any incest-based games with a plot that is not "oh you have a boner let me take care of it even though were familly"? My favorite one was "Boku Mama x Tomo Mama Koukan Hameppu Life ~Bosei Afureru Bokura no Kyonyuu Mama-tachi wa Haitoku ni Mimodae Nagara Amaenbou o Musabori Aegu~" where it first starts with ntr then develops into exhibitionism to then give you the choice of which route you want and so on and so forth.