His sister flirts with him?

Anonymous
my boyfriend's sister has been staying with us, and she flirts with him. it's disgusting. she gets jealous when he pays attention to me and not her, so she makes up stories about him. she is also always talking about his male parts, and follows him everywhere. and he won't say anything to her about it. am I the only one who thinks thinks this is weird?
His sister flirts with him?
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