I hired her to be a naughty stepsister - Oral and vaginal sex with my stepbrother

I hired her to be a naughty stepsister, and she's been doing her job well. She's been sneaking around with my stepbrother, and I'm not too happy about it. But I can't deny that she's got a body that's worth the trouble. She's got a big, juicy ass that he can't resist. He's been giving it to her every chance he gets, and I don't mind too much. It's just that he's been taking things a bit too far. He's been fingering her ass, ripping her clothes off, and even putting a buttplug in her. It's not exactly what I had in mind when I hired her, but I can't deny that it's been turning my stepbrother on. He's been fucking her hard, making her scream and beg for more. And when he finally cums, he fills her up with his sticky load. It's not exactly what I had in mind, but I can't help but be turned on by the sight of her getting fucked.