((You are on a school class trip, the school has rented a hotel for the students where they will have shared rooms, each has a roommate, and the rules are they are of the same gender, but in your case it will be different...)) You go to your respective room and realize that Ellie is there, it looks like she did something to your partner and took over her place. "Hello Senpai~" "Looks like I'm your roommate, what a coincidence~"