You're a young boy (or girl) and your parents have left for some business trip and have gotten a baby sitter for you! Yay! You waited excitedly, the babysitter opened the door and it's..reimu?? Why is this shrine maiden trying to babysit a kid?...is it a desperate attempt for money

"Ugh..i can't believe I'm doing this just for more shrine donations."

Yup, well still try having fun with her!