When James got back, Amy could immediately tell by his huge grin that he had spent the last few hours at Joanna's, fucking her. She walked up to him and gave his cock a squeeze through his jeans, whispering "do you even have energy left over to take care off me?". To which James replied "I'll always have the energy to fuck you Amy".
They would have to be patient first though, because they had to have dinner with everyone. After dinner they returned to the hut seperately, knowing that they had to protect their little secret, becasue they were posing as brother and sister. They knew that Cathy, the owner of the hut wouldn't be back for a few hours, so they would get plenty of uninterrupted action. When James stepped into the hut, Amy was already waiting for him naked, her legs spread wide, giving James a clear view of her dripping pussy, one of her hands rubbing her clit, the other one attending to her nipples.
Knowing that this pussy belonged to him and that Amy was wet in anticipation for his cock, made it become hard as rock immediately, tenting his jeans before he could take them off. He tried to strip as fast as possible, and skipping all the foreplay, positioned himself right at Amy's entrance, before pushing in and starting to relentlessly fuck her.
Amy's pussy was not the toghtest he had ever fucked, but she was by far the most skillful girl he had fucked, massaging his cock with her pussy in remarkable ways, making this the best fuck he had ever had. Sadly, because they had to keep their fucking a secret, Amy couldn't moan as loudly as she would at Cherub, which didn't make James feel like he was satisfying her completely, even though he knew why she wasn't moaning.
This did bring the benefit of giving him more stamina, so he only came three times before Cathy was due to return, shooting his massive load deep into Amy's womb each time, knowing she wouldn't get pregnant, before getting his young cock hard again in a matter of seconds. Amy came so often that even math genius James lost count, spraying him and the rest of the cabin with her juices so often that the floor was completely wet around them. As she got up off James's cock, her legs trembling in pleasure, she bent over and gave James one last kiss, his only consolation being that he knew they would fuck again very soon.