Getting Emma in a "by the guts" playthrough is impossible. If you want Emma, you need to adjust your playing style and take it slow with the other girls. Which decidedly means avoiding Cassidy.
Which is dumb. Most people, if they are just playing the game and have gotten her later than some, won't ever be able to play her if they aren't using a walk through. They might have a girlfriend, or a sex slave, by then and you cannot change that title of sex slave. Even if you friendzone someone. She's not a bad character, one of my favorites, but you would easily have sex with Bree before her and not even have the knowledge she can be bi by that point. Some choices in this game mechanic wise are questionable. I've never made a game so I know it can be hard, but like come on. But here I go, starting over again so I can have every girl.
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Let me think about it, when I met Emma, I already made Shiori, Morgan, girlfriend + slave + pregnancy. At least these two people are objects that Emma cannot tolerate. Others include Sasha, Bree (tolerable objects), but I still caught up with Emma, so maybe it's because Audrey is my girlfriend+slave+pregnant, so I finally got a total of 3 love points.
Except for Alexis, I wanted to take the NTR route before, and I stayed until the end, and they all appeared later than Emma (such as Cassidy). In addition, the members of the band harem, because I want to control the LP, I didn't put Emma in the related events first. So overall, Emma is actually very easy to get along with.
Of course, I used cheating + time setting, but the point I have said several times:
1. Don't cheat Emma, Admit that you have a girlfriend. you have to go another route if you want to cheat her.
2, Answer like kissing when watching a movie. (+1 love index)
3. As long as you have sex with Bree, you must let her Les Point reach 45. (+1 love index)
In the Girlfriend situation, there is an item that can easily get the index:
If Palla, Audrey or Lexi are his girlfriends (and he admitted it before) then Emma will gain +1 Lovepoint and +20% Dating Point.
With these 3 points of love index, when I am in The Judgment, I will stand firm and win.
The last thing is to avoid dating other girls while dating Emma, and make them a situation that Emma cannot tolerate.