Karen grunted as Tim's large cock pressed against her anus. She was on all fours on the bed, and he was behind her, pouring lube on her asshole and his cock. She couldn't believe she was doing this. It seemed like she had finally trained Tim not to ask for anal sex, and here she was begging for it.
"Oh yeah baby," she panted, "fuck me in the ass with that big cock of yours. Unnnh. Oh it's so... unnh... so big. Fuck me harder baby. AHHH."
Karen let out a squeak as Tim's cock head entered her rectum, stretching it painfully.
"Are you okay," Tim asked
"Unnh... yeah.... don't stop baby... fuck my ass hard," Karen panted out between breaths.
Karen's asshole burned as Tim's cock pumped in and out of her butt. She had never really enjoyed anal sex. She kind of liked it when Tim slipped a finger in there while fucking her, but a full cock was really too much to be comfortable. The good news was that she had never came from it, even if Tim diddled her clit while doing it. It was Sunday night, and she had not cum since Thursday night when she had been out with Nikki. She had been mortified Friday morning about all she had done that night at the bar, and felt unbearably humiliated. But that humiliation had also made her incredibly horny, and as the day went by she became more and more obsessed with cumming again. Nikki had called Karen Friday afternoon to remind her not to cum until she had filled the bottle again. The college girl had also sent Karen an email with the transcript of one her earliest chats with Duke, letting her know that it was permanently deleted. Karen wasn't sure she could trust Nikki, but she wasn't sure what choice she had.
Truth be told, it probably didn't matter. In spite of the fact that Nikki now had dozens of photos of Karen lying naked with her legs spread and cum leaking from her pussy, Karen wasn't really focused on the blackmail. The reality was that she could not stop thinking about how she wanted another orgasm. And not just any kind of orgasm, but one like the one she had had on Thursday night. One that came after being debased and being forced into giving blowjobs to countless men. After being tormented by the two younger women. An orgasm that came from pounding her pussy with a bottle full of sperm that she had collected from all those blowjobs. She knew that the only way to do that again was to follow Nikki's instructions, especially about not letting herself cum.
This left her with the challenge of how to satisfy Tim, and how to keep him from getting suspicious. Even though her jaw was sore, she had given him a couple blowjobs on Friday, and then three on Saturday. But today he had made clear that he wanted to fuck, and had not let her blow him. In desperation, she had decided to let him fuck her ass. Unfortunately, he knew she didn't like it, so he had declined, and started playing with her pussy. Karen had found herself forced to beg her husband to fuck her ass, in order to keep from cumming. Finally, he believed she meant it, and so now she found herself grunting and squealing underneath him. He reached under her and began squeezing her breasts and pinching her nipples. They were still sore from the abuse Celia had given them, and Karen let out a small cry. Tim increased the pressure, thinking that it was a cry of pleasure.
To Karen's amazement, she found herself edging closer to orgasm. She couldn't believe it, she never came during anal sex, but somehow thinking about how she was being made to do it, that it was really Nikki that was making her, it was making her more horny. She began to clench her ass, and work her hips to increase the stimulation on Tim. She had to make him cum soon, or she would have an orgasm, and all would be lost. She kept talking dirty to him.
"Oh yeah...unnh... fuck me harder... ohhhhh.... fuck my ass with that big cock of yours... AAAH... I want to feel you cum in my ass."
Karen kept talking dirtier and dirtier, and squeezed her ass on his cock hard, even though it made the fucking more uncomfortable for her. Thank God, she could feel him tensing up. Tim let out a loud moan, and she felt his cock pulse in her ass, releasing stream after stream of hot jism. Karen gasped in relief, since she had been only seconds away from cumming herself. They both flopped over on the bed for a few seconds. Slowly Karen managed to crawl out of bed and ran carefully to the bathroom before she began to leak. As she sat on the toilet and Tim's cum ran out of her, he came in and washed off his penis.
"That was something sweetie, I've never seen you so into it," he smiled at her.
"It was β I was just feeling adventurous."
"Shall we go back and get you yours?" Tim grinned at her.
"Oh sweetie, it's late. I really enjoyed that. Let's just cuddle and get some sleep."
Tim seemed skeptical, but Karen managed to get him to settle down, and soon he was asleep. It was not so easy for Karen. She was so frustrated that she almost felt like crying. Plus, her asshole burned and felt wide open as it recovered from the invasion it had just experienced. It took a long time for her to fall asleep.
The next morning Tim was gone early, and Karen padded into the study to surf the web a bit before the kids were up. When she checked her email, there was a message from Nikki.
Dear Slut,
Are you getting horny yet? You ready to fill your bottle again? Be sure to shave your cunt clean, and make sure you're naked and waiting for us when we get to your house this morning. We're going to have fun with you today.
N
Karen's heart began to pound. Part of her was terrified, wondering what humiliating things the college girls would do to her. Another part of her was immediately aroused, and she could feel her crotch moisten as she thought about what they had done to her last time. She jumped in the shower and carefully shaved all her pubic hair again. After she got dressed, she woke the kids, got them fed and ready, and drove them to school. By 9:00 she was back at her desk, sitting naked at her computer. She was still too scared to chat with Duke again, but she did let herself read some dirty stories, and soon she realized she was dripping wet.
When the doorbell rang, she wasn't sure she could go through with it. Part of her wanted to just stay there and not answer the door. But she knew that if she did that then she might lose her chance at another orgasm like the one she had had the other night. Plus, there was always the worry about the pictures. She padded downstairs naked, and peeked out through her door. She could see Nikki and Celia waiting for her. Taking a deep breath, she opened the door wide, and stood naked in front of the two girls. She prayed that no one on the street would see her. The girls looked at her and began to laugh.