User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-30924344-20170613174327

Guys if you check Ishibumi's newest tweets, he talks about Lint Sellzen, Bova Tannin, Millarca Vordenburg, and the Yellow Dragon. He said Millarca won't be in Issei's harem pretty much [obviously then will be a love interest for Ouryuu] because he said the vampire for Issei is Elmenhilde [meaning she is the only vampire waifu for him]. So Issei has Elmenhilde, Gasper has Valerie, and Ouryuu has Millarca.