It all started when my youngest turned 18. Brittany was a beautiful now woman and she loved the changes her body had made and flaunted them whenever she could. My oldest Justin was 19 and he had no plans for college just working and living at home with me and my wife Cynthia.
Brittany was a complete Daddy's girl while Justin was a Mommas boy. Brittany and I were very close and she was comfortable telling me everything not so much with her mom.
"Dad?"
"Yes sweety?"
"I think mom is cheating on you."
"What makes you think that?"
"Well I heard her moaning and begging to be fucked harder through an open window when I got home yesterday. But when I loudly came in it was quiet and only Justin and Mom were there."
"I bet it was her toy she was using"
"I don't know dad I thought I heard someone grunting at the end."
"Well unless we see it happening it's all speculation."
"True"
The rest of the week she would try and sneak into the house to catch her mom in the act but just like the first day it was only Cynthia and Justin at home.
That Friday "Hey dad, let's go out to a movie tonight."
"Don't you want to go out with you friends on a Friday night."
"Nope I want to go out with you tonight, maybe dinner as well"
Cynthia got excited and said "That's a great idea why don't you to go out and I can do something with Justin. Just call if your going to be home late ok"
"Sure Mom"
I went and got changed as Brittany did as well. As I waited Justin got home and Cynthia told him of our plans.
He smiled as well and said "Mom we should go do something next weekend like go to Orlando or the beach together."
Cynthia turned to me and asked "what do you think about letting me take Justin for the weekend leaving the two of you here."
"I would rather go camping with Dad than sit in the house all weekend."
"That's a good idea why don't you two go camping then next weekend and we will go to Orlando."
Brittany was wearing a denim skirt and a simple white tee shirt. She grabbed my hand, purse tugging me to the truck.
We got in and headed to the mall.
"Dad pull over here."
"Why this isn't the movie theater"
"I don't want to see a movie.I think I figured it out so I placed a spy camera in your room earlier today. I want to see if I am right."
She played with her phone and then set it on the dash so we could both watch and listen.
"I figure we have about 4 hours before they get home. So let's getting going." I heard my wife say.
She entered the picture nude and soon another body joined her. She peeled his shirt off kissing him deeply. My heart sank watching this. Brittany hit record on the camera. Cynthia dropped down to her knees and slowly removed his pants and began to Bob her head up and down on his shaft. I looked away at Brittany who was breathing hard as she had her hand up her short skirt.
"What are you doing?"
"This is fucking hot and I am turned on so I am going to deal with it" Brittany replied.
I started to get hard watching her expertly work herself over. I returned to the phone as I watched Cynthia take his first load down her throat. She stood up and laid on the bed as he climbed between her legs and started to eat her out.
"Oh Justin your so good at licking me oh god so good"
"WHAT!" Brittany screamed.
I was in shock as I continued to watch. I figured she had been unfaithful for awhile as she would not let me touch her anymore.
"Almost there keep pumping" came from the screen
"I am about to cum Mom"
"Cum in me put a baby into me! Ahhhhh I feel you sending your seed into me.... Soooo goood."
He collapsed on top of her spent. She wrapped her arms and legs around him holding him in her.
Brittany hit stop. And the camera stopped recording.
"Dad you ok?"
I didn't know how to feel and I didn't answer.
"DAD!"
Cynthia began speaking again. "Justin your as good as your father and your cock is the same. You use it well"
"I have seen dads cock and he is much thicker than my skinny cock."
"Well I am telling you your the exact same and he isn't your father."
"Your biological father is my dad. I have been sleeping with him since I turned 18. He made me promise that I would only have his kids."
"Brittany was an accident with your dad so technically she is your step sister. Your grandfather was extremely pissed at me and wouldn't touch me except to screw my ass."
"Before he died he made me promise that you would take over for him and produce as many kids you wanted with me"
"So now your the only man that will cum in my pussy. I just hope your dad can forgive me and find someone to keep him happy as well. I was hoping he would start screwing Brittany that way she could enjoy what I had with my own father."
"Mom that's totally fucking wild. When are you going to tell dad about us and you wanting a baby with me."
"I don't know"
Brittany turned the phone off. "Oh my god"
I was shaking. I started the truck and started to drive.
"Where we going dad?"
I got on the freeway heading east.
"DADDY!"
"Yes hun I am sorry I have no idea where I am going I can drop you off and give you money for an Uber but I need to get away for awhile"