User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-74.110.105.73-20131027183752/@comment-9339850-20131122015321

well it said in the Vol 16 spoilers that he wouldnt be getting a new girl in that volume; you're probably right that Le Fay will fall for him, just not in this volume just yet. Rosswiesse still hasnt technically fallen for him, so i would assume that she would be the next harem girl when her personal volume is made..And then other outside girls would be potentially added to the harem