anyone know if there's a trick for getting 3 ways to trigger? I somehow got one once and since then haven't been able to get it even talking to the same characters
Don't know about MFF but I finally got MMF to trigger with a class/cast of 3. Right after the MMF scene the current (relevant) stats are:
Girl:
Boy 1 says Good Partner
Boy 2 says My Beloved
Boy 1:
Girl says Good Partner
Boy 2 says Good Partner
Boy 2
Girl says My Beloved
Boy says My Beloved
Girl + Boy 1 : Erotic compatibility - Perfection
Girl + Boy 2 : Erotic compatibility - The Best
Boy 1 + Boy 2: Erotic compatibility - perfection
To get to this point, I started off with 1 girl and 4 other guys. The girl had the personality of Obedient/Carniverous while having low virtue and low sociability (I think the latter worked against me) while the other guys had Carniverous/Wild and were bisexual with low virtue and high sociability. I started off the days and randomly chatted with each till I found a pair of guys who were in a relationship and got the girl in a relationship with at least one of them. I then omitted the other two guys since I didn't want to get burned by any cheating.
After that, I rotated between each character as my player character, and did:
Sex (and make sure to bring someone or both to climax to build H compatibility or you'll regress)
Naughty Topics
Romantic Topics
I think the Romantic topics are more important than Naughty as they increase Love experience points, but I'm not positive if Naughty also increases love points as well. I tried other stuff like announcing to everyone to take good care of X person, or calling for everyone to have sex. I think the above should be sufficient. But do keep track on who you need to build a relationship. Admittedly, with Boy 2, I would initiate sex but skip the scene immediately, and it ended up getting the girl to lose interest even though she was in a relationship with him.
Once you get high enough stats, you can interrupt the couple who's having sex and join them.
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Tossing the above link as reference and shout outs to /aa2g/ and the Koikatsu discord for bouncing ideas off with me.