Increasing the pitch of her nyahing screams as you increase your own pace with the butt humping. Really arching her back lewdly from how hard you are giving it to her, feeling her asshole shred and loosen with each new hump into her. Gagging out her moans and trying her hardest to get you to cum into her butt and give Nina's sexual energy to her instead! Ears tufted back still as she notices that you are playing with her pussy, but it isn't anything compared to her butt torment, as Nina keeps watching and has her first orgasm from masturbating. Watching her sister getting destroyed and loving it, arching her own back and lewdly panting out her own orgasm. Giggling at Lisa and at how much discomfort she is in,<strong>"Clearly you should just give up Lisa. You are not lewd enough to take my sexual energy from this perverted puppy! Nyah!"</strong>