Ahh...Another sequel to this series.
In a way, I find the relationship between the two guys somewhat intriguing. It's like Soushi lets his friend fuck his girlfriend to keep her satisfied, while his friend lets him have sex with his girlfriend, and even helps position her better for Soushi.
That ending though...Something tells me that these two will join Soushi and Hime on the cruise, and then the usual swapping will happen again...