The kiss on the forehead was on the nose. I would be really surprised if Chad's secret doesn't involve him being gay.
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You know, after replaying the game i started to find really weird how Jill completely switch her interest on the protagonist from a person concerned with the bullying situation to someone who wants a sexual and/or romantic affair. And that happens as soon as Bella gives the okay sign despite the fact the Jill said before she never had any interest other than being friendly with the protagonist.
Quinn and Sage may look like the obvious suspects but right now Jill looks weirder to me.