It went strong until the hero and the wolf girl married him... I mean it really looked like the dragon girl would have been the wife while the 3 small girls were like his little sisters and/or daughters and the hero was just a recurring friend character, the wolf girl was a folower of the big wolf familiar and the sheep girl was curious about him but no. Also, a pretty late introduction as a harem... i think that makes it a bit worse, that you are under the presimption that it would be 'dragon girl best girl' and suddenly boom 3 wives