Your sisters are satiated...for now.

"Phew, thanks for drying out our deposits, cumdump," Crystal says while gently caressing your bulging stomach. You smile in return. The girls get up and head to the living room. You hear them turn on the TV as you slowly drift into slumber...

You're awoken by your mother shutting the front door. "I'm starting on making dinner right away. Sorry for coming home this late!" you hear her yell. You get up and walk to the living room to join your sisters.

"Hi, Dougie, still full, I see," Crystal says and points at your stomach. You tap it. "Yep!"

"Come sit between us," Crystal says and pats the cushion next to her. You sit.

It's an old season of a long-running sitcom. Two young women, 22 or something, goof around. They sometimes pull out their giant cocks and get into silly situations with them. It strains your suspension of disbelief, but people apparently love the show.

"You know, they actually made some unofficial sex shows a while back," Crystal suddenly says, referring to the actresses. Sarah is still watching engulfed in the show. "They were around 24 when they first started actually doing hardcore stuff," she continues.

"What? I didn't know that. How big were they back then?" you ask.

"I don't know, but I can find a clip of one of their first shows. There should be one heeeeeree... There. Look," Crystal casts a video to the TV.

"Hey, I was watching that!" Sarah exclaims. "You've seen it a million times anyway," Crystal snaps back.

The same actresses from the show you were all just watching are standing in an empty room and getting undressed, looking a few years older. The camera zooms out and we see two young guys strapped down to a PE vaulting horse, lying upside down.

"Wow, those are some huge balls," you yell in surprise. The girls have pulled down their panties and skirts and are showing off their impressive goods. "Aw yih, those will last them long," Crystal says with a smile.

The girls walk over to the boys and press their balls in their faces. The boys immediately start licking. The girls giggle, and their flaccid cocks start growing. They grow to 8", 10", 12"...

"Wow, they're huge," Sarah remarks. "Yup, 14 inches at 12 is not bad at all," Crystal adds. "I wish I had a big cock like them," Sarah says with envy.

The girls on TV are ready to begin the show. They steer the heads of their long cocks towards the mouths of the boys, and with, seemingly, little effort slide their whole 14 inches down the throats of the guys strapped down in front of them.

"Holy shit," you yell in surprise, "they're good!"

For the next five minutes, the women on the TV plow the throats of the boys in long, fast strokes. You and your sisters sit charmed in couch and say nothing. But it becomes clear that their first orgasm is on the way. They retract less and less, and end only pulling out a few inches before slamming their groins into the boys' faces, their giant balls slapping them hard as well.

"Here it comes," Crystal says eagerly. And in that exact moment, the girls slam and keep in their cocks. They're moaning loudly. The camera zooms in on the balls of the closest girl. It's clearly twitching.

The girls keep their long cocks lodged deep in the boys' throats for a whole minute. Their moaning dies down and they slowly pull out.

But they don't pull out entirely. They keep their cockheads in the mouths of the boys for a few moments before slamming their cocks down the throats again.

"Woah, they're still hard," you say. "Yup, they continue exactly like this for a few hours. They actually empty their balls into the boys' stomachs," Crystal says.

And just like nothing had happened, they continue to fuck the boys' throats hard with the whole lengths of their cocks.

The clip skips ahead until a few minutes before their next orgasm. It's a cut-down version of the original movie, but it's still almost half an hour long. You look at your sisters and see their bulges and wet spots. You decide to help them the only way you know.

You get down on your knees before Sarah. When you grab her pants, she looks in surprise at you. You slowly unbutton and zip down her pants, keeping eye contact with your little sister. She pants lightly and raises her bottom, so you can pull down her pants. You only pull them enough to not obstruct the freedom of her cock. You run your hands up her thighs and hips and grab your panties which you slowly pull down to her pants.

Her semi-erect cock jumps up; a string of precum connects the tip of her cockhead to her precum-soiled panties. You lean in and suck on her smooth balls, taking both testicles into your mouth. You suck gently on them as if you were enjoying a rather large piece of dark chocolate. You twirl your tongue around her balls. She whimpers and her cock jumps to its erect form in matter of seconds.

You let her balls fall out your mouth and run your tongue along the underside of her thick shaft, licking up precum trying to escape. You reach her head and wrap your lips around the tip and with a constant motion let in her cockhead and shaft into your mouth and down your throat without slowing down. You’re thinking to yourself how good you’re at deepthroating without gagging. And it’s your first day.

You listen to the sounds of the deepthroating on TV, trying to match them in speed. They’ve just restarted their facefucking after cumming a second time so you can easily keep up their pace. And it seems to have a positive impact on your sister. She’s very into the video, and your oral service is making it hard for her to keep calm.

For the next few minutes, you slowly increase your pace to match the girls on the TV. Your older sister hasn’t even noticed what’s going on, but Crystal has an unmatched attention span; a war could break out just behind her and she wouldn’t notice.

The girls on the TV are close to cumming for the third time. You feel Sarah’s cock tense up. That’s your cue. You try and pull out so you can drink her cum, but she’s so into the action on the TV she grabs your head and forces your face into her groin as the girls on TV stop and cum themselves. She already forgot Crystal’s advice about letting boys taste the cum of girls.

As Sarah is cumming down your throat, you hear your mother in the doorway...