But how is that logical? Jin is someone else's slave. She's not going to just drop by because Lin has a sex question. Especially because the fact that I haven't purchased her means that she's going to disappear again once they have the conversation, and Lin apparently won't care? Also, Lin and Jin very clearly have an ongoing relationship in the scene in which she appears. There's not a bit of surprise that the other is there. That casual banter only makes sense if Jin has been around.
Then why is she there? She doesn't even know Lin's alive, if she hasn't been purchased by the MC. The "visit" involves no surprise, shock, or emotion at the presence of either sister. She just shows up and they have a conversation as if they've been having them all along. It's grossly illogical, and clearly either a programming error or a characterization error.
Of course not, because I haven't purchased her from her previous owner. She'd have no reason to be in the hotel, or to know where it was, or to know that her sister was living there, because in that version of the story Jin is unaware that Lin is alive.
No, that's wrong. Jin's been available for ages. I just hadn't pulled the trigger.