User blog comment:B214/Volume 23 discussion blog/@comment-177.177.111.64-20170425170658/@comment-1359322-20170426000357

Rias started off as an older sister figure for Ise. Asia started off as a little sister figure for Ise too. So no reason to why it can't apply to Vali. Either way we aren't the one to decide this. Ishibumi is. If Ishibumi wants to push Vali & Lavinia togethere then it'll happen. If he doesn't then it won't. But seeing How Ishibumi added the interaction between Vali & Lavinia in Vali's volume there's a high-chance that it would occur.