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You have to imagine running into her while she was masturbating, and convincing her to let you help her out, after being degraded and possibly physically assaulted by her. Maybe slap yourself on the face a few times if you're into it.
When you ultimately woo her into having sex, you absolutely must tell her "please Louise-sama let me cum inside you" before climaxing. While you imagine fucking her you have to absolutely squeeze your dick as hard as you can to emulate the feeling of her extremely tight pussy.