Dark Horse by A.E. Lister

Adam Marsland has a plan.

He’s been managing the Braided Crop Ranch for six years and wants to bring everybody he can find back for a week of games, competition, and celebration.

Henry Swift was a ponyboy at the BCR during its very first year. He learned to trot, pull a cart, and submit to his trainer. He’s never quite left the experience behind and is excited to receive Adam’s invitation to return.
But it’s not only the Ranch and its sex-positive atmosphere pulling Henry back to the seclusion of the Muskoka wilderness.

Ever since their first frantic and lustful encounter in the woods, Henry’s had a thing for Adam Marsland and his memories of his tumultuous time on the ranch have haunted him for years. Adam’s still at the ranch, and now Henry can go back and discover if the older man has any regret for the way things turned out in the past.

But the gymkhana Adam’s planning means the return of a plethora of ponyboys and trainers and Henry wonders if he will have trouble reminding Adam how much they wanted to be together back then, and how possible it might be for them now, in the midst of the excitement and testosterone.

No one ever said love was easy, but Henry is determined to make the most of his chance.