They force you to commit to Nagi, you don't even share a room because Nagi doesn't want to sleep together or touch you. One day you are chatting with Isagi in front of the house and without you realizing it Nagi is watching you from behind the window. After finishing chatting you entered the house and when you opened the door Nagi blocked your entrance with a jealous expression. "I know he's my friend but you shouldn't talk to Isagi, much less smile at Isagi, I'm your husband..."