Tsetse has had enough of how things are run in the Changeling Kingdom since their defeat, and plans to change things.

Needle always wanted to work in sciences, and so when he got a request to work at a well-known laboratory he was quick to accept. What he didn't realize was that he'd be working in the sex-based experiment sector... and he'd be experimenting.

it started when sweetie belle went missing- she was the youngest of the victims. then there were other mares who vanished.