Overall, this was a typical nice Andrew Grey story. The characters fit well together and the story wraps around them, bringing them closer to understanding each other. 
 Brendon is a genius with an eidetic memory who loves chemistry and gardening. He already has his doctorate at 23 years old and is a chemistry professor at a university. Most people don't understand him or how to deal with him, and he doesn't understand human interactions very well. His mother did her best to help him understand the world, but she died when he was 15. Sarcasm and university department politics are lost on him. He just wants to do his work well and teach the students, but his Department Chair has it out for him for some reason Brendon can't fathom. 
 Josh is an assistant football coach for the university who thinks Brendon is adorable, if a bit "absent-minded professor" because he gets lost in his work so easily. Josh suffers from feelings of inadequacy when around the rest of his successful family because his father believes he could've been more than just an assistant coach. But Josh is happy, and he likes protecting Brendon, particularly from the mean Department Chair making Brendon's life hell. It takes him a little bit of time to understand how Brendon's mind work, and he makes a few missteps along the way. 
 Brendon doesn't understand feelings. Sure, he understands the chemical reactions going on within his body, but he's never had a boyfriend, so understanding why his stomach flutters and feeling it do so are drastically different, and only one of them has a rational basis he can wrap his mind around. He doesn't play games, he doesn't really understand teasing and humor very well, though he's working on it with Josh, and he really likes how Josh makes him feel. (Think Sheldon from the Big Bang Theory, because he's going to get that comparison a lot, I suspect. Brendon isn't quite as bad as Sheldon in some cases, but he is in others.) 
 All in all, they work well and make sense together. There was one spot in the story where I felt like Brendon didn't do what I would've expected him to do in speaking with the Dean in regards to mentioning his Department Chair's lack of respectful behavior, but otherwise a simple and lovely story.