You wave him over, just asking him to join the fun. He tries to hide his delight, but you know he's excited. As soon as he's close enough, you grope at his left pant leg, just strong enough to reveal a beautifully large, tan cock, obviously hard and still spilling cum. He tries to fuck your partner, but the guy's ass is hidden by the seat. Luckily, or maybe not, the wagon jolts and you all come tumbling to the floor. Taking this opportunity, the surfer dude quickly injects his dick into the farmer guy's hole. Not happy with the fact that you don't get to fuck someone, you guide your dick into original partner's ass, and now you and surfer dude are fucking him. Your loads mix together, and you're both gasping and exhausted, while the other is just relaxing, somehow unfazed by it all. By the looks of it, he's probably done this tons of times. Asking him would be rude, though, so it's better not. Surfer dude and you just collapse, but you want to keep going. Time for round two. Slowly wiggling your penis out, you sharply shove it into surfer dude. In spite of yourself, you play with him, trying to get him over again. Clumsily, because you can't see his front, you finger his tits with one hand, ever so slowly moving the other down his body, cupping your hands around his balls. You play with those, then suddenly realize your original partner's left out.