Only a week ago Brian was depressed at the prospect that he was about to leave for Iraq for a year and was still a virgin. Thanks to his older sister Katie, his depression is gone and he's now getting all the pussy he can handle. Katie also enticed their sister Sarah to join her in fucking their brother.
Since Katie was at work and Sarah at school Brian spent the day with friends. It was late afternoon when he arrived home and he looked forward to later in the evening when he would probably be fucking one or maybe even both of the girls after their parents were asleep.
He was astonished when he stepped into his room and saw that his small bed had been replaced with a huge new king size bed. "What the hell," he thought. "Maybe they are turning my room into a guest room?" He slipped out of his clothes and went into the shower to get ready for dinner and maybe some fun later.
Brian was watching TV when the rest of the family arrived home from the days activities. His mother and sisters prepared dinner and his dad joined him watching the news on TV. Soon they were called to the dining room for the evening meal.
They all made small talk as they enjoyed dinner. Finally Brian decided to brooch the subject of the bed.
"What's with the new bed in my room? Are you turning it into a guest room?" he asked.
His mother smiled and replied, "You might say that. Your father and I discussed it and we decided since you are having guests you should have a larger bed."
"Guests? What guests? Why would you think I'm having guests?" he asked.
His mother laughed. "I do the laundry so I know everything that happens here. I can tell by the stains on your sheets that there has been a lot of activity in your room this past week."
Brian looked embarrassed and both girls had that 'deer caught in headlights look'. "But I haven't had anyone over this week", he said.
"I know," his mom smiled. "So I suspect the recent activity is with one of your sisters. Which one?"
Brian said nothing as he swallowed hard knowing he was cornered. The girls were frozen in place.
Their mother looked at each one and then exclaimed, "Oh my god, you're fucking them both, aren't you?"
They all sat in silence as words avoided them.
"Is this something new or have I just missed the signs up until this week?"
Finally Katie thought she should take responsibility since the cat was out of the bag. "It's like this, mom. Brian was depressed because he was a virgin and I couldn't stand the thought of sending him off like that."
"You mean still no pussy after four years of dating Jennie?" Their dad looked surprised.
"Not even a hand job," Katie laughed.
"What about Sarah?" mom inquired.
"She walked in on Brian and me a couple of times and decided to join the fun."
"Quite frankly I'm amazed it took this long. I thought he'd be nailing one of you a lot sooner," their dad chimed in.
They all looked surprised. "You aren't upset?" asked Katie.
"No," mom replied. "Like your dad said, we really thought you'd start a long time ago. There is nothing wrong with a little family fun."
Katie was amazed. "Wow, I wish I'd know you were ok with it. I've wanted to get it on with Brian for years."
Their mother smiled. "I know what you mean. I felt the same way when I was young."
"You mean you thought about doing your brother?" Katie asked.
Their dad grinned. "She did more than think about it."
Brian looked shocked. "You mean mom fucked her brother and you're ok with it?"
"Well, He fucked his sister," their mother laughed.
"You mean you both fucked your siblings? No wonder it's in our blood." Katie said.
Their mom took a deep breath and looked at her husband. "I guess it's time we told them."
"I suppose this is a good time," their dad replied. "Your mother and I are brother and sister so it wouldn't be reasonable for us to object to what you are doing."
"So that's why we got the bigger bed. There is no need to sneak around. Brian will only be here for another week and I think it would be nice that he leave well satisfied. You won't have to wait until you think we're asleep," their mother giggled.