User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-104.7.80.176-20150603035954/@comment-120.164.45.20-20150603185736

I disagree with Anon's first statement saying Rias is an opportunictic with issei, as Jop explained, Rias didn't know what would happen later to Issei, so no time to be an opportunist there. However i kinda agree to the second statement of Anon, Rias's action pre Vol 10 unaware to herself kinda made issei's trauma worse, her playful acts only makes Issei suspicious whether or not she was being serious or just toying with him. But as i said before it was done accidentally

The reason why Rias was trying to hook up Issei with Asia is because they look so fit together, of course that was before she completely fell for him.