How do I have sex with Sada? I'm at the point where the only hint says "have sex with Hitamu, Yasuko and Sada." I've done the other 2 but can't figure out Sada.
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Hopefully you figured this out ages ago, but I got back on track by setting up the Momoko/Airi threesome, once by asking both to sleepover on same night, once by peeking on Momoko in her room (afternoon?), and staying when spotted.
That unlocked some Sada content (wash her towel), still waiting to see how far that gets me.