She encourages it

Jessie bent down and kissed her husband on the cheek, and whispered, "Don't say anything, just agree with me, and be honest."

She stood back up and smiled at the doctor. The doctor was practically trembling with fear. "So, how far did the two of you get?"

The doctor stammered that she didn't know what Mrs. Goodman was talking about, and Jessie pulled her husband's pants back down, whipping out his half hard cock. She spat in her hand and began rubbing it back to a full erection.

"Please don't lie to me," she said calmly, "I detest liars."

"H-he... he said he was single! I didn't know about you!" she squeaked.

"I see. And how far did you get? Judging by your clothes, you hadn't done much. A blowjob?"

"Just my hands." she admitted, blushing.

"Well, I suppose Nick should have told you the whole truth. You see, me and him have an open relationship." She saw the look of confusion on the other woman's face. "We have sex outside of marriage."

"But that's cheating!"

Nick decided he should interject. "Not really. We're both fine with it." Jessie sped up her hand on his cock slightly, as a reward, and he continued. "It's less cheating, and more playing by different rules."

There was silence for a few seconds, and then Jessie released his cock, and stepped back. "I think that I've done enough. I want you to make him cum."