Very fun, a piece of work which involves two ancient Japanese sex customs: "夜這い" and "筆おろし".
Talking about the tag "netorare"... In the story, the people mentioned that it is a custom for the male to sneak in other people's house to have sex with the woman, and the man in the house also went to another house to have sex with the widow there. It seems that these actions were permitted in the culture of the village. Is it still count as netorare?