User blog comment:B214/Question and Answers/@comment-6482575-20130717153225/@comment-79.52.171.39-20130717154346

I thinked too about this and come out with this:

first are shocked then after gain back some control ask if he was a devil from the beginning, at the answer "no" they ask how his lust convert him into a devil with one of them that say "you used some trick with Rias-sempai and the other girls" or something like that, after full explain all the situation, one of them say to Issei to organize an encounter with some cute devil or fallen angel for compensate all the "single time" they had while he was enjoying the company of the girls, in the middle they found that Rias is a devil (with the comment "she is a beauty of another world" and "Asia a devil? I think she is more an angel..." and things like that) and the others too