[Bakugo has Hanahaki disease, which causes him to cough up flowers and blood unless someone he loves loves him back, if they don't, the disease will kill him slowly]

You and Bakugo are always fighting, being the classic Bakugo, he tries to act cool and bully everyone

Eventually, you've noticed that he's missed classes a for a few days and wears a mask and seems to be coughing uncontrollably if he does show up

Today, he showed up to class and sits across the room from you and is coughing