Can have consequences, such as spontaneous grabbing of the head and savage thrusting into the mouth, leading to potential teeth scraping injuries, possible gagging and dirty looks exchanged for weeks to come. However, the male should remain blameless for his reaction, as inexpert slow jobs are a form of torture, and not all men are trained to deal with that.
Slow jobs should only be attempted by those capable of making scenario A a reality, or those fully prepared to accept the aforementioned consequences of Scenario B.
"I had the worst slow job last night! She said she was going to give me a BJ, so I thought I'd have cum by the time NCIS started. But no. It went on and fucking on, and I got bored and grabbed her head to finish it quicker. She bit me and called me a prick. Worst slow job EVER"