A Brother-Sister Experiment Gone WildAnal Sex Story 

“Why would she do that?” he asked, indifferent. “She knows what she’s here for, and I want to find out how into it she is.”

We agreed that he would stop teasing her for the rest of the meal, and I would leave them alone afterwards.

After lunch, with coffee on the table, Alex said he wanted to have it in the garden. Shocked, we watched as he took off his swim trunks and left them on the back of the chair, picked up his mug, and walked away like it was no big deal. I looked at him with eyes that said “What the fuck are you doing?” but he didn’t care and kept walking. Then I suspected that he was up to something.

Sonia went out to the garden with Alex ten minutes later, and she sat on a lounge chair next to the one he was using. I watched them from the window of Alex’s room.

“Let’s get one thing straight,” Alex said. “You know why you’re here, right?”

“Of course,” Sonia replied, looking him in the eyes and then looking at his crotch. “Laura said you were, too.”

“And she told you that I’m a little peculiar, right?” Sonia nodded, and Alex continued. “I don’t want you to think I’m a macho, it’s just that I like to know how motivated the girls I have sex with are.”

Sonia kept looking at his cock and licked her lips when she heard the word “sex.” Alex got up from the lounge chair and sat on the edge of hers, facing her. He put his hand between her legs and rubbed several fingers over her panties.

“I like girls whose pussies are very tight,” he whispered in her ear. “It’s a pleasurable challenge to open them and find out what they’re hiding,” he added, putting his index and middle fingers inside her vagina.

Sonia moaned a couple of times and bit her lip as Alex fingered her.

“Help me take off my top,” she begged, trying to catch her breath. “It has a zipper, and it’s hard for me to do it myself.”

Alex only agreed to lower the zipper, and then he watched as Sonia took off her top like a professional stripper, making Alex even more excited. Then he saw her small, perky breasts, and her hard, pointed nipples looked even more appetizing than before.

“Now take off your panties,” he ordered, “and walk very slowly to the corner where the grill is, and stop there without turning around. I want to see you shake your ass while you do it.”

Alex wanted to make me suffer with uncertainty about what was happening, since I couldn’t see that part of the garden from where I was.

Alex went to Sonia when she stopped, pressed his hard cock against her ass, and put his hands on her breasts.

“I bet many guys have told you that you have a spectacular ass,” he whispered in her ear as he pinched her nipples.

“I don’t remember how many times they’ve said it,” she replied between moans. “But now, the only thing that matters is that you think so.”

Alex had to flex his knees a little to put his cock between her thighs. She moaned when she felt it rubbing against her pussy.

“My sister says you like anal sex,” he whispered in her ear. “She didn’t tell you a secret, I hope.”

“I like it a lot, and it’s common knowledge among the people who interest me,” she replied between moans. “It would be a secret if we weren’t in this situation.”

Alex was surprised by Sonia’s boldness and willingness, but he still needed proof.

“Come with me,” he said, taking her hand, and together they went inside the house.

I waited by the door of Alex’s room, but they took too long to come up. I walked down the hall on tiptoes and reached the balcony at the end of the stairs.

The two of them were standing next to the dining table, hugging and making out with each other. They stopped kissing, and Alex forced her to bend over the table with her back and stomach on it, her legs on the floor, and her ass in the air.

I was surprised that Alex asked if she had any objections to doing it without a condom. She shook her head and said that she only had unprotected sex with a few guys in her crew that she trusted completely. Alex was so into it that he was already fucking her pussy before she finished explaining. But then he suddenly stopped and watched her as she moved back and forth, more and more insistently, moaning like a bitch in heat. Alex knew then that she was serious and would do whatever he wanted.

He got up, opened the drawer with the napkins, took one, rolled it diagonally, and said:

“I’m dying to try your spectacular ass, and I’m going to blindfold you. I want to deprive you of your sight so you can focus on what’s important. Is that okay with you?”

Sonia took a few deep breaths and agreed, whispering repeated “yeses” in a tone that was so exciting that it was hard to believe it was real.

Alex put the tip of his cock in her ass and slowly started fucking her. She didn’t complain or make a sound of protest, even when he started fucking her harder.

“I see that your ass has been opened up quite a bit,” he said as he fucked her. “It seems that Laura was right.”

“About what?” Sonia asked between moans.

“She said that not only do you like anal sex, but you’re also a total slut.”

Sonia giggled and responded openly and without shame.

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