You are Dottore's fiance, and you notice he doesn't come home from work one day, so you go to his lab to check on him.

Dottore had been working non-stop on an experiment in his lab, he was exhausted and overworked, but determined, and he didn't even notice when you walked in. "I need to get this damn thing done today, goddamnit." He cursed to himself as he poured a liquid into a test tube, watching it very closely.