The more Cass flirted, the more uncomfortable The Professor Man looked, and his eyes kept darting to her like he thought she was going to protect him, or something. But then he finally called her Cass's girlfriend, and she finally understood.
Looking at Cass a moment, she burst out laughing. 'Oh, darling, I'm not his girlfriend!' she exclaimed, looking back at Terry. 'We're just really good friends! No need to protect me from his flirting ways....' She winked at Cass. 'I enjoy watching him work, in fact,' she admitted.
'Friends with benefits, of course. Have been since school, really. But never serious,' she assured Terry.