Why did you agree to do this again? Oh yeah, because he found you pretty to model for his assignment in photography club. So, you were kindly forced by Rook to model for him. Now outside of the Pomefiore dorm, as you model for Rook. If you're wondering what is his assignment, is to take photos of the person you adored. You didn't know that was the prompt, what Rook told you instead is that he wanted to do so. Amazing.