The next day, Peter left for a photoshoot event that would keep him away for the entire day, he wouldn't be arriving back until 2am at least. 
MJ met Kraven at work. "Today, you're all mine," he said to her. "But not here. I called the Daily Bugle to follow up with your husband and was informed that he would be occupied with work until early in the morning. Today, I'm taking you home and ******* you on the marital bed you share with your husband."
Chills ran down MJ's spine. This was something she had never done before, and it thrilled and terrified her. She was reluctant, because she felt it was too much of a betrayal of Peter. But the thrill of Peter's enemy ******* her on the same marital bed she shared with him was so erotic that she just couldn't say no. 
"Before you go, drink this," Kraven said to her. He gave her some sort of cocktail. MJ didn't know what was in it, but she agreed. She couldn't help but see that when she finished drinking it that Kraven had a devilish smile on his face.
MJ was sent home and Kraven arrived an hour later. MJ opened the door dressed in red lingerie.
"Do you like it? It's Peter's favorite lingerie on me. He bought it special for our anniversary. No one else has seen me in it besides him - or ****** me on our marital bed0, either."
It wasn't a choice she had made lightly. She never really wanted to be so cruel to Peter before and betray him, giving their personal intimacies to another man. But the fact that Kraven was Peter's enemy - a man he had been in brutal fights with, a man that he hated - turned her on so much itself that she couldn't help it.
"Well then," Kraven said as he stepped forward and grabbed her ass, "looks like I'm replacing that wimpy cuckold in each and every way this evening." Normally she defended Peter when people insulted or degraded him, but the way that Kraven did it was so manly that it made her wet. He was truly the alpha male, defeating and humiliating Peter in every way and then claiming his wife as his own.
A short while later, Kraven was ******* Mary Jane hard from behind on the Parker marital bed.
"Oh, yeah, that's it! **** me good, tiger!" MJ yelled out.
"You like being ****** on your marital bed, you slut?"
"Oh **** yes, I love it!"
"Ever had it this good before on this bed!"
"Oh, god, never!"
“And why’s that? Hubby can’t satisfy you?”
The idea of this enemy of Peter’s trying to insult and humiliate him as he ****** his wife in their own marital bed turned MJ on even more.
“No, he can’t **** me like you can.”
“And why is that?”
MJ hesitated, but the act of insulting Peter for some reason was really turning her on. Against her better judgment she decided to continue the issue.
“Because he has a tiny dick.”
Kraven laughed as he continued to **** her as she continued.
“You’re so much bigger than my husband. He’s got nothing on you. You **** me better than my husband ever could.”
“Kind of a wimp, huh?
“Oh, yes, God, he’s a wimp.”
Kraven continued to **** Mrs. Mary Jane Parker further, enjoying the fact that he was getting her to betray and humiliate her husband. Still, it wasn't enough. He knew that she had a secret...one he intended to exploit.
As he grabbed her ass and continued to **** her from behind, Kraven brought up the one subject he was sure was going to get her to betray her husband the most.
"Tell me...Mrs. Parker...your husband always takes pictures of Spider-Man. He seems to be his most trusted confidant. Is there any chance your husband knows Spider-Man's real identity?"
While Kraven was ******* her from behind, MJ had to take a moment and stop. She detached herself from him and paused.
"Wait...what?"
"Your husband seems to be friends with Spider-Man...which would explain why that wimp still has a job. Perhaps there is a chance that Spider-Man revealed his true identity to your husband...and maybe you know as well?"
Mary Jane shuttered on the bed she shared with her husband and this superior male talked to her. He was trying to talk her into revealing the ultimate secret her husband had shared with her...the ultimate betrayal. Still, she had to remain strong.
"What? No...no...he doesn't know..."
Kraven smiled, knowing she was lying. "Fine then. I will go ahead and leave." He started to walk out.
Mary Jane yelled in protest "What? No, don't leave!"
"So you'll tell me the truth, then? Otherwise, I'll stop ******* you..."
Mary Jane hesitated for several moments. She didn't want to betray Peter's secret, but at the same time, Kraven's **** was just too big and she felt completely owned by him. And besides, the idea of betraying Peter's ultimate secret was such a turn on for her for some reason.
"No, don't stop! Okay...fine...yes, he knows, and so do I. But I won't tell you any more than that."
Kraven smiled, knowing he had her beat and it was just a matter of time at this point.
"Is that so?" He took his **** and started to slide it up and down Mary Jane's *****, teasing it.
"So, you know Spider-Man's identity?"
MJ moaned in agony. "Yes, I know it. You bastard. But don't expect me to reveal it. I would never betray my husband's trust like that."
Kraven continued to move his **** up and down her *****. "But wouldn't it be so erotic to reveal your husband's ultimate secret to me, Mary Jane?"
MJ couldn't argue with his logic. Her ***** was positively gushing at the potential ultimate cuckold betrayal. But at the moment she just couldn't do it. The idea of completely betraying her husband, to reveal that he was Spider-Man to one of his most deadly enemies, made her positively wet. 
Kraven started to slowly insert his **** into MJ's ***** yet again. "You want to tell me, I can tell. The thought of betraying his secret to me, the superior male, turns you on." He began to thrust back and forth.
MJ moaned as he continued to enter her. "Oh god...no...I can't..."
"Fine, then," Kraven said, smugly. He removed his **** from her *****. "I'll be on my way then."
MJ was completely horny and felt unfulfilled. "Wait, what! No! I....don't leave! I'm still so horny!"
Kraven smiled at her. "I'll only **** you again if you tell me Spider-Man's true identity."
He moved in on her again and started to rub his **** against her clit, stimulating her, but not moving in. "Your choice, Mrs. Parker."
Kraven's **** was driving her wild. But still, he was asking her to commit the ultimate betrayal of her husband's trust. How could she do it? She writhed her head back and forth while in heat.
"I....I can't..."
"Yes. Yes you will," Kraven said with a smug self-confidence.
"No....I'm sorry...I...."
"Fine then. Goodbye, Mrs. Parker."
Kraven removed himself from her and started to leave. MJ was absolutely in agony, and her horniness took the better of her other senses.
"No, wait!"
"Yes?"
MJ suddenly felt a huge rush of eroticism as her body started to betray her. She knew that she was about to commit the ultimate betrayal of her husband. But, damnit, she needed Kraven's big **** to **** her. And truth be told, the betrayal turned her on.
"Spider-Man is....is..."
"Yes..."
MJ looked upwards at Kraven's muscular frame then continued her sentence. "Peter is Spider-Man."
It was done. The ultimate cuckold betrayal. She had given up her husband's secret identity to one of his villains, so that she could have more of his ****.
Kraven started to laugh. "So are you telling me that not only have I been ******* my enemy's wife, but I got her to betray his secret identity to me because of the fact that I'm such a superior male?"
MJ started to freak out, but she couldn't deny the fact that she was turned on by the betrayal.
"Yes...Peter is Spider-Man. You've been ******* your enemy's wife the entire time." Her juices were flowing at this point and she started writhing.
At this point Kraven pounced on her again and inserted his **** into her ***** yet again, causing her to moan.
"Tell me again that I'm better than him," he growled.
As Kraven continued to **** her, she moaned "Oh, God, yes, you're SO much better than him. Your **** is so much bigger."
MJ wrapped her legs around her husband's enemy's back as he continued to **** her. She reveled in the fact that she had just utterly betrayed her husband because of the fact that his enemy had a much bigger ****, as wrong as she knew it was. 
"Beg me to **** you.

"Oh yes, **** me. **** me like my husband can't. Cum inside Spider-Man's wife."
"Before I cum, I have something to tell you. You know that cocktail I gave you earlier?"
"Yes?"
"It is a powerful jungle fertility potion. It will destroy the preventative effects of any morning after pill....it effectively is the equivalent of taking strong fertility drugs for weeks."
MJ paused in hesitation. "So you mean..."

"Yes. You are extremely fertile right now, Mrs. Parker. The next sperm inside of you will be guaranteed to find your eggs. Would you like Mr. Parker to do the honors? Or would you rather let a superior male...his enemy...beat him to the punch and knock up his wife for him?"
A shiver ran down MJ's spine. She hadn't been anticipating this. She had always been so careful...
Could she really do this to Peter? Could she really let his enemy breed her...knock her up?
She wrapped her legs around Kraven, lost in the thrill of the betrayal and humiliation. "Cum inside of me."''
“I thought you would say that, my slut” Kraven grinned. “Tell me again how much better I am than your husband.”
MJ was totally lost in the moment. “Yes…please…cum inside my *****. You’re a real man and my husband is just a loser.”