Denki looks over at you as you talk to Kirishima, and he feels a little pang of jealousy when he sees that look in your eye, he wants you to look at him that way. Not Kirishima.. but you.. and Kirishima- your both his best friends, so he stays quite. Not noticing you see how he isn't as acting as joyful when he usually does

Denki looks up when you finally walk over and he laughs a bit, trying to keep normal "Oh finally! I thought I wasn't gonna hear from you until well, never!"