User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-3965848-20180426175828

Crazy thought, with Issei's wives from EX plus Kunou making up 11 of the Heavenly Breasts, my guess is the last one might be Kiyome Abe. Reason: Well with her hiatus, she's almost last girl you'd expect it to be, building a surprise twist as she makes a comeback and become engaged for real

Imagine Kiyome's father joining the other parents.