User blog comment:B214/Question & Answers 5/@comment-82.199.192.96-20160305201946/@comment-26345952-20160305221911

Well look at Akeno, Baraquiel has around 6 to 8 black wings, yet Akeno has been shown (before she was Rias's Queen) to have 2 black wings at a young age, even though she is half human.

It wasnt until Vol. 12 with some braclets that were made in Grimori and given to her by Azazel and Baraquiel that Akeno had 6 fallen angel wings.

Feel free to correct me  on any errors.