Jennifer and Mark were enjoying their incestuous affair, they loved each other more than they thought possible, even for twins, but they didn't want that magic to disappear from their relationship.

They went out on dates together, like any other young couple, but only to places where they weren't known and they would always end up fucking each other when they got home.

However, in recent weeks it had all seemed a bit predictable, they still enjoyed it and still loved each other, but they also wanted it to be memorable every time.

One evening they went out to a restaurant and driving home afterwards, Mark pulled into a secluded lay-by and stopped the car.

Jennifer asked him, "Why have you stopped here?"

Mark explained, "Let's try something different, nobody will see us here, we're in the middle of nowhere, late at night."

Immediately, Jennifer was jumping into the back of the car and pulled her panties off from under her short skirt.

Mark got out of the car and opened the rear passenger door, his sister was lying there with her legs open, ready and very willing to receive his cock.

Mark unfastened his trousers and pulled out his large, hard cock. He got in on top of his sister and inserted two fingers into her ever-hungry cunt, feeling the warmth and wetness of it, before licking her juices off his fingers.

Jennifer said, "Are you sure nobody else is around here?"

He replied, "Course they ain't, what would anyone else be doing here now?"

At this point, he pushed his cock deep into her soaking wet pussy, making her groan with expectant anticipation.

Despite the cramped confines of the car, they started pumping cock and vagina together and gaining great satisfaction from the sex and the thought that there could be someone outside watching, giving them the tingle of excitement that they craved.

They held nothing back, both determined to get as much as they could out of the risky encounter.

The sex was cramped but much quicker than normal because of the element of risk and Mark was soon injecting his hot, sticky cum into his sister.

It was a very still night, with only the sound of an owl hooting outside.

Mark and Jennifer regathered themselves and got back in the front of the car to drive home, it was only when they were driving away with the headlights on that they saw the other car with its interior light on and could see a young couple also having sex in the back seat.

Mark stopped the car and he and his sister sat watching the couple, with the young man spread out in the back seat and the girl bouncing up and down on his cock, frequently throwing her head back in ecstasy.

When they got home, Jennifer and Mark were still in a state of sexual excitement, as soon as the door closed in the apartment they were groping each other in the hallway.

Jennifer hadn't put her panties back on so Mark stuck his fingers straight into the entrance of her pussy feeling their cum from earlier and becoming even more aroused because of it.

He lifted his sister and pushed her against the wall, she wrapped her legs around him, and he pushed his rock-hard cock deep into her pussy, immediately she gave a long, drawn-out groan as he entered her.

Mark fucked her hard, with his sister sliding up and down against the wall as her juices flowed around his cock, making him even more aroused.

As his arms squeezed around her and their bodies pistoned up and down while reaching their physical limits, brother and sister refused to give up until his cum exploded into her fertile system and both collapsed on the cold floor from the effort.

Once they had recovered in each other's arms, they slowly got up and went to Mark's bed.

When they stripped off, Mark's sperm was dribbling down his sister's legs, and they wanted to keep fucking so they kept their emotions and intensity bubbling up.

Jennifer threw the cover off the bed and lay on the mattress naked and with her legs spread apart, inviting her brother to fuck her again.

Mark crawled up the bed and buried his face into her hot, wet cunt, tasting his sperm and her pussy juices.

Once again, the thought of a potential pregnancy hung in the air but didn't stop them, they wanted to fuck each other, and any consequences would have to wait.

As he moved further up his sister's body, she could almost smell their cum on him, before tasting them as they kissed again.

Mark reared up on his knees and gently pushed his cock into her sopping-wet cunt.

He told her, "I can't ever get enough of you!"

She replied, "Take me as much as possible, I'm yours and always will be."

He started slamming his dick into her and she thrust upwards at him, her vaginal muscles clinging to his pulsing cock.

Mark and Jennifer had sex like never before, turned on by going dogging and watching others doing the same, it was a powerful feeling, and it showed as he pounded her relentlessly again for the third time in a few hours.

Jennifer panted and then screamed at the pleasure of having her brother's cock as deep as possible inside her, in turn, this turned him on even more and increased his intensity as he fucked her.

It wasn't long before he was shooting a huge wad of sperm into her again with both of them climaxing at the same time, followed by a warm afterglow and genuine contentment as they drifted down from a massive high.

After their breathing had relaxed, Jennifer told Mark, "I haven't started my period yet."

To be continued...