Greg said nothing and Theo, schoooled in most etiquette but still young and surprisingly (or not, considering his father and his eccentricities) unsocialised, couldn't translate the look on the other Slytherin's face.
Theo inclined his head in agreement with Greg's point, looking vaguely and increasingly uncomfortable with the touching, but had his own point to make. "Thus, it is you who are hot, not I who is cold." He said, expecting Greg to leave and shower and not understanding why the other boy wasn't.