Cum is Thicker than Blood

Your sister starts to walk in and stops short.
"What. The fuck."
You are too enraptured with your cock to care, having now lifted your hips to push it deep into your own mouth. The taste of your cum was heavenly, and it made your hips buck, which only **** it even further.
"What the fuck are you doing?! I can't believe you!!!" Your sister yelled, still standing at the door. "You could have at least waited for me."
Fishing her own swelling member out of her pants, she walks over and sticks the head next to your face. With a pop, you release your cock and dive onto your sister's.
"Mmmm. Ohh. Mo-mmmmm-mom and daddy are already downstairs fucking"
Your sister moans breathlessly as you devour her cock. Reluctantly, you manage to pull yourself away just as a load of her spunk coats your face. Before you go downstairs to join the debauchery, you hear a voice in your head:

//SPREAD//

Your eyes glance at the discarded phone beside you, still playing the cursed video...

Two minutes and one email later, you descend the stairs to the kitchen. Your mother is bent over a chair, taking your father's fat cock from behind. Seductively, your sister saunters over to where your mother's mouth hangs open, cries of bliss ringing out as she spurts a load of cum out of her own cock. Without hesitation, your once-conservative mother greedily slips her lips around the member presented to her. You walk over yourself and crouch behind your father's generous behind. Reaching up, you cradle his balls, feeling how full they are with the same spunk that made you.

"Go on Daddy,"

you coo,

"Cum in her pussy. Give us another sister. Make another daughter to help empty your fucking balls."

Your father groaned, as torrents of hot cum erupted into your mother. As he pulled out, you latched on to his cock, tasting both of them together.

"Mmmm Lora baby, you really know how to play dirty."

Your father moaned, grasping at his massive titties. Staring up as you bobbed up and down his length, you couldn't wait to have them wrapped around your own cock.

"Let's see if you fuck as well, though."

He pushes you off and turned around, presenting his fat ass to you. Your mother, still buried in your sister's crotch, was furiously jacking herself. She gagged and groaned as cum blasted out her too, coating the underside of her own boobs. As you felt yourself slide into your father, your only thought was how right this felt.