[Raven]

Gem has only got to have seen the "I'm not in here to make friends, it is a game and I'm going to play it" to have concerns that this supposed relationship is just part of aarons 'game' and that her sister is being used. Plus him blowing hot and cold, the maisy thing, the confusion and upset it has caused Faye.... More than enough for a sister to want to warn Faye to cool it and be careful.