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I have done it after 10 PM and just keep trying to knock on their doors until it triggers.
I'm also trying to figure out how to do Home Harem+Minami, I've checked the wiki and followed it and it's still not happening.
I've had sex with Minami multiple times already. The only time I ever "denied" Minami is when she asks me out on the generic date "Hey, do you want to go out with me [DAY] evening?"
I wait till 8 PM for Bree, Sasha, Minami to be in the kitchen. I initiate the threesome with Bree+Sasha.
After the scene ends I'm back in the kitchen at like 11PM or something.
I go to my room, set the alarm for 9 AM, wait till it's 3 AM then I hit sleep.
Sleep for 6 hours, wake up at 9 AM and nothing happens.