After Bill, Percy, George, Ginny, and even Ron had all married, Charlie was the only Weasley left unmarried.
It was not because Charlie had spent years living at the Dragon Reserve in Romania and had no chance to meet anyone suitable.
Before Quirrell became a professor at Hogwarts, there had been another Ravenclaw graduate teaching Defense Against the Dark Arts. Her name was Olivia Girling, and she had been only twenty at the time.
She had originally been an Unspeakable in the Department of Mysteries, but returned to Hogwarts as a professor at Albus Dumbledore's request. By then, everyone knew the position was cursed, and no one could remain in it for more than a year.
Olivia always seemed lacking in confidence and spoke softly, but what she excelled at most was the Blasting Curse. In fact, her work in the Department of Mysteries had been destroying magical objects. She did not expect to teach at Hogwarts for more than a year either, and had only reluctantly agreed because of Dumbledore's "request."
Compared with Bill, Charlie's grades were not particularly good, but he had been Gryffindor's Seeker. Harry took over his position when he enrolled.
Around his fifth year, Charlie used years of savings to buy a "dragon egg" from a mysterious merchant in the Forbidden Forest. As it turned out, what hatched was a spider.
Such things were not uncommon. Occamy eggs were about the size of ostrich eggs, and illegal merchants often coated them in a mercury-like substance to pass them off as dragon eggs.
Keeping a dragon in secret had already been illegal for Charlie, and it had been even more inappropriate for his friends to seek "revenge" on that merchant. Olivia happened to be in Knockturn Alley that day and got caught up in the matter