Downloading Hitting the Books
A young man (age 24) returns to his old school to teach and attempts to pursue his old history teacher.
Rated M, 12.6k, cis M/M. A man returns to his old school to teach, and also returns to his old school crushes.
Obviously there's a big age difference here and a teacher with his ex-student, oral, some implied BDSM, some daddy issues, some sex at work, et cetera.