Demyx hadn't exactly had experience with anyone who was so uneasy about kissing men. People that were uneasy about kissing in general, yes, but as he hasn't had exposure to such a person, the fact that Klarth is, goes rather unnoticed. He knows that something's different, but not quite what. Once he thinks that he has the information he wants, and Klarth seems to have calmed down enough, he goes back to his more standard state of being.
[Action]
"Well, yeah- it's the curse."
[OoC: Ahh, good to hear! And no problem.]