User blog comment:B214/Talk About What You Want! 2/@comment-24098614-20140703215208/@comment-25133405-20140703220521

In Volume 17 Issei states that he would like to have a single day to hang out with Matsuda and Motohama, so i think that implies that he still is their friend, but they don't reunite very often. About peeking, i don't think he does, because of the same reason, Issei lately isn't having time to reunite with the other two perverts. That's what i deduce from vol 17, someone correct me if i'm wrong.