Sophie Gilbert had great expectations when she led her father, Keith, by the hand back into the family home. She had planned the whole fantasy out in the car. They were going to sneak in and up the stairs towards the master bedroom, where they would find her brother Jason on the bed with his 10.5 inch cock being worshipped by two gorgeous redhead BBWs. Those two big women being her mother Alison and her sister Sarah, of course. After the initial shock wore off, Sophie was going to fish her fathers throbbing cock out of his trousers and offer it up to her mother and sister. Having had her fill of daddy dick over the weekend, the petite teen nympho would skip across the bedroom, shedding her clothes as she went, and impale herself on her brother's enormous slab of fuckmeat. For Keith it would be a chance to not only fuck his ex-wife again, but also fuck a younger clone of her at the same time in the form of his eldest daughter. For Sophie, she would finally satisfy the craving in the depths of her pussy that she had been feeling all weekend, depths that her father's impressive tool couldn't even reach. Fucking her daddy was was of the most incredible experiences of her life, but fucking her horsecock brother was on another level again. Reality, unfortunately, appeared to be falling short of Sophie's expectations.
The rest of the family had not been fucking each other's brains out when she and Keith arrived, but were instead sitting around the kitchen table enjoying lunch. She had already told her father about how the family home had turned into a den of incest, and the first thing she did when she walked through the door was proudly announce that daddy was ready to join the family orgy. Alison did not take this piece of information particularly well.
"Our daughter, Keith?!" she had screamed, making everyone thankful for the good insulation in the walls. "Our youngest?! Our baby girl?! You've been fucking her?!"
"Are you serious?!" he shouted back. "You've been fucking all our children and somehow I'm the bad guy because Sophie seduced me? So it's alright for you to jump on Jason's dick like a bitch in heat but our daughter throws herself on my cock and I'm supposed to say no? What the fuck Alison?!"
The parents had then taken their argument to the bedroom and slammed the door behind them, leaving their three adult children in the kitchen. That had been over half an hour ago, and there had been no sign of them since. Sophie was on the verge of tears. What if she had ruined everything because she couldn't keep her clothes on for one weekend? She sat in Jason's lap and buried her face in his chest while he stroked her hair.
"Look Sophie," said Sarah, breaking a long silence, "last time we had a situation like this Jason had to go up and talk to you. I think it's your turn to check on mom and dad."
She had a knot in her stomach as she went up the stairs. Were they still fighting? Sophie had never heard her parents shout at each other before, even during the divorce. Why was her mother so upset? Her dad was right, she had been fucking all three of her children for over a week now, and not always all together. More than once while Jason and Sarah were sneaking off to the basement, Sophie had found herself showing her mother the pussy eating skills her best friend Melanie had taught her. It was hypocritical of her to be angry at her ex-husband for enjoying the same forbidden fruit she herself had been feasting on. As Sophie grew closer to the master bedroom she could hear her parent's voices, and she prepared herself to interrupt their fight to give them a piece of her mind. And hopefully a piece of her ass too. She soon realised, however, that the noises emerging from behind the closed door were far from angry.
"Oh fuck Keith, I've missed this big fat cock so much!"
"I love the way your belly jiggles while I'm fucking you, Alison. Oh my fucking god. I've never found anyone whose belly looks so fucking sexy."
"Are you going to fuck Sarah too? She's got a nice big belly for daddy, uuuugggghhhh Jason loves the way our bellies jiggle for him too."
"Do you think Sarah would want to fuck her daddy?"
"It sounds like Sophie sure did. Just like her mother, caught one look at that fat daddy dick and it was game over. Fuuuuuuccckkkkk right there baby! I'm sorry I freaked out at you earlier. I should have known our daughter was the instigator but you both caught me by surprise."
"I'm sorry too. Fuck me I've missed these fat tits! Honestly I think it's hot knowing our son has been ploughing his mommy's cunt in my absence."
"As hot as thinking you were knocking up our daughter?"
Any intelligible words were replaced by animalistic grunting, passionate moaning and wet slapping then. Sophie stood outside the bedroom listen to her mother and father fuck each other's brains out for the first time in years. One hand was under her t-shirt, molesting her tiny braless tits. The other was down her short furiously rubbing her throbbing clit. There was a flood of moisture in her panties, and she would have happily made herself cum over and over against the wall. Suddenly, she remembered that there was an almost constantly hard brother and an ever willing sister waiting for her back in the kitchen, and almost sprinted back down the stairs.
"Take your clothes off now." she ordered both her siblings. "Trust me, mom and dad aren't fighting anymore but I really need you guys to fuck me before they finish and come back."
*
It ended up being about three hours before Keith and Alison came back down the stairs. The sibling threesome had moved from the kitchen to the living room, sans clothes. The first thing that their parents saw when arriving, both in fluffy dressing gowns, was their youngest daughter held aloft in the air. She was sitting on her brother's shoulders while he sat on the couch, his hands gripping her ass cheeks to hold her pussy against his mouth. Their eldest daughter was grinding on her brother's cock, her tongue buried in her sister's asshole.
"Mmmmmmmmm fuck daddy," Sophie moaned, looking over at her parents, "Sarah is almost as good at licking my little asshole as you are."