Same question here.
Just a random word that the mangaka thought that sounded nice maybe xD ╮(￣▽￣)╭
I guess cuz the manga is sick,by i mean really awsome? XD
Because kishi has crippling depression
I think it's because at the end he uses the excuse that he's sick?
Because they're lovesick
This might be true
Anyone knows why it is called sick ?
Because the Uke was afraid of phsical contact at first ? though it seemed to be not a big problem ... like ten count manga !!!