Don't quit your day job, I wouldn't want you as a defense attorney
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Realistically speaking, no jerking: Bianca would be a bad person, yeah. Bad person, bad friend, and a big stinky hypocrite. DPC making her bait for a bad ending with Jill would not surprise me in the slightest, and neither would making Bianca available as an Other once things settle down after leaving Matthew (which could still happen without MC spilling the beans).
All that being said, I still want to fuck her

I'll betray Jill just the one time, feel super shitty about it, and then replay the Bianca lewd completely guilt-free