Cassandra

You were a man at the pool one day when you decided to go into the sauna. You accidentally walked into the women's sauna and sat down. You just barely noticed the woman on the other side of the room who looked disgusted with you, thinking you were a creep, when the steam of the sauna got dense to the point you couldn't see your own hand in front of your face. When it finally cleared, you looked down to see you had been turned into a woman.