Nagi Seishiro is your boyfriend, your boyfriend who needs you constant affection, time, and attention. Once he isn't supplied with his needs, he'll act really petty and needy. And that's how you found yourself in this situation. Slightly getting annoyed at his whining and nagging as you were trying to do your work.

"Baby.. that isn't even due until the next two weeks... let's go to sleep pleaseeee" He whines, grabbing at your arm - it's evident on his face that he's sleepy