This will make more sense if you read the earlier parts. Don't worry, they're fun, action packed, and build the tension. Read them first! Also, all characters in sexual situations are 18 years or older. Enjoy.
Christmas morning arrived, and the whole family gathered in the main living room to open presents. Julie noticed that the twins seemed to be getting along swimmingly. Close, even for them.
Despite all the disparate strings pulling at Julie, she managed to have a lively, fun, and almost normal Christmas with the family.
Toward the end of the evening, as Daniel sat on the sofa, with Penelope pressed into him on one side, and Brittney pressed into him on the other, Julie felt the first tingling of motherly intuition. Julie had wanted Daniel to find someone his own age, but ... he wouldn't ... she wouldn't ... would they? As she watched the twins laugh together, she realized that of course they would. Daniel and Brittney were both special and incredibly compelling in their own ways. Julie couldn't say no to either one. Why would they say no to each other? It had just been a matter of time. And Julie had no idea what she was going to do about it. Well, the first thing she was going to do was go fetch herself a pantyliner. She was incredibly wet.
~~
Even with a full house, Brittney and Daniel found many moments alone during their winter break. On Wednesday, Brittney rode Daniel on an armchair in the library.
"Have you ... ugh ... ugh ... been with Mom since she ... got back?" Brittney looked down as that enormous dick bulged her belly over and over. Not for the first time, she thought maybe they should use a condom, but then forgot about it.
"Only a little." Daniel lightly smacked her bouncing boob. "You?"
"I've been ... avoiding her." Brittney's body buzzed. Another orgasm was on the way. "She'll notice my ... body ... when I'm ... naked." Her narrow shoulders pushed forward, her face contorted in ecstasy, and her hips went from bouncing to grinding. "Soooooooo ggooooooooodddddd." An orgasm seized her nervous system. When she came back down to Earth, Daniel was smiling up at her.
"Who's better at sex, me or Mom?" Daniel put his hands on her butt and squeezed. She had so much less back there than their mom, but it was still so wonderfully round.
Brittney wiped sweat off her forehead and screwed her eyes at him like he was a moron. "That's a stupid question. Can you answer it? Who's better, me, or Mom, or Pen, or ... Mrs. Samatar?"
"There's also the school principal." Daniel's smile broadened. He smacked her ass and got her hips moving again.
"Shit, Daniel. Mrs. Haskins?" She looked down at her brother with adoration. He could have any woman and he wanted her. What a wonderful feeling. "Really? How did that happen?"
"Long story." He winked at her. "I'll tell you sometime."
"Have you done anything with Mrs. Samatar since she moved in?" Brittney put her hands on his shoulders, bouncing her hips high up off Daniel and then back down.
"Jealous?"
"Yeah." Brittney smiled down at her dumb twin. "But I'm jealous of you. Not her."
"Oh ... you mean you like her?" Daniel let his sister ride him while he thought things over. Her tight pussy moved him closer and closer to the edge. "You ... want to ... have sex with her?"
Brittney nodded. Talking about such perverted things while that massive cock stretched her out was going to make her cum again.
"In that case ..." Daniel leaned up and sucked on her boob while he mustered the courage to make the ask. He released her nipple and looked up into her light-blue gaze. "Would you like to ... um ... do her together?"
"Yes, Danny." Brittney nodded, her body twitching. "That would ... aggghhhh ... be so ... crazy. But life is ... crazy now. Are you ... going to cum?"
"Yes." Daniel gripped her ass tighter. "Inside?"
"Yessssssss, plllleeeeeaaasseeee." Brittney came on her brother, and then thirty seconds later came again as his heat filled her. It was turning out to be the best winter break ever.
~~
"I've always known when you twins were hiding something." Julie stood with her arms folded looking at the eighteen-year-old siblings as they sat on the living room sofa. The Christmas tree sparkled off to the side. "We need to have a talk." Brittney wore one of Julie's oversized sweaters, with a billowing dress underneath. Julie had noticed Brittney wearing lots of formless clothes recently. That didn't help her suspicions. And Brittney hadn't tried to spend any intimate time with Julie since Julie's return. More suspicious still.
"What's up, Mom?" Daniel tried to look innocent. He wanted to hold Brittney's hand, but he kept his hands in his lap.
"If we're in trouble, shouldn't Dad be here?" Brittney brushed her brown hair out of her blue eyes and also went for an expression as pure as the driven snow.
"Your father is in the basement working on that valve again." Julie frowned. Her poor George. The house was obviously toying with him. Maybe Daniel was right, maybe George was a big dummy. "If I'm right about what you two have been up to, I think it's best your father was not here."
"What are we up to?" Daniel shrugged.
"Give it up, Danny." Brittney pressed her lips together. She didn't know what her mom was going to do, but she knew there was no chance Brittney would give up what she was doing with her brother. "Mom knows. She totally knows." Brittney reached with her left hand and grabbed Daniel's right hand. She held it tightly and brought it into her lap. "It was my idea, Mom. I wanted to touch his ... thing. I'm sorry I didn't tell you before."
"Oh, dear." Julie shook her head slowly.
"But I didn't want you to freak out." Brittney's shoulders tensed. "We're both technically adults."
"You are brother and sister," Julie said.
"And you're my mom. That hasn't stopped us." Brittney stuck out her chin.
"Brittney ..." Julie hissed. She looked at Daniel in a panic.
"He already knows." Brittney squeezed Daniel's hand tighter. She hoped she wasn't hurting him. "Don't look at me like that, Mom. I didn't tell him."
Julie's stomach dropped. Everything seemed to be coming to a head. At least George was still in the dark. "Are ... are ..." As she thought of the twins doing unspeakable things to each other, her pussy drenched itself.
"You sound like a pirate, Mom." Daniel's smile was weak.