Fucked bare by the fitness trainer

I had hired a private fitness trainer to teach me a pair of new exercises. As I squatted on all fours in front of him, I noticed that he was working my butt a lot. I turned round and he was standing there with his trousers open and his cock hard. Well, I had imagined the training a little differently, but I have nothing against a hot fuck. Blown, licked and fucked bareback. A nice workout too ?