User blog comment:B214/Light Novel Volume 16 spoilers/@comment-23853100-20131019035942/@comment-1359322-20131019180955

While i can understand on Sona, Abe and Bennia, I don't think Valerie and Yasaka is possible. For starters we haven't seen much interaction between Yasaka and Issei aside from Yasaka thanking Issei. As for Valerie, not sure, since Issei was basically fighting in this Volume so no flags were raised.