He felt faint as she expertly finished him. His concentration, his universe, coned down to the sensations she was providing. His awareness contracted. He was graying out. This was like seeing an old television set turning off.
Then, she did SOMETHING and the pleasure hit him with more force than a human could take. As he came, his mind shot up the pleasure scale, he transcended any understandable scale of pleasure. His mind ascended up, and up and up - then, in an absolute euphoria - he lost consciousness.