Wow so this means the janitor chapter is a continuation of the principal chapter, therefore it's a directly continuation of the original main sinful lust story, it's like a clouser
Lizana probably saw the principal with another parent representative during the event, and, surprised and disappointed, she left, and the janitor comforted her .
Or maybe Lizana, to get revenge, slept with the janitor
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That could be a possibility, but I sincerely hope it's not.
I'd rather Lizana be vulnerable and have the janitor "help her and cheer her up."