She'd been prepared to tell him 'no', but then the dog showed up. A dog she, also, had not ever seen before. Surely nothing so white as that dog could be a stray and look so undirtied by the city streets. But Papyrus' reaction was even more confusing, and Eileen was getting the distinct impression that there was something else going on here.

And then... off he went. After an unholy screech. And while part of her wanted to just ignore the situation and move on with her life, she couldn't shake the feeling that, while not immediately dangerous, leaving well enough alone would only lead to trouble.

And thus she took after them both, a flash of black to accompany the two flashes of (mostly) white.