Nate was laying on his bed, scrolling through his phone, when he heard his sister Kaya bound down the stairs. Instead of making a slight left into her bedroom, she shot straight ahead into Nate's room. She leapt onto the bed next to him, lying on her stomach.
As she propped herself up on her elbows, she prodded Nate. "Hey, whatcha doin'?"
"Not much. Just on Insta. What are you up to?" he asked.
"Absolutely nothing. Trying to stay away from mom so I don't get roped into watching the twins this afternoon," Kaya explained.
"Solid. Any plans for later?"
"Nope. Just hangin' out and probably diddling myself." Kaya smirked out of the corner of her mouth.
"Jesus, Ky..." was all Nate said.
Kaya was wearing a pair of blue short exercise shorts and a spaghetti strap tank top. As she talked, Nate was getting a nice view of her small cleavage as the tank top hung a little bit off of her chest. Kaya didn't have large boobs by any means, but what she lacked in that department she made up for with a great ass and an absolutely adorable face.
"If you take a picture with your phone, it'll last longer," Kaya said as she poked her brother in the side.
"Take a picture of what? Not much to see," Nate chided Kaya. She responded by poking him harder in his side. "HUSH," she hissed.
"Besides, not like you wouldn't try to sneak a peek if you saw something that you liked. And don't try to pretend you don't know what I'm talking about."
"Whatever, Natey."
Nate was the oldest of the four siblings in his family, with Kaya only about a year behind him. After his parents had Kaya, they decided that having two small children at one time was enough, and decided to stop. Many years later, though, the family was rocked with a surprise when his mom turned out to be pregnant again. Another surprise shocked everyone when she went to her first OB appointment and found out that she was pregnant with twins!
That set in motion a series of events that had pulled Nate and Kaya closer together as siblings for the years to come. Right before the twins were born, Nate's parents had moved Kaya down to the lower level with Nate. This was in order to make room for the two nurseries upstairs, so they could be next to their parents' bedroom.
The only problem was that there was only one bedroom downstairs at that time. Nate's dad had hired a contractor to finish off the rest of the lower level, installing a TV room, another bedroom, and finishing off the bathroom. But that took some time, and so for a few months, Kaya shared Nate's room with him. Not that he minded, Kaya was a great sister, and a good roommate to have. They talked all the time in those days, sometimes late into the night when they were supposed to be fast asleep.
Even after Kaya's new room was completed and she moved out of Nate's room, the two continued to be close. They had developed a sort of comfortability with each other. Almost a sibling intimacy. And as they both grew older and out of their awkward teen years, both had started to take notice of the other as they developed. For Nate, Kaya's ass had formed into a nice round shape from her years running track. Kaya had always admired Nate's sleek physique and loved looking at his abs when he took his shirt off.
There were lines that they didn't cross, though. Although they felt free to change clothes in front of one another, Nate had never seen Kaya without her bra and panties on. Likewise, she had never seen him without his boxers on.
Nate had come close one time last summer, though. One day, he ran downstairs to tell Kaya something, not bothering to knock on her door before entering. He walked in right as she was pulling on a pair of panties, getting a fantastic look at his sister's perfectly round ass. She had finished pulling on her panties, and startled, jumped and whirled around to face Nate. "Nate!" She hadn't gotten to put a bra on yet, so she had her left arm covering her chest. "Out!"
Nate had apologized profusely and exited her room, backing into his own.
Once she had dressed, she came over to his room to chat, clearly taking notice of the erection Nate had developed after seeing his sister partially naked. Later that afternoon, Kaya had been called by their mom to help with the twins. Nate took the opportunity to run to their shared bathroom, and standing at the toilet, closed his eyes to recall the image of Kaya's ass and jerked his cock a few times and exploded cum into the toilet bowl. It was the most intense orgasm that he had ever had.
Over the next few weeks, it was as if Kaya was trying to get her shot to see Nate in a state of undress. She constantly was just walking into his room at times when he would be getting ready for the day, trying to see him without clothes on. This is what he had referred to in their exchange this afternoon.
But something had changed recently for both of them. Kaya had become more careless about leaving the door to her room open as she was changing and even peeing without completely closing the bathroom door. Nate had noticed the changes. In response, Nate had become more careless about hiding his erections around his sister.
Their conversation was abruptly interrupted when their mom appeared at the doorway of Nate's room, holding some folded towels for their bathroom. "Hey, you two. What are you up to?" she inquired.
"Nate's been on his phone watching porn," Kaya quickly shot out, teasing her brother.
"NATHAN!" exclaimed their mother.
"I am not! Jeez, mom, take it easy!" Nate responded while smacking his sister's lower back with the back of his hand.
Their mom laughed. "Oh, you know I don't mind if you watch some of that stuff every once in a while, Nate. But maybe just not in front of your sister and behind a locked door?" Her eyebrows perked up as she looked at her son's slowly reddening face.
Nate grumbled something inaudible as his mom turned and put the towels on top of the sink countertop in the bathroom. "Please put those away when either of you have a chance," she said. Then she turned and headed back upstairs.
"Thanks alot, dork," Nate scowled at Kaya.
Kaya giggled uncontrollably. "Just getting you back for sneaking a peek at my boobs," she said.
"Again, what boobs?" Nate teased back.
Almost instantly, Kaya sat up on his bed. "These ones, idiot," as she quickly lifted up her tank top to reveal her small, perky, beautiful nipples. Just as quickly, she yanked her top back down, stuck her tongue out at Nate, and hopped off his bed.
As she was leaving his room, she looked over her shoulder and gave him a sly smile. Then she was gone.
"What the fuck just happened?" Nate said under his breath. Something was definitely going on between them. The level of tension had never been this high for either of them.
