Akatsuki & Ruka

this is the relationship between Akatsuki Kain and Ruka Souen. Although it has not been stated, it is quite clear that Kain has feelings for Ruka. He asks her to dance with him during the ball while she turns him down, saying that she would not dance with anyone but Kaname Kuran. After Ruka realizes why Kaname holds feelings for Yuki Cross, her jealousy subsides.