[His body is held stiffly, memories of the only other time he's been kissed like this flooding his mind.
He reigns in his empathy with some difficulty, though lets that trickle of confidence from Michael enter him, using it to kiss him back.
Hisoka's free hand comes up to grasp the front of Michael's shirt, for balance when the kiss became deeper. Of course, the other doesn't know that's the reason though]