Well, if they wanna get really kinky with Lei they could create the possibility to go some sort of love triangle route with Alice, Lei and Lei's father! Not full incest, that wouldn't really fit the game, but maybe Alice makes sure Lei sees her fuck her dad and gives her some weird feelings (thinking about daddy's cock) or start an affair with Lei (wishful thinking on my part, I admit) and have her dad walk in on them having sex. Both are very unlikely though, considering the existing five chapters.