Mother Lisa wins

The fight is on! Both ladies ram hard into their boysluts, then wait a second to hear their distressed moans, pull out slowly and repeat, with more **** every time. Each ramming, the girl's cocks hit the deepest parts of their targets without mercy. On the outside, your buttcheeks are quickly reddened from the violent contact of your mother's hips, and your balls take a similar beating from her own, much larger pair.

It only takes a few thrusts before tears are forming in your eyes and your throat is starting to feel dry from screaming out your orgasmic, overwhelmed sensations. Mommy has no intention of going easy.

All the while, the other boy is keeping up, with moans that match yours in volume every time. At the rate things are going, you fear you might lose, which would displease your beloved parent.

You need to put an end to this, and try to finally tell mommy about how you wore the collar to school today. Maybe that will convince her to call off the competition...

Just as another ramming is imminent, you begin.

"Mommy,"

"AH!"

"I w-wore,"

"OOH!"

"The co-collar!"

"IIIH!"

"Today!"

"..."

The next thrust is ever so slightly delayed... but when it arrives it is with full ****, lifting you off the sofa and making you yell out in a scary, teary-eyed orgasm that fills your condom to the point of bursting. Even the neighbours must have heard you. Completely spent, you sink down into the cushions and drool absent-mindedly.

Proud of her accomplishments, your mother smiles down at you, then over at her daughter. "Looks like I win" she tells Sarah, "unless you can beat that?"

Sarah looks fazed, but turns her attention back to the desperately moaning, exhausted classmate she has been fucking for the last half hour. "Come on cockslut, yell louder for me or I'll punish you!" She slams hard into his buttocks, burying her cock as deep as it goes, trying to mimick her mother.

But the boy is too tired, and can only whimper.

Your sister tries a few more times, but it's clearly not going to happen. She sighs, admits defeat and throws her sweaty, delirious boy up on her shoulder, prepared to carry him upstairs again.

"Oh honey. I had forgotten about the collar..." Your mommy bends down to embrace and kiss you, wrestling your tongue down with her own, all the while driving her divine dick deeper down your delicate behind, forcing you to moan into her mouth. "It makes me so happy to hear that my son loves me enough to make it official! I -"

"Hey, mom?" Sarah interrupts, "I was thinking I'd punish my cockslut by tying him up and leaving him with a vibrator in his ass until tomorrow..."

"Sounds like a nice idea," your mother says and plops her cock out of her son yet again, "I'll call his parents to let them know. The vibrators are in my bedroom."

Once mommy has left, your sister, still carrying her cockslut/classmate over her shoulder, walks up to you and fondles your red buttcheeks lightly with her free hand. "You know, brother, the more I see mom fucking you, the more I wanna do it myself. Can I? Some day?"

Still gasping from mommy's kiss, you take a couple seconds to respond. "We'll... see?"

Your little sister smiles, then heads off to go find a good vibrator for her boytoy.

When mommy returns, she has a surprise reward for you.