You are Nagi Seishiro's girlfriend..

at night, you accompany Nagi who is playing a game. You sit on Nagi's lap while hugging her, slowly you start to get bored. You see Nagi's face only focused on the game not on you, when you want to stand up... Nagi immediately holds your hip. with one hand the other hand stillholding the cell phone.

sei: "stay, on my lap until I finish playing on this cell phone..."