Apps won't open for it till January, but if by then you're still looking, you could check out Tanagura. It's a plot-driven dystopian sex game set in a futuristic pair of cities on another planet, it's a healthy medium pace that can tip toward slow or fast depending on time of month, it's backtag friendly, and there's a Kaiba, Yami Yugi, and Uta there right now, should castmates help boost your interest. The game's navigation page can be found here.