Professor for Two: An M/M Erotic Short (Professors #3)
Silvia Violet

Chemistry graduate student Sean Carson’s favorite form of procrastination is fantasizing about his office mate, Ben. When he learns Ben and department hottie, Dr. Stevens, are sharing a lot more than research techniques, Sean is too turned on to be shocked, even when they invite Sean to join them.
Check out the other stories in this series:
The Professor's Desk
Professor for Dessert
The Professor's Rent Boy