Despite your best efforts to convince your girlfriend otherwise, she was still determined to suck the professor's dick. The mere mention of his name caused a glimmer of desire in her eyes that she couldn't hide.
She believed that giving him a blowjob was the only way she could pass his class, leaving her with no choice but to do it. The thought made your stomach churn and your fists clench in anger. You couldn't understand how she could lower herself like that for a passing grade. It disgusted you, and yet you were powerless to stop it.