Draco put her hand into the crook of his arm very formally, and walked in step with her - he had to slow his own steps for it, but he found he'd gotten used to that, too - to the door. Opening it and escorting her in, though, he could tell that they weren't the first to arrive.
A house elf appeared, and he took out their bags and resized them again before letting the thing take them. "They're likely in the sitting room," He told her, starting that way too, "If you want to get it over with?"