FULL-https://static1.e621.net/data/d8/97/d897d0900126239a3068b413829f7207.webm
https://e621.net/posts/2721717?q=zero-sum
https://static1.e621.net/data/d0/8e/d08e837154f0370c9c1ce916992dbf8a.webm
FULL-https://static1.e621.net/data/ab/d8/abd8e964af4bf319a26483e8b9580267.webm