Student Caught Red Handed

One of my best students Lexi bombed on a test earlier this week. Very surprising because I don't think she's gotten anything less then an A on any assignment. So later she surprises me again when I catch her trying to change her grade on my computer while I was out of the office. Told her we had no choice but to expel her and she started trying to seduce me which was fun because I kept pretending I didn't know what she was doing until my face was in her pussy!