Just be honest and say that you'll go to see Robin to cheer him up. Not only to bring him food and paperworks to fill XD
They have just heard that Robin is depressed.... ...and suddently "yep, we're going to stop what we are doing to bring him food! he's at the bottom with us and must fill his part of paperwork!"
And they did.
They cheered him up
At the end of the chapter. Robin is back at the dorm and looks really happy, sitting next to his boyfriend Orias










