User blog comment:B214/Volume 17 spoilers./@comment-117.193.172.96-20140220163805/@comment-1359322-20140221012320

Issei is generally viewed the same way as the two though. -____-

Also M&M are Issei's closest friends, they have the longest relation with Issei among all his friends. Rias and the others have any right do deny much less oppose Issei of his friends even if they are his family.