Your wife is incredibly left-wing. She's an active, liberal feminist and is even a member of like-minded organisations.

Your uncle, on the other hand, is a die-hard, alpha male right-winger. He is anything but a feminist and shares practically none of your wife's views.

The two of them often get into heated debates about things like feminism and immigration. She complains about him to you all the time, saying he's an asshole.

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Fast forward to a family wedding during the summer. Everyone was at the reception - dancing, getting drunk and having a good time. Even your wife and uncle, who you noticed were hanging out together, seemed to be in good spirits.

You weren't privy to their conversation, however.

"How does he put up with it?" your uncle asked.

"Pardon?" your wife said.

"My nephew," he explained. "How does he put up with your liberal bullshit. I thought he was smarter than that."

"Smarter than what? You?" she said with a laugh. "That's not hard. You only think with the brain between your legs. Maybe if more men thought like my husband does, we wouldn't be having this conversation."

Your uncle flashed her a cocky smile and leaned in to whisper in her ear. "Maybe if that brain between your husband's legs was as big as mine, you wouldn't need to keep begging me fuck you with it."
Mouth open in surprise, your wife turned and slapped him before storming off. With people staring, your uncle just shrugged, laughed, and said that she was drunk.

You lost track of them after that. It was a little while before you found them. They were outside in a secluded area. They didn't notice you so you kept out of sight. Your uncle was holding your wife in an unusual embrace. You thought that maybe she had hurt herself and he was trying to help her. That's when you noticed where his hand was - it was between her legs. Her panties were pushed to the side and he was playing with her pussy. 

"I hate you so much," you heard your wife say. "I can't think straight around you. You're like an animal and your stink turns me into an animal too. Mmm." She reached back and pawed at the front of his pants. All liberal logic and reasoning were cast aside in the face of baser instinct and passion. "I need that cock. I need you to mount me like an animal. My husband makes love to me but every women needs...craves to get fucked like a bitch in heat." 

Your uncle pulled his pants down. You could see that his cock was at least twice the size of yours. He positioned himself at your wife's pussy.
"Give it to me," she moaned. "Breed me, you fucking savage."
He eagerly obliged, shoving his thick cock into your wife's sopping wet pussy. You stood there, in shock, and could only watch as your stalwart feminist wife got fucked like a dog by your hung uncle. 

Your wife's higher brain functions had been turned off by your uncle's pheromones. He was doing things to her that you never would have even been able to think around her: holding her arms back so she couldn't move, choking her with his arm, manhandling her big tits, pulling her hair.
 

 Your own dick was rock hard as you watching them go at it. They changed positions a few times, with your wife surprising you once again when she dropped to her knees and blew his big cock. She flat out refused to give you blowjobs, saying that it was degrading to women - yet, here she was, slobbering all over your uncle's meat while he held her head and fucked her mouth. 

 All this time, you rationalized in your mind that it wasn't really your wife's doing - that somehow your uncle was forcing her into this. That was, until she pushed him down and sat on his cock. As she rode him, you came to the realization that your wife was a willing and active participant in this. 

He flipped her over onto her back and kept fucking her. Your wife's big tits were flopping up and down with each thrust. She moaned as she came. You were glad no one else was around to see this.
"Ooh fuck," she gasped. "Cum for me. Cum in me. Fucking breed me. I need it so bad!" 

Your uncle grunted and thrust his cock deep inside your wife's pussy. You knew that he was cumming inside of her - something else she would never let you do. 

You quietly slipped away, heading back inside while they finished up. They returned a short time later. Your wife made an immediate bee-line towards the bathroom.
When she emerged, she came to you.

"Where were you?" you asked, acting as if nothing had happened.

She rolled her eyes. "I was just outside having an...argument with your asshole uncle."

You nodded. "He can be such a huge dick sometimes."

A small smile crossed her lips. "Yes...yes, he sure can be."