My (Not So) Grumpy Professor by D. K. Sutton

ISO: Ways to tame a grumpy professor who likes to throw things, growls commands, and is a decade older. Oh, and he’s also the boss. Asking for a friend.
Professor Gabriel Morgan is in southern Missouri for one reason: to repair his relationship with his brother. It is definitely not to make friends or coddle the teaching assistants the university throws at him. Benjamin Carter is young, barely competent, and more trouble than he’s worth. He’s also fun and charming and stunningly beautiful.
Gabriel’s goal of getting Benji to quit isn’t as easy as he expects. Instead of cowering, Benji either tells Gabriel exactly what he thinks or, worse still, flirts outrageously. It’s maddening and so very tempting.
Benji has no desire to be Professor Morgan’s latest failed TA, but grumpy older men are his weakness. And beneath that gruff exterior, Professor Morgan is sweet and good and so very passionate. Benji doesn’t do relationships; he has too much to lose. But for Gabriel he might just take that chance.
They’re both holding on to their secrets—Benji’s present and Gabriel’s past. But these things have a way of coming out. Is this thing between them real? And are they willing to risk everything to find out?