i don't know clary's canon but we haven't tagged yet so this should happen...
accidental texting will probably be the best route since he isn't leaving his quarters until the 18th! my inbox is open anytime!

if you choose to message karamatsu after the 18th, it'll be after he discovers a maimed up body belonging to a passenger s-so...
he will more than likely talk about it to her if you want to start off things Intense...