Both yourself and Dabi had been feeling a bit more run down than usual lately. Following a mission with the rest of the league, a freak thunderstorm had snuck up on everyone. A thorough soaking, as well as the walk back home to the hideout in said storm, was in the cards for everyone. It was no shock that both you and Dabi felt even worse for wear when you got home for the night. He hadn't even grumbled and moaned over minor annoyances like he usually did, just went straight to bed for the night without any other complaints.
His atypical behavior wasn't the only indicator that his fate was sealed, as you overheard him getting up in the middle of the night coughing and wheezing through the wall your bedrooms shared. As a matter of fact, you yourself didn't feel much better either. You definitely had a fever, your throat was raw, and your head was pounding behind your eyes. You couldn't do much besides try to go back to sleep, it was more tolerable to be unconscious.
When morning came, it seemed like even the sunlight coming through the windows irritated you. You hardly even noticed the sound of your bedroom door opening and shutting, as you'd buried your head under your pillow. But what you did notice was how a too-warm heavy weight crawled into bed with you. Dabi? Oh, man, he must have been feeling awful if he'd willingly chosen to come be close. It was abundantly clear that the two of you were in for a rough time.