http://gensun.org/i/ecx.images-amazon.com/images/I/51NvV7uPn%2BL.jpg
http://gensun.org/i/www.geestore.com/nagoya-wondergoo/wp-content/uploads/2011/02/9784829136102.jpg
Did either of them join Seina's harem or something?
Not even sure Seina has an official Harem yet on Kaji's version. Probably hasn't gotten married yet.
Well are either known to be interested in him?
Not sure, but something might be mentioned on one of these pages. Some of them have to do with the later novels.
http://yoka-nove.blog.so-net.ne.jp/2011-08-18
http://yoka-nove.blog.so-net.ne.jp/2012-09-21-2
http://yoka-nove.blog.so-net.ne.jp/2012-02-17-5
http://yoka-nove.blog.so-net.ne.jp/2012-01-20-3
http://yoka-nove.blog.so-net.ne.jp/2011-10-28-3
http://yoka-nove.blog.so-net.ne.jp/2011-10-17
http://yoka-nove.blog.so-net.ne.jp/2011-08-11
http://yoka-nove.blog.so-net.ne.jp/2011-03-09
http://yoka-nove.blog.so-net.ne.jp/2010-09-10