Draco waits. And waits. And waits. He doesn't think that Severus is going to starve him out or anything: that isn't his style. He'd want to get rid of a threat as quickly and quietly as possible. Unless that's his style in this timeline, which would be vastly disappointing. He knows that if Severus does want to murder him there's no way he can win: even at a suitable age for 1980, the other wizard is strong enough to beat two or three of him easily.

So he waits. He picks up a book and he reads and he waits, anxiety gnawing at him. Still, even if he had cold feet, there's no way out. It's an interesting book and it passes the time so he deals with the passage of time that way, drinking tea. Trying to relax. Failing. The sound of footsteps startles him enough that he puts the book aside and straightens almost as though he's in class all over again.

Ah. So he is the appropriate age.

"Hello," he says, sounding calmer than he feels.