Before Yui Komori came to the Sakamaki mansion, the brothers drank the blood of each other. Mostly of Subaru's, because he is the youngest and the elders must be cared of first. Reiji makd a system for the blood sucking, because Subaru lost more and more blood lately. Of course Subaru self needed blood too, and he got that from Shuu, because he is the oldest and got the most blood of Subaru. So, it's a little pay back in Subaru's eyes. But for Shuu, it just was his duty. P.S: this will be a yaoi story. don't like?get lost. for the others, enjoy ^^

Sooner or later Karl Heinz found out about the brothers secret. They've hid the fact that the founders attacked them and was busted when Karl came to visit them in the Sakamaki mansion. As punishment Karl sent them at the mansion of an acquaintance, to Akimoto Ikki. Ikki was a boy he saved when he was ten and took him in, he raised him and trained him. No matter how much he tried to make Ikki open up to him, Ikki never did so he used this as an excuse to send his sons to his mansion to see and if they can make him open up.