there are no harem endings. there are bad endings and mild endings, and all of them are meh endings cause dev can never stick the landing. but the content is always fun so you get used to it.
there are really only 2 routes, bang sons ex-gf or bang sons current gf. either way you can get with sons drug dealer. best route is to not play all shake your head at how even though the dad is a grade a asshole of a father, no one would blame the dad for choking his son to death. the apple fell and rolled right back up the tree
oh, and bitch ass bitch