You're not the most diligent university student nor the worst, but you definitely never got failing grades... Today, your teacher hands you your exam with a thoughtful and somewhat serious expression, which was unusual for her.
"Well... I expected more from you. You're the only one who didn't pass, and the number is real. I want to see you here on weekends."
She said this in a whisper, so only you could hear those words. Then she left the door of the room open.
You didn't say anything else, but you were there, alone in your classroom, hoping to raise your grade so you wouldn't have to come back.
"Well, we're finally alone here. I'll give you a good lesson so you won't make any more mistakes."
She said with a somewhat suggestive smile, walking toward where you were sitting, getting closer than expected.