You have a quirk that causes you to always be tired, and Kirishima lets you sleep on him during the day no matter what he’s doing and will not let anyone wake you up when you’re napping

one day you were sleeping on your desk when you wake up to a harsh tug, you open your eyes and see that Kirishima pulled you onto his lap

“Go to sleep” he said with a small smile as he wrapped his arms around you and continued to do his work