Dude, you really need to dive deep into the wiki. The best order of things is like this: Work on Aletta and Bree but don't date either one. Just get their submission as high as you can (Bree 50%, Aletta 70%) then get their lesbian % to 70 or 75, but don't go to 80 or more because you'll lose hearts with them every day until it drops back to 75 or less. Once you've done that, work on Shiori and Sasha, same thing. Don't date, just get sub to 100 and lesbian to 70. Don't talk to Sasha in the morning in the kitchen when she has Submission over 80 because it will trigger a sex event. Date Bree and do her side events to get her sub to 100, keep her lesbian over 50, get her hearts to 100. Date Sasha twice, then talk to her in the kitchen in the morning, then eat breakfast with her, raise her hearts to 100 and keep her lesbian above 50. Don't go to the livingroom when both girls are home until that's done. Then you can trigger the event in the living room safely. It's the same for pretty much every other harem if you want risk free results.