Jason shifts on his bed as he slowly wiggles out of his clothes, exposing his blonde fur. Hearing the front door open, he quickly stands up and turns off his light. The young teen golden retriever breathes heavily as he listens through his door. Normally he would be at his mom's place at this time, and she would drive him over to visit his father and half sister for the weekend. This time though he told his mom he was going to hang with a friend and they would drop him off; even though he went straight to the bus stop and got here early.

"Kimmy! Come inside!" Jason presses his ear against his door as he hears his dad say something to his little half sister, but couldn't quite make it out. He smiles as he hears the front door close, then rushes over to his closet. Waiting in silence for a few moments until he faintly hears another door close. Leaning forward he looks through a small hole he made earlier in the wall. 

His paw quickly goes to his sheath and gives it a squeeze as he sees his little sister putting down her backpack. She wore a light-pink, frilly top and a slightly darker pink knee length skirt. Jason's tip peaks out of his sheath as his father comes into view; he picks Kimmy up and gently lays her down on the bed before taking off his shirt. Jason inhales as his member quickly slides out of his sheath and into his paw, he thought his dad was fucking his sister, but wasn't sure until this moment. He lets out a soft, jealous growl as his dad pulls Kimmy's panties off and bunches up her skirt around her waist.

Slowly Jason starts to stroke his member. His father taking off his pants and underwear both at once; his already erect cock bouncing into view and Jason couldn't help but compare it to his own. He huffs as he stares at his father's cock, judging it to be around 9 inches long including the knot, even bigger then his at 7. 

"I'm only 14, I'm going to have a bigger one then you one day." Jason quietly grumbles to himself. 

He gasps as his dad grabs Kimmy's ankles and pulls her part way out of sight to the edge of the bed. Shifting from side to side, Jason tries to get a better angle to see what was happening. He could only see his sister from the shoulders up though no matter how hard he tries. Suddenly she lets out a yelp and he sees his father's paw shoot forward and wrap around her muzzle. She lets out muffled whines that filter through his paw as she is pressed forward. Jason grumbles that he can't see it but starts to stroke his cock anyways as he watches his sister's face. She is only ten, he wonders how much of their dad's cock she could take at that age.

Jason presses his muzzle hard against the wall, watching closely as Kimmy starts getting rocked back and forth. Her little paws tugging on their father's, after a few moments he let her muzzle go. 

"You said I could ride today!" Jason's jaw drops before his dad responds. 
"Your brother is going to be here soon, next time sweetie." The rocking starts to go faster. 
"But you promised!" She whines loudly, Jason's cock twitches as she moans. 
Their father sighs "How about a compromise for my little angel?" 

Jason let out a whine of his own as his father pulls his sister fully out of view, but that whine was cut short and his tail starts to wag furiously as they came back into view. She is straddling their father’s lap. Her fluffy tail holds her skirt up; although it is hiding the view of her privates, he can see her cute, little butt. Kimmy's ear twitches as their father whispers something into her ear, slowly lifting her up as he did. Jason watches as their father quickly pulls Kimmy down onto his cock; her tail lifting out of the way giving him an unobstructed view of the action.

He starts to stroke his cock faster as he saw her puffy ten year old slit spread wide by their dad's pulsing cock, his huge knot already formed and bouncing her off of it. Their dad glances to something out of view before gripping her hips tightly. 

"Your brother will be here in 15 minutes, have to give you time to clean up." 

Without waiting for her response, he quickly starts pounding up into her. She moans loudly, making Jason grunt, his own knot starting to form as he lets his digits drift over it.

"Harder, Daddy!!!" Kimmy yells, her muzzle quickly getting shut by their father's paw once more. He shushes her before letting her muzzle go and leaning back.

Jason quickly pumps his throbbing member as he watches his dad pound hard up into his sister. It didn't take long until Jason grew close to finishing, his paw stops moving. He wanted the good feelings to last, but his paw started to move once more as he saw their father slam her down on his knot over and over, cum leaking around it each time. Jason's body tightens up as his own cock throbs hard, leaning back he lets out a sigh. He cums hard, painting the wall and floor in front of him with his seed. 

Jason pants as he leans forward planting his paw on the wall as he peeks through the hole again. His paw, slick with cum, slid across the wall. With a panicked squeak, he hit his head on the wall. He swallows hard, shakily looking through the hole once more, making eye contact with his dad.