a bright light. The Dementors disappeared, but he was still so cold.
-Sirius! Have to save Sirius-
He felt himself get heavier and heavier, his limbs leaden as his arm dropped helplessly to his side. And then his hand found Hermione's, and suddenly he was warm again.