Free Use Family

"I'm gonna miss you sis," Mark said pitiably, tugging at Megan's heartstrings.

"I'm gonna miss you too dork," Megan said softly as she pulled Mark in for a long hug. "Want one last one for the road?" she whispered into his ear.

Mark nodded glumly; he appreciated having a quickie, but knowing it was their last one for a long time spoiled things a little.

Their mom had overheard the little exchange and wanted to voice her disapproval but also didn't want to spoil the goodbye, so she settled for giving Megan a stern look before hugging her daughter goodbye and heading back inside.

Megan opened up the passenger side door and bent over at the waist, resting her head and chest on the seats. Reaching back, she pulled down her denim shorts to present Mark with her ass like it was a present. Knowing Mark wouldn't turn down a goodbye fuck, she'd prepared a little goodbye surprise for him.

Megan opted to wear something she'd thought Mark would love; it had an opening cut out that exposed her asshole and gave easy access to Mark's favorite hole. A hole that wasn't empty either, she'd plugged herself up the night before with a decently sized buttplug so that Mark wouldn't need to waste time building up to things and could just ram it straight in.

As soon as Megan pulled down her shorts and gave Mark an eyeful of what she was wearing, Mark's cock instantly sprang to life. Megan usually never took the effort to do this kind of stuff before, she usually didn't pay him much attention at all while he was taking her ass, so the change was new and exciting for Mark.

The buttplug inside Meg had a handle for a finger on the end of it, so Mark did the obvious thing and gently pulled it out. It tugged along the walls of Meg's asshole as it came out, her muscles gripping it tightly, refusing to let it go. When it finally pulled free it left Meg's hole gaping open slightly, open enough that Mark knew he could put it in without taking it slow. Mark had expected something small, maybe a golfball sized thing but what came out was surprisingly large, as thick as he was and only a couple inches shorter.

Putting the plug aside, Mark aimed his prick at Meg's asshole and pressed forward. He slid in easily down to the base, her ass swallowing him like it was the most natural thing in the world and feeling like liquid velvet. Every inch and stroke he gave her felt incredible, but despite how good she felt, how amazing it was she prepared herself for him, it only highlighted what he would be missing when she left. Mark struggled to forget the fact but it was a losing battle that sapped the enthusiasm from him.

Megan noticing Mark wasn't being his usual energetic self when he was inside her butt knew exactly what was bothering him. Not wanting their last moment to have a cloud over it, she tried one last trick to cheer him up. "Hey, I've got an idea, how about you put that plug in my mouth? How's that sound?"

Megan knew it had the right affect before Mark could open his mouth, she felt his cock twitch suddenly as she offered herself up for more demeaning. She obviously didn't feel that way about ass to mouth, nor did most people, but knew her brother did and that's why he liked it, even if he'd never admit it. It was a weird opinion to have but he was young and she was happy to indulge him.

Vivifying at the suggestion, Mark grabbed the plug and moved it towards Meg's face but stopped suddenly. Thinking better of it, he pulled out and returned the plug into her asshole, rapidly plunging it in and pulling it out several times first.

Megan chuffs and rolls her eyes at the treatment, thinking the plug had already been up her ass all night, a few extra dips in won't change anything, boys were so silly.

After roughly dunking the plug into her asshole as quickly as he could piston his arms for a minute, Mark pulled it out finally and brought it to Meg's lips, fresh out of her asshole. Unlike Mark, it wasn't a big deal to Meg, she didn't hesitate a moment before opening up and greeting it with her tongue, even loudly sucking on it for Mark's benefit. She sucked the plug into her mouth and swirled her tongue all over it, treating it like a lollypop and making sure Mark saw.

The effect was almost immediate, Mark was back to his old self and rutting her like a maniac once again. Megan kept her head craned to the side and watched Mark as she continued sucking on the buttplug, knowing what it did for him.

A while later Mark flipped Megan around so he could swap holes. Mark grabbed Megan's head and pressed it down on his cock, forcing it into the back of her throat. She managed to keep it together for the most part but once she felt his pubic hair tickle her nose, she couldn't help but gag on his meat. She sighed internally at still being so inexperienced when it came to deepthroating, only just then remembering to stick out her tongue to lick the underside of Marks cock and balls.

As Mark threw her head back and forth on his cock, making a mess of her face, Megan thought to herself she didn't understand why Mark had such a thing for ass to mouth. He always got like this, so much more handsy after doing it. She couldn't complain though, it was different but nice to be with a guy who actually got worked up about sex, it felt good to be actually be wanted so badly rather than casually used. She found it really cute and endearing the way her baby brother got so worked up with her. But on the other hand, Megan realized it would be disappointing the day he finally grew up and figured out doing ass to mouth with her wasn't such a big deal and started treating it normally like all like everyone else.

Megan realized she'd grown to like how taboo it was being with someone that the Free Use Act hadn't jaded yet. Taking her ass meant nothing to most people but to her little brother and his friends, it meant the world. She liked how much more into they were than any other guy she'd been with. The dirty thought of making it a habit crossed Megan's mind and she really considered it. The idea of being the first ass guys got to dump a load in excited Megan in a way that she hadn't felt in years. Megan resolved to consent to any guy that the Act didn't cover yet that tried his luck with her.

Mark swapped holes several more times over the next half hour before eventually powerfully spraying his cum deep into Meg's well used ass. Megan felt Mark tense and clutch at her. She felt his cock pulse inside her followed by spurts of warm cum that made her feel even fuller. Megan oddly enjoyed it, even if Mark did dig his fingers into her hips painfully to pull her into her, she liked how desperate he was to bury himself inside her when he was cumming. Megan kept up the rhythmic clenching and unclenching motion she always did to drain the last of the cum out of her brothers cock as he partially collapsed and onto her back, totally spent.

Megan felt his cum slosh wetly inside her, arousing her unusually. Ever since that day at the beach, she had a harder and harder time ignoring Mark while he got off in her ass. It was like Mark's naivete was rubbing off on her. She had to fight to stop herself from moaning or wrapping her arms or legs around him sometimes, not wanting to give him the satisfaction of knowing she did actually enjoy it. She knew he'd just tease her endlessly over it, as if he was the one doing her the favor.

As Mark wetly plopped out of her, Megan arched her ass up higher to keep anything from spilling out before quickly grabbing the buttplug and sealing his cum up inside her. He might have thought she did it for his benefit, but truthfully Megan got her own kick out of it too. With that taken care of, Megan turned around again to suck Mark off one last time.

Staring up at him with her big, pretty doe eyes and a mouth filled with cock that had just come out of her ass, Mark thought his sister never looked prettier than she did right then. "I'm gonna miss you so much sis."

With her mouth full, Megan couldn't reply but managed a smile in return.

~~~

Megan had spent the rest of the day driving to meet up with a few uni friends before they all flew out. When it got too late to drive, she stopped at a hotel for the night and decided to give her mom and Mark a video call.

Mark was quick to answer and showed up on her screen smiling brightly immediately. He was so much like a puppy Megan thought.

"I miss you already," Mark said.

"Well then go to your friends places, I did work out that deal for you remember?"

"I miss you though," Mark emphasized.

Megan chuffed and couldn't help but smile. "I miss you too loser." The two chatted for a while before eventually saying goodbye. Though right before they did end the call, Megan had one last surprise for her brother.

Megan brought into frame a shotglass. "What's that for?" Mark asked curiously.

"This, is for that creampie you gave me this morning. Just a little something to tide you over." The look on Mark's face alone was almost worth it Megan thought.

Setting her phone down somewhere stable, Megan backed up and turned around. Bending over at the waist seductively, Megan pulled down her shorts revealing the familiar panties and buttplug she'd worn earlier that day. She'd kept the buttplug in all day, letting Mark's cum soak into her.

Grabbing the shotglass she'd prepared, she placed the rim of it against her asshole as she pulled the plug out. Immediately the creamy white fluid that Mark had dumped in her ass poured out and filled the shot almost half way before it finally stopped. Turning back to the camera and getting real close up to it, Megan gave it a wink before she opened her mouth and slowly upended the Mark's milky white load onto her tongue, letting it slide to the back of her throat. When her treat stopped flowing, Megan stuck her tongue into the shotglass and lapped up what was left inside before tilting her head back and opening her mouth wide to give Mark a good look. She gargled the lurid concoction for a moment, playing up the filthiness of the act for Mark before she closed her mouth and gulped it down loudly.

From the reaction earlier that day, Megan knew that while Marked loved going from her ass to her mouth, watching her eat the anal creampie he gave her was on a whole other level. It was no different this time; Mark looked completely hypnotized as he watched Megan. It made her feel wanted in a way she seldom felt and she loved every second of it.

Mark was still pretty young and inexperienced so to him it must've seemed like the most extreme thing you could do for someone. But to Megan, it meant as little as a handjob or even hug, she just couldn't be bothered doing it for Mark most of the time. These days those feelings were changing though as she came to love her little brothers exaggerated naïve reactions. She resolved to enjoy it while she could and do it for him more often while he still felt this way about it.

With her show finished, Mark groaned half miserably, half in desire. Megan raised a brow. "Not quite the reaction I was imagining. You didn't like that?"

"I did, I did," Mark quickly blurted. "It's just... Look." Mark aimed his phone at his pants, showing Megan the massive tent erected there. "Mom's still mad at me for spending all that time buttfucking you so she's not letting me use her throat again. This thing is going to kill me Meg, really it is, I'm going to die from low blood pressure or something."

Megan laughed lightly. "Try talking to your friends and see if any of them have made any headway."

Mark hummed, he didn't think his friends had had enough time to convince their moms yet but it was worth trying he supposed. "Yeah I guess I could try that, it's better than dying a slow tumescence related death."

"Well you have fun and try not to forget me, love ya loser."

"I'd never. Love you Meg. Missing you heaps, bye."

Hanging up the phone, Mark started texting all his mates to see if they'd made any progress.