OC has Hanahaki...

Scenario 1

Crush happens to walk in on OC coughing up petals. Now, they had noticed OC had been acting off for a while, but now they knew why.

Scenario 2

OC is hiding it, what happens when Crush finds them unconscious surrounded by petals? They take them to the infirmary and learn what is really wrong. They end up waiting for OC to wake up.