When the elf arrived, Draco was in his private lab cleaning up after brewing a potion for Astoria and their unborn children. He was about ready to banish the elf to Siberia when he heard the word "Severus."
"Why didn't you say so?" He asked the elf incredulously.
Draco washed his hands, demanded the elf clean the lab before sleeping on the rack for the night.
He walked into the sitting room and met Severus.
"Ah, Godfather," he shook the man's hand. "Would you like a drink?"