I'll try to record me getting the ending tommorrow. I believe I forgot to mention some dialogue options with Lily raise suspicion, but I forget if true and which.
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Looks like I'll need to redig up what triggers suspicion on Lily as I can't truly recall what I did to get it after discovering how. I'll do it on Monday when I got more time. Regardless you can play around with things, but ultimately I do know picking up items does trigger suspicion, I forget if the keys do.