Sibling Rivalry

Max wiped off the remaining cum off his body, enjoying the taste. standing up, he stretched his slightly sore muscles. moving over to the wardrobe, he looked past his brothers massive sex toy collection and found the draw where he kept his clothes. Max smiled fondly, ever since he turned 18 a few years back, he stopped wearing anything except jockstraps, he couldn't exactly remember why he did, but he had to admit that jockstraps felt incredible. looking through the drawer, Max picked out a black and orange one made of a rubber like material, he slid it on, moaning slightly at how it held his cock tight. he quickly grabbed an item from on of his brothers drawers before closing them. Max then left his room, groping his bulge as he thought about what to do next, he could go see his parents if they were still fucking, go find his sister, or join his brother in the shower.

after thinking for a moment, Max decided that he'd see what his sister was up to then go join his brother. walking downstairs, Max could hear a sound coming from the kitchen. entering the kitchen, he found his sister cleaning the dishes. Jill was wearing her usual attire, a full body latex suit that covers everything except her mouth, pussy and ass. she was wearing platform boots today, adding a few extra inches to her height. as Max entered the room, he coughed loudly to get his sisters attention.

"ah, Master Max." Jill turned around, her watermelon sized tits bouncing wildly as she made a kissy face with her matte white DSL's. "How can Jill-bot assist you?"

Max grabbed Jill's breasts and played with them. "just checking on you."

Jill didn't visibly react to the groping as she responded. "Jill-Bot is doing her tasks. afterwards, she'll recharge then report to Master Andy's room for relief duties."

"alright then, I'll leave you to it." Max said as he kissed his sisters latex cheek before spanking her, making her squirt a puddle onto the floor.

Max walked back upstairs where he could hear his parents fucking in their room down the hall, chuckling to himself, he opened the door to the massive bathroom where her could see Kevin's clothes piled up neatly. Kevin, meanwhile, was in the shower humming to himself as he went through his self care routine, ignoring the fact that Max was sneaking up behind him.

"showering all by yourself, little bro?" Max asked as he pressed himself against Kevin's back, grinding his bulge against his brothers bubble butt.

"mmm, sorry bro." Kevin whimpered, enjoying how easily Max was overpowering him.

"don't worry, I forgive you. but lets make sure you remember for next time." Max chuckled as he pulled out the item he took from Kevin's drawer, a tiny, steel chastity cage. he placed that cage on the tip of his brother's two foot long fuckrod, and started pressing down, watching as his shaft slowly shrank down to fit in the half-inch cage. with a click, the cage was locked on before Max threw away the keys, leaving his brother with a tiny nub and some fat nuts.

Kevin whined as he felt his cock throb and fail to get hard in his cage. his whining was cut short as Max pinned him against the shower wall. Max then pulled down his Jockstrap and slapped his cock against his little brothers fat ass. Kevin didn't even get a chance to say anything before he felt his brother begin fucking his ass.

Kevin squealed in delight as his prostate got pulverized by his big bro's cock, forcing numerous micro orgasms to hit him, making some cum leak out the cage. but Max didn't stop, he didn't care if his brother came, he just kept thrusting faster and deeper, his pelvis slapping against Kevin's jiggly cheeks, making a lewd clap with each thrust while at the same time his balls slapped against his brothers.

"heh, knew you were an anal slut." Max teased as he slapped Kevin's ass, making it wobble like jelly. Kevin simply moaned as loud as he could as he tried clenching his ass as tight as he could while his hands reached to play with his own nipples, still cumming his brains out. Max, meanwhile, was groaning in utter pleasure as he felt his brother clamp down on his cock like a fleshlight. as he continued demolishing Kevin's ass, he noticed that something was appearing on his little bro's ass, a tattoo reading 'Big Bro's Breeding Bitch.' and on the other cheek, 'Big Bro's cock only.' both the tattoos were in this cutesy font and written in a nice green ink.

Kevin meanwhile, was drooling as his limp body was pressed against the wall and used like a cheap onahole, to him, this was the best day of his life, he loved his big bro, and he loved his big bro's cock bulging out his stomach. Max then grunted and buried himself as deep inside Kevin's asspussy as he dumped a gallon or three of cum inside the femboy's guts.

after finishing his orgasm, Max pulled out of Kevin with a wet pop as he helped his little brother stand before kissing his forehead.

"Love you, big bro." Kevin mewled as cum leaked out of his ruined ass.

"love you too." Max responded before pulling up his Jockstrap and leaving the shower.

(feel free to suggest what happens next, or write your own chapters)