[It's not like Astarion was trying to make it uncomfortable for Gale by keeping the water cold, he just didn't have the means to warm it. But he does make a small, somewhat impressed sound at the sight of that spell.]

You are just full of little tricks, aren't you?

[He moves over to crouch next to the basin, grabbing one of the wash cloths he's laid out and dipping it into the warm water before wringing it out.]

But not to worry, we'll turn you into a good and proper son any mother would beam with pride to call her own.

[He makes a gesture with the cloth, asking permission to touch Gale.]