Fourth wife (r18)

Norbert's eyes widened when he saw his sister's gaping ass. "Jesus Christ," he muttered, quickly averting his gaze as he felt his cheeks flush red.

"And as you can see, we are both very much enjoying this," Carol then said, her accent thickening as her orgasm started to build up.

"I can see that," Norbert muttered, still not looking in the direction of his sister and Mathew.

"Then why don't you join us?" Carol then suggested, spreading her legs a bit wider and tilting her hips back just enough to give Norbert a better angle.

Her brother was taken aback by the suggestion. He then quickly shook his head in response. "No, I couldn't possibly," he said, still not looking at the two of them.

It was clear that even if he consciously understood the consequences of what Carol just said, he was far from actually accepting it.

"And why not?" Carol asked, genuinely curious. "Don't you find me attractive?" she then added, spreading her legs wider as she tilted her hips back even further.