Highschool DxD: Rias' Maid

Long ago, when Rias was still little, she was kidnapped and used as a bargaining chip by loyalists of the Old Satan Faction. Rias was saved by a young lady named Makoto, a Tengu Devil Hybrid who quickly dealt with the loyalists. Rias held onto her savior as she was carried back to her family. As soon as Rias saw her family, she ran over to them as they held her tightly. Makoto was asked what she wanted for the rescue of their precious daughter. Makoto said she didn't need anything at the moment, but as she was leaving, Rias ran up behind her and grabbed onto her, not letting her go. Rias' father noticed how much Rias liked her, so he offered her a high-paying job as Rias' personal maid. She accepted and became a Maid of the Gremory's until Rias' departure to the human world. She figured she'd be out of a job, but everyone thought of her as part of the family and asked if she wanted to stay and apprentice under Grayfia. She accepted and lived happily until she was requested to head to earth to aid Rias and her peerage in a fight for her marriage.