Smile For Me (Student/Teacher)

Diana Apollo was a straight A student, and never really had to work hard for it until Mr. Grant came along and became her Advanced Calculus teacher.
He was the handsome teacher who everyone feared. Nevermind his looks, he treated Diana the worst. Giving the innocent eighteen-year-old pointless detentions and cancelling her secret tutoring with another teacher, just to see her suffer.
Trying to maintain a perfect grade in calculus AND keeping Mr. Grant off her back was impossible, it was either one or the other.
When Diana has no choice but work hard to keep a perfect grade, Mr. Grant starts to show up in her life much more than usual.
When she really meets the real him, will she be able to start trusting him? He was her teacher...But there must be more to it.