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It all started when she was assigned to be his body guard and attendant. They had a rough start, but things got better.
He stopped comparing her to her counterpart, and she started getting to know him.
They started getting closer. At first, it had been completely innocent. Friendship. But then, things took a turn for the worst.

They fell in love.

A king is only allowed to fall in love, have a relationship and marry a princess or noble woman, or at least someone related to that. Anything else was forbidden. And yet, he still picked her over everyone else.

The great king Jellal, had broken the sacred rules and rituals, and picked his royal army captain, Erza Knightwalker.