I like Sub100% and I like to complete all the events as much as possible, so my choice is to find out that Ryan cheated and choose to make Sam happy without telling him, dance at the wedding-Path B
When Sam finds Ryan cheating and comes to have sex with you, tell her you know about Ryan cheating and accuse Sam of not being better-Path D---E---A
When Sam asks to know the truth, choose i admit-Sub100%+Harem
There are three places to pay attention to, one is to complete Emma's Friend route before she divorces, otherwise you will be introduced as a boyfriend by Sam.
The second is, before Wait for Emma to Reappear, whether Sam walks to Path A will affect the subsequent options.
The third one is that I can't confirm which task must be achieved at present, that is, when Sam's Les point reaches 45%, it seems that through the event, Emma can also lock Les point 50%.
Sam's task is actually not difficult to understand. You can think backwards from my options, and you can understand the instructions on the Wiki.