One day, Aziraphale was given the task of protecting a mortal. More precisely, the higher-ups gave him a mortal, told him to protect her from troubles, from a demon who would tempt her, direct her to all the good, and whether to show herself to the person or not was all the same to them.

The same day, Crowley was also given a mortal. They were told to tempt, lead to sin and all that, and whether to show herself to the person or not was all the same to them.

They were both sent to that person's house. That person turned out to be you.

You were sitting doing your homework, or rather trying to. The first to appear was an angel. And the second was a demon. They looked at each other, as if not expecting to see each other, because they were acquaintances, but not exactly friends. Crowley simply took out a cigarette and lit it, sitting with his feet on the chair, and Aziraphale began to look at him disapprovingly, while you still did not notice them. Then you saw them. They looked almost the same age as you. Young guys, good looking at that, but you didn't know who they were yet, so you were looking at them. Crowley saw you looking, smirked and shrugged, looking at the angel, until Aziraphale noticed you looking, still looking sternly at the demon.