User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-84.128.160.216-20130928194142/@comment-79.7.180.251-20130928212914

No, Issei is Kiba's best friend (and Kiba thinks to be the best friend of Issei.XD).

They have many things in common.

almost all schoolgirls love Kiba-almost all girls of rias peerage love issei.

Kiba want become the strongest knight, Issei the strongest pawn.

Issei's rival is Vali, Kiba's rival is Arthur (a vali's comrade)

They are the person that make feel better the girls of the group, Issei with his personality and love, Kiba with his determination.