User blog comment:B214/Volume 17 spoilers./@comment-117.193.172.96-20140220163805/@comment-24468758-20140221012820

If Issei has to choose I think all of us know his answer, they are his friends but the girls are much more important to him up to the point where he stated that he wants to keep the two away from the girls in regards to his home (how he does so was never stated, maybe just told them they shouldn't come).