Author's Note: While this story and its various chapters are primarily incest themed, it will often contain things such as excessive cum, anal play/pegging, and whatever else amuses me at the time. Reader discretion is advised.
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Emily awoke to a day that seemed like any other day. She yawned and stretched, and debated going right back to sleep. Then she remembered what day it was. Her eyes opened wide and a big smile spread across her face. It was her little brother's eighteenth birthday.
She leapt out of bed with newfound enthusiasm and examined her lithe, naked body in her full-length mirror, as is traditional for female characters who have just been introduced. Having reassured herself that she was just as sexy as ever, she headed for her brother's room. She padded down the hallway as silently as a ninja. Her mother was probably up already, but her older sister Lilith would almost certainly still be asleep. It would never do to wake her up prematurely.
Emily cracked the door to her brother's room and peered in. Jaime was still snoring away. Good. She tiptoed closer, then paused as she realized she probably shouldn't wake him up while still completely naked. It might freak him out; after all he was a newly-minted eighteen year old, as inexperienced and naive as any other Littown teenager. She grabbed one of Jaime's shirts and put it on. It came down just far enough to cover her pussy and butt. Good enough.
"Wakey wakey!"
Emily pounced on her brother like a cat. Her face was mere inches away as his eyes opened and he yelped in surprise.
"Jesus, Em. You scared me."
"It's your biiirthdaaay," she replied in a singsongy voice.
"Yeah, I know."
"So you gottaaa get uuup."
Jaime groaned. "Shouldn't I get to sleep in if it's my birthday?"
"Nope. Gotta get up. Much to do. You don't want to be late for your first day of Over Eighteen School."
Jaime groaned even louder. He'd forgotten about switching schools today. But he was eighteen now, and as was traditional in Littown, once you were that age you had to move to a new school where everyone else was sexually legal as well. It made things simpler.
"C'mon, Jai," Emily said impatiently. "It'll be fun. We'll be back in the same school again."
She started shaking him to try and rouse him quicker. Her movement caused her to accidentally sit on his morning erection. They both felt the contact, but reacted very differently. Emily smiled to herself, and Jaime just tried to pretend nothing had happened.
"Ok, I'm up," he said, hoping that would be enough to get his sister off his back, so to speak.
Emily stood up, then waited for him to follow. She raised an eyebrow when he didn't get out of bed right away.
"Um, some privacy please?" he said.
"Why?"
"'Cause I'm not dressed."
"Ooh, you sleep naked too?"
"Out, Em." He pointed toward the door. "And stop wearing my clothes."
"Fine," Emily said. "But if you're not out soon, I'm coming back for you. And here's your shirt back."
She pulled Jaime's shirt up and over her head as she walked away, casually tossing it back in her brother's direction. He stared disbelievingly at the brief flash of his sister's naked backside before she was gone. He couldn't imagine what had gotten into her this morning.
Whatever the case, it certainly didn't help get his erection down. Jaime was fully cognisant of how super fucking hot his sister was, he just did his best not to think about it. Sometimes, like this morning, she made it impossible. He sighed and grabbed his cock. He'd have to rub one out quickly before she came back looking for him.
Very much unbeknownst to Jaime, Emily hadn't gone very far. She'd deliberately left his door cracked open as she left, and was now peering intently through the gap. She was still naked and could theoretically be caught by her mother or sister at any moment, but the risk was worth it. Her sexy--now fully legal--little brother was jerking off furiously, and she was fairly certain he was thinking about her while doing so. She was getting such naughty tingles from the whole situation.
Emily slipped a hand down to her pussy and fingered herself as she spied on her brother. He looked so enticing that she wanted to run back in and jump him, but of course that would just freak him out. Also it would be incest and bad and illegal and blah blah whatever.
Jaime came fairly quickly. Thoughts of his naked sister spurred him along nicely, as well as his natural teenage horniness. He shot a huge load into the shirt Emily had discarded before wiping himself off and throwing the shirt in his laundry basket. He knew he needed to get dressed and out of his room quickly before his sister returned.
Emily took a second to picture her brother dumping that same load of cum on the shirt while she was still wearing it. Her pussy gushed at the thought, but she didn't have time to stand there and continue playing with herself. If she didn't move she'd be caught for sure. She happily flounced back to her room and finally put some clothes on.
Jaime, much to his confusion, made it downstairs to the breakfast table before Emily. Further confusing him was his mother's appearance as she delivered his food.
"Happy birthday, son!" Christine said as set his plate down in front of him. "Pancakes, bacon, and eggs. Your favourite." She kissed his forehead lovingly. "Hang on a sec and I'll grab you some orange juice. Big day today, after all."
"Mom, what... I mean, thank you," Jaime said, remembering his manners. "But what are you wearing?"
He could see what his mother was wearing, of course, but he couldn't believe it. She was clad in her usual full-length cooking apron, a pair of panties, and nothing much else. First his sister's antics, now this?
"I know, dear. I wanted to make sure I had breakfast ready for you today, and I didn't have time to dress properly." Christine grinned at the bright red colour her son's face had gone. "I know it's weird seeing your mother this way, but you have to admit I don't look half bad for my age." She did a quick twirl to show off her sweet milf figure.
"You are super hot, Mom," Jaime admitted. In fact, as far as he was concerned, she had a luscious ass any porn star would be jealous of. But she was his mother, dammit. "You usually, like, cover up more though," he hinted desperately.
"Don't worry, I'm going to go get dressed in a minute. Just had to make sure my baby was taken care of on his most important birthday."
Christine gave Jaime another peck on the forehead. She turned to go get his juice just as Emily finally showed up. She'd taken the time to select a tight, sexy outfit and put her hair up in pigtails. She whistled when she caught sight of her half-naked mother.
"Damn, Mom. That's a hell of an outfit."
"Oh stop. Just running short on time this morning is all. Besides, everyone in the house is eighteen or older now so it's not a big deal."
"That's true," said Emily, grinning at her brother who was studiously ignoring both of them. "Things might just get a little looser around here now."
"Behave yourself," Christine admonished. She gave her daughter a kiss too, then absconded to her room.