I got you homie you need to get the home harem first. Next when you see Ryan cheating at the club go to sam and talk about Ryan. The game will ask you if you want to tell Sam about Ryan. DO NOT tell Sam. Wait until her wedding day. During the scene after the wedding is over you will have 3 choices. Go to the bathroom, dance with Sam, or go for a walk. Choose go for a walk. Sam will find out that Ryan cheated and you will go on her revenge route. Soon after you need to play Emma route. Do not make Sam your gf before this. Sam will ask at some point if you are dating her or if your just friends with benefits. Choose friends with benefits option. Max her out then you will activate her home harem route. Once it starts it's easy to finish the rest. The game practically hands the ending to you just look at the home harem Samantha tips in game.