User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-102.132.250.232-20190902161526/@comment-2601:87:8300:20D0:A8D5:9C8C:4D28:DF9A-20190902204606

There's no real proof and honestly I think it's better that she becomes Issei servant because if we assume by age Le Fay would be the first to die long before the other wives.