Fics like The Lady of Castle Grimm

As an omega rescued from a life of drudgery by King Albus Dumbledore, Severus understands the intricacies of debt and repayment. When he is promised to Sir Sirius Black, one of Albus' most loyal knights, he knows that he is only being put to his highest and best use. All he wants is to live his life in service to his king. Too bad Sirius seems to have developed feelings for him.

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