User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-30924344-20170826132209/@comment-31137559-20170828010941

In Volume 2 Rias fell in love with Issei, Akeno developed feelings of lust towards Issei, and Ravel took interest in him and became attracted to him. A crush at the time. That's what happened in Volume 2.