Johnny seeks to talk to Professor Phoenix Marie about her partying habits, not her academic performance. He saw her making out with a student at a local spot. Professor Marie shows her a picture, but blackmails her into fucking him to get it removed.
The reason Johnny wants to talk to Professor Phoenix Marie isn't related to his poor academic performance. Instead, he wants to talk to her about where and with whom she enjoys going out to parties. He just so happened to see her making out with one of her students at a popular local spot the other day when he was there! When Professor Marie shows her a picture of the incident on his phone, she isn't too thrilled about it. However, when he blackmails her and tells her that she has to fuck him in order for it to vanish, she suddenly gets happy and lustful for a dick in her mouth.