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Message: <blockquote data-quote="Toritoribe" data-source="post: 778735" data-attributes="member: 37151">～てやってください is used only when the recipient of the favor is one of the speaker's in-group members. That's why I used 妹 as an example, and why this expression acts as a humble expression. In fact, 妹を助けてあげてください is hardly used for "my sister", or rather, "your sister" would be more common interpretation in this case (it should be 妹さん due to the politeness tone of the sentence, though). I believe （私をどうか）助けてやってください works fine, too. It could sound "servile/obsequious", though.The person with glasses is actually a man. He is inviting Toni to go to 風俗 together, as you interpreted initially. She is asking the acquaintances/friends not to invite him, rather than readers in general.</blockquote>