Denise made a short video on her phone—no filters, no music—of Willow and Lark on the back porch, the latter chewing a rag toy while the former watched, content. She posted it with a modest caption: "Two old souls being new friends." The video's views were small at first, a handful of likes from colleagues and strangers. But then, on a Tuesday when school canceled after a pipe burst, a parent forwarded the clip to a friend, who sent it to a neighborhood group, and someone tagged Mara.