The start of the four-day Memorial Day weekend holiday had arrived and the Blake family is heading to their Summer cottage. Dad's 1960 Buick LeSabre wagon had been packed to capacity the night before with the supplies they would need for cleaning their cottage which had sat vacant all Winter along with the food supplies to get them through that first weekend.

In order to be at their destination long before the traffic became heavy, Dad insisted that they be up at four in the morning and move out as soon as possible which was a lot earlier than his family was used to so it was no wonder that his wife and kids were sleeping. Mom had propped a pillow against the passenger door and was soon sound asleep.

Kyle and his twin sister Kelly were in the large backseat amid blankets and pillows and struggling to remain quiet so as not to distract their father and attract undue attention to themselves. Mostly it was Kyle that struggled the most to be quiet for his sister was rubbing the growing lump in his jeans with her hand.

"You promised," she said as quietly as possible.

Kyle sighed and somehow managed to unzip his jeans with minimal motion and extract his cock, a task made more difficult due to his erection. A second later with her head resting on her brother's chest, Kelly's soft hand encircled his erection and began to gently stroke him and he had to stifle a moan.

Before getting on the toll road their father had used his rearview mirror to check on his kids in the backseat, he could see that Kelly had leaned against her brother and fallen asleep, a pretty common occurrence during long car trips. He spoke to them but got no response so he knew that they were both asleep. He had a local rock station playing softly and his CB radio was on and occasionally a warning concerning the location of the highway patrol was broadcasted.

Kelly tilted her head up so she could whisper in his ear.

"You like that?" she asked in a breathy whisper.

"I love it," he replied struggling to keep his voice low and extended his right arm across his chest so his hand could caress her right breast.

"What happens when I'm ready to cum?" he asked. "I don't want to make a visible mess."

"Don't worry about it, just let me know when it's time," was her response.

Up until the time they turned sixteen, they had a normal brother-and-sister relationship. Kelly was well aware of just how handsome her brother was but kept it to herself and let her friends make comments about how badly they wanted to fuck him. Kyle went through the same thing with his buddies, they all commented on how sexy his sister was but withheld the comments of wanting to get into her pants at risk of a fight with Kyle.

The teens ignored these comments and life continued on. It was until the Friday before the long weekend commenced that Mandy Coltrain let Kyle give her a feel job under the bleachers. Between the kissing and his hands on her breasts, Mindy had become hot and had just asked him to lose his jeans as she ran her tongue over her full red lips and dropped to her knees to assist him in removing his jeans. Nothing happened because they were interrupted by their friends calling their names, thankfully he managed to redress before they were spotted.

The teens shared one last kiss before going their separate ways. Kyle thought about Mandy on the walk home and by the time he reached his parent's house he was hard again. He flew to his room and flopped on his bed and stripped off his jeans and underwear which allowed his rock-hard teenage to bob in the air as Kyle took a more comfortable position.

He grabbed his rigid manhood and recalled his meeting with Mandy. He closed his eyes and recalled her sweet lips and wet tongue in his mouth and the feel of her soft full breasts under his fingers as he aggressively stroked his hard cock. It seemed that in a matter of minutes until his orgasm arrived and he spewed the contents of his balls all over his belly.

As his orgasm wained he opened his eyes and discovered his sister standing in the open doorway, he had been so lost in pleasuring himself he never heard her announce her arrival home. Kyle managed to grab his discarded jeans and pull them onto his lap in order to hide his slowly withering cock before he spoke.

"What are you doing in my room?" he questioned his sister whose eyes were very wide and whose mouth hung open.

"Watching," she replied with her eyes still glued in the direction of his crotch.

"Did you forget about the closed-door rule?" her brother replied.

"No, except the door was half open. I was just checking in for any messages from our folks as they are late, " his sister responded.

Kyle began to feel a little uncomfortable under his sister's gaze and sought to remove it.

"Just what is so fascinating here?" her brother questioned hoping his question would remove her stare.

"Your cock is perfect," she replied never taking her eyes off her brother. "It's the right length and width and you're circumcised."

Kelly entered his room and sat on the edge of her brother's bed. Kyle thought that she looked like a million dollars in her mini skirt and go-go boots. Kelly was about to ask permission to touch it when the sound of their parent arriving home from work caused her to exit her brother's room in haste. It was over the supper table that their dad revealed his plan for leaving early in the morning, which meant packing the car after dinner.

Dinner ended and the packing began. It was made more difficult for Kyle as his sister lost no opportunity to come up behind him and push her full tits into his back as she reached around to run her hand over his crotch. Kelly had been without a steady boyfriend for a while and it seemed to her that she was horny twenty-four-seven.

Toward the end of the packing session, Kyle no longer avoided his sister when she pressed herself against his back and took hold of the lump in his jeans. In fact, one time just as she commence to push herself into him he managed to spin around and Kelly wound up grinding her crotch against his. Her brother then managed to grab both of her tits for a second and she responded with a slight moan.

"If our parents weren't present I'd give you a blow job right here in the driveway," Kelly responded.

Having his sexy-looking sister offering him oral was almost more than Kyle could handle and he could no longer hide the bulge in his jeans.

"Well, it is a long ride to the cottage. Maybe we can play during the trip," her brother responded.

"Not a good idea, Dad always checks on his passengers, and my head bobbing under a blanket might arouse suspicion." his sister replied.

"You can always use your hands," he informed her.

As she walked away Kyle could not believe what he had suggested, she was his sister. As sexy as his girlfriend Mandy was, she could not hold a candle to Kelly and he couldn't believe that he was now taking in that fact. The packing was finished and the family turned in at about eleven. Kyle had an extensive masturbation session before he was finally able to fall asleep.

Before he knew it his Dad was waking him up saying that it was time to get moving, In short order the teens were up showered, and dressed and then headed to the kitchen for coffee. Kyle had to admit to himself how great his sister looked in her tight jeans as she moved around the kitchen. That was this early this morning, now here he was in the backseat of his Dad's car getting a hand job from his sexy sister.

Suddenly a familiar tingling in his balls told him that his orgasm was a few minutes away.

"Kelly, I'm going to shoot," he told his sister as quietly as possible.

Kyle watch as his sister reached for her purse and withdrew the sexist pair of panties that he had ever seen of black silk and lace. She then carefully wrapped her brother's hard cock in them and the sensation of the silky garment against his manhood was beyond belief.

Kyle's whole body shook as he empties himself into his sister's sexy lingerie. They must have dozed off again because the next thing they knew they were being awakened by their father telling them to wake up as it was breakfast time.

The teens noticed that they were in the parking lot of that small diner not far from the cottage. The moment the parents had exited the vehicle Kelly retrieved her panties from her brother's cock.

"That was fantastic," he told his sister.

"I didn't think you'd finish so soon," she replied as they walked to the diner.

"The feeling of your silky panties did that," he admitted.

"They look as good as they feel," she admitted with a blush.

"I'd like to see for myself," Kyle replied.

"Well, it is a four-day holiday. You never know what will happen," she replied.