User blog comment:B214/Volume 17 spoilers./@comment-1359322-20140224074737/@comment-24468758-20140224094123

Two Great Onee-sama for the win!

The only reason why Asia is still considered 2nd could be because she always sleeps together with Issei, but other than that Akeno took over the second position long ago as she is the only one able to stall Issei's movements with sexual stimulation alone except for the legal wife but Rias is unrivalled.