Sky is possessed.
This idea comes from the bfswifeforever TikTok account, where Sky has been shown to have once been a dark-skinned blond before possibly making a Deal with the Devil. Sky was accidentally given Sunday’s vocals for Sky and Manifest and had her own vocals in Wife-Forever, so her being possessed would give an In-Universe explanation for her vocal change. It also explains her powers, as she was just an ordinary human only to get manifest Powers via Possession.http://tvtropes.org/pmwiki/pmwiki.php/WMG/VSSky
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