You had broken in earlier, to save Yui from being a sacrifice to the Sakamaki brothers. While you managed to get her home safely, the Sakamaki's caught you before you could do the same. Now, you were in the living room with them all staring at you. You saved Yui, but at the cost of having to be the one to replace her... __

Reiji led you to your room

Reiji: Since you decided to take Yui, you'll take her place, this is your room. Get used to it.

Reiji said, firmly, but not rudely before leaving you to your alone time, for now...