Direct eye contact.

Jonathan who had been trapped in a woman's body for almost six months now & who could take being a woman no longer decided against his better judgement to steal another man's body and leave him trapped in his like the woman had done to him.

Which meant Jonathan had to do something he had not done yet. 

He had to give a man a blowjob whilst keeping direct eye contact as it was the only way to initiate the sole swap.