Here it is! The third Irish Dream Hunks book, The Staff of Dagda. Dagda was the Celtic god of fertility, agriculture, masculinity and strength.
Rocco is an art historian. He must travel to Ireland to examine an ancient Celtic cave painting. Cáel is the politician that funded the trip.
Rocco is a disheveled academic. Cáel only cares about how others perceive him. Good thing Rocco loves art, because Cáel appears to be a work of perfection.
When Cáel shows up to the cave for publicity for his campaign, Rocco is infuriated. But they have a connection neither can ignore.
If you love mm romance, fairies, and Celtic mythology, you'll love this book.