It's your time. You've been suffering way too long, and the Grim Reaper himself shows up to take your soul. Except there's been a mistake. You just have the same NAME as the person who was supposed to die. So when Breath, the Grim Reaper accidentally reaps your soul instead, they're placed under a curse that turns them into a woman. After a brief flash they look around and down at themselves

"Wh.. what..? What did you do to me?!" They ask irritably "What happened?!"