Aka, time for some real penetration

"What are you doing?" Rebecca asked, watching in confusion as George removed his shirt to reveal his soft, pale torso with its pronounced belly.

"The final phase of assessment requires full physical response testing," George explained, now unbuckling his belt. "It's our most accurate measurement tool for infidelity probability."

Rebecca's eyes widened as she realized what he was suggesting. "You mean... sex? No, that's—that's actual cheating!"

"Not in a controlled assessment environment," George countered smoothly. "This is a medically supervised procedure designed specifically to measure your vulnerability. In fact, refusing at this stage would invalidate all previous measurements and classify you as 'high-risk, assessment-resistant'—our most concerning category."

"But this can't be standard procedure," Rebecca protested, watching with growing alarm as George unzipped his pants.

"I assure you, it is for cases that display your level of response," George insisted. "Approximately 18% of women we screen require this level of assessment. Would you prefer to be categorized as high-risk without completing the protocol?"

Rebecca hesitated, her mind working through the manipulated logic. George could almost see the thought process: if she refused now, she'd be labeled as likely to cheat without having the chance to prove otherwise. But if she went through with it, perhaps she could demonstrate that she wasn't actually **** to infidelity.

"This stays completely confidential?" she asked finally, her voice small.

"Absolutely," George assured her, pulling down his pants to reveal his straining erection beneath stained boxer shorts. "All assessment data is protected under strict confidentiality protocols."

Rebecca stared at the tent in his underwear, swallowing hard. "And... this will prove I'm not likely to cheat?"

"If you demonstrate appropriate resistance during the procedure, yes," George confirmed, now removing his boxers to reveal his thick, veiny cock. It wasn't particularly long, but it was girthy, with a pronounced purple head already leaking pre-cum.

Rebecca's eyes widened at the sight. George wasn't conventionally attractive—his body soft and pale, with tufts of ungroomed hair—but his cock stood proudly erect, ready for the "assessment."

"I need you to lie back and spread your legs wider," George instructed, positioning himself between her thighs. "Remember, this is a scientific measurement. Your responses will be cataloged for risk assessment."

Rebecca reluctantly reclined, her legs parting to accommodate George's bulk between them. The paper gown was now bunched around her waist, leaving her completely exposed from breasts to thighs.

"I'm going to begin penetration testing now," George announced, taking his cock in hand and guiding it to her entrance. Despite her apprehension, Rebecca's earlier orgasm had left her wet enough to accommodate him. "Remember to report your sensations honestly."

The blunt head of his cock pressed against her opening, and Rebecca gasped as he began to push inside. Her pussy stretched around his girth, her inner walls gripping him tightly as he slowly buried himself to the hilt.

"Oh god," Rebecca breathed, her hands fisting in the paper covering of the examination table.

"Initial penetration response: highly receptive," George noted, holding himself still within her for a moment. "How do you feel having another man's cock inside you, Rebecca?"

"Strange," she admitted, her inner muscles unconsciously squeezing him. "Wrong, but..."

"But?" George prompted, beginning to withdraw slightly before pushing back in.

"But not... terrible," she confessed, her face flushing with shame.

"Honesty is essential for accurate assessment," George encouraged, establishing a slow, deliberate rhythm. "Your body is accepting non-spouse penetration with minimal resistance. This is a significant risk factor."

He began to thrust more purposefully, his soft belly slapping against her with each forward motion. Rebecca's breathing quickened, her initial discomfort giving way to **** pleasure as George's thick cock stimulated nerve endings that had perhaps been neglected in her marriage.

"Oh!" she gasped as he changed angles slightly, hitting a particularly sensitive spot. Her legs instinctively wrapped around his waist, pulling him deeper.

"Leg engagement noted," George observed, increasing his pace. "Active participation in non-spouse intercourse. Critical risk indicator."

Rebecca's face showed her internal conflict—shame at her body's betrayal warring with the undeniable pleasure she was experiencing. Her breasts bounced with each thrust, nipples hard and pointing upward.

"I'm not... I wouldn't..." she tried to protest, but her words dissolved into a moan as George reached between them to rub her clit.

"Your verbal denials contradict your physical responses," George pointed out, his cock driving into her with increasing ****. "This cognitive dissonance is exactly what leads to infidelity situations."

His thrusts became more vigorous, the wet sounds of their coupling filling the van's interior. Rebecca had given up any pretense of resistance now, her hips rising to meet his thrusts, her head thrown back in pleasure.

"I need to test your position adaptability," George announced, suddenly withdrawing. "Turn over onto your hands and knees."

In her aroused state, Rebecca complied without question, flipping over and presenting her ass to him. The paper gown had been completely dislodged now, leaving her naked except for where it bunched around her shoulders.

"Doggy-style position compliance: immediate," George noted, grasping her hips and positioning his cock at her entrance again. "High adaptability to non-standard positions with non-spouse indicates significant vulnerability."

He thrust forward hard, burying himself to the hilt in one smooth motion. Rebecca cried out, her back arching as she pushed back against him.

"Oh FUCK!" she exclaimed, surprising herself with the profanity.

"Verbal disinhibition noted," George observed, establishing a punishing rhythm as he pounded into her from behind. "Loss of verbal control during non-spouse intercourse."

His hands gripped her ass cheeks, spreading them apart to give himself a better view of his cock disappearing into her glistening pussy. The sight was intoxicating—this respectable married woman on all fours in his van, taking his cock like she was made for it.

"I'm conducting sperm reactivity testing now," George announced, his breathing becoming labored as he approached his climax. "This measures your body's response to non-spouse ejaculation."

"Wait, you can't—" Rebecca began, suddenly alarmed.

"It's a critical measurement," George insisted, his pace becoming erratic. "Sperm reactivity is our most conclusive indicator."

Before Rebecca could protest further, George hilted himself fully and groaned, his cock pulsing as he began emptying his load deep inside her. The sensation of his hot cum flooding her passage triggered Rebecca's own orgasm, her pussy clenching rhythmically around his spurting cock as she cried out in **** ecstasy.

"Simultaneous orgasm with non-spouse ejaculation," George gasped, continuing to pump his hips gently, ensuring every drop of his seed was deposited inside her. "Highest possible risk classification."

Rebecca collapsed forward onto her elbows, her body trembling with the aftershocks of her intense climax. George remained inside her for a moment longer, savoring the feeling of her pussy still occasionally gripping his softening cock.

When he finally withdrew, a trickle of his cum followed, dripping from her well-used opening onto the examination table. The sight filled him with primal satisfaction.