If you take advantage of her, she'll start blowing you through the glory hole before inviting you in to have sex. When she takes her clothes off, you realize she has a dick. You can either fuck her in the ass or stop things there. After you're done, she runs off saying that she'll see you again sometime without giving you her name.
If you help her out and open the door, she hurries off and promises she'll repay you somehow in the future.