Dev said both mom & sis will have same pace of sexual progress. But, somehow, like all other incest games, he made sis's route as more faster sexual progress compare to mom's route. Yeah, both blow job with sis & pussy rub with mom scenes are nice. But, one have to agree that bj is can be called as "more hardcore" than pussy rub because it involves mouths and cocks. Where as pussy rub scene is just rubbing but with a cock.
I wish that in next update, Mom will do bj and sis will have less "hardcore" action.