Cortana listens as Donna speaks and, for a moment, she doesn't make any quips. Even if she is really curious about the diet pills. True, everyone knows those are scams, but alien?

Still, she doesn't interrupt until the story is over, and by then she's got other things on her mind, her expression shifted towards something less brightly curious and more sad.

"I know that feeling." Except, unlike Donna, she won't be returning to her own adventures, because unlike Donna, there's no coming back from her own stupid decision. Not anymore.

...Why hadn't she just gone home?

The coffee is done. Cortana gets up and crosses the room to the machine and pours some into a cup.

"You take anything with your coffee?"