A less serious sibling moment.

As Viv's thumbs tapped away, Mason gave her a dirty look. This was typical. Having a sister like her basically meant that he was stuck in an unending cold war. And somehow she always, always, had the upper hand. Catching him when he broke a rule and blackmailing him was new (Viv was the rebel not him.) But however it happened, the swarthy woman always got the better of him.

But that was only half of it. The real kicker was that Mason could never really get the sweet vengeance he craved. Oh, he could always try to prank her back or try and get her into trouble. But Viv was always ready to retaliate and had no problems going nuclear to prove a point. Like when he was twelve and got her in trouble for cheating on a quiz. She ended up gluing him to a chair. Resulting in a very awkward wait, while his mom brought him a spare pair of pants.

But now things were different. Or rather things had the potential to be different. After all, Viv had no idea about Luxuria. If Mason used it on her she'd never be able to trace whatever happened back to him. It was a perfect plan.

Well, it was an almost perfect plan. The only real problem was that if he used a magic app created by the archdemon of lust herself to mess with his sister things could get very awkward very fast. But he wouldn't let that stop him. The power to manipulate reality was in his hands. There was just no way he could pass using that up. He would just have to try and keep the weirdness to a minimum.

So Mason unlocked his phone to check Luxuria. The first thing he saw was two new messages.

You told your big sis that you got some! You earned 15 silver for Viviana Villanueva!

Uh, oh! Viviana Villanueva blackmailed you! Well here's a consolation prize! You earned 8 silver for Viviana Villanueva!

He closed those messages and tapped Viv's name (doing his best to ignore as her giggling, chibi avatar gave him the finger.) With those last two rewards, Mason had 4,184 silver to spend. It was actually the second most coinage he had on any target. Only Yumi had more. Surely he could do something with that.

His first thought was the obvious one. The Info tab wouldn't have much he didn't already know. But the Secrets, by definition, would. Unfortunately, he ran into a solid roadblock. There were plenty of secrets listed. Eight of them, in fact. But the absolutely cheapest one was over ten thousand silver. It took him a lifetime of friendship, and a passionate night of lovemaking, to get Yumi that much silver. And that one was just the "cheap" one. The others ranged from 15,000 all the way to a ludicrous 45,000.

Well, that immediately shot down his plan. At first, Mason just wanted to balance the scales. Find some dirt on his big sister and use mutually assured destruction to get out of yoga class. But that wasn't going to work. The problem was that a sibling rivalry was still a rivalry. And you didn't share secrets with your rivals. So he would either need to earn a lot of silver, get Viv to trust him more, or both. And there was just no way he'd get that done by Thursday.

So he'd have to change strategies. Pretending to adjust his glasses he glanced across the table at his sister. Her brown eyes stared disinterestedly down eyes as she sipped her coffee. Viv hardly even seemed to acknowledge him.

So with his heart wildly hammering in his chest, he switched over to the Kinks menu. Logically this was the next best thing. After all, there was a chance that she had some bizarre fetish she would desperately want to keep under wraps. It wouldn't be as easy or clean as an actual secret, but it could still work.

Once again the menu listed two unknown kinks. Mason wasn't sure why more weren't listed. It seemed like there should be more turn-ons per person. For him, it felt like he got a new kink every time he watched some porn. His best guess was it had something to do with how hot the specific kink got someone. If it crossed a certain point then Lilith gave them the right trait. But that was a question for later. After all, time was working against him. It was already Tuesday.

Thankfully it seemed Viv was a lot more comfortable with her desires than his bashful girlfriend. Her traits only cost 200 and 350 silver apiece. So deciding that if he was in for a penny he might as well be on for a pound he decided to unlock both.

So with bated breath and sweaty palms, he unlocked both. And, ignoring his fraternal instincts, **** himself to read them.

King (Or Queen) Of The Hill: Rank 1! Viv is a bit switchy but in an odd way. She wants her partner to try and dominate her, while she does the same. She wins either way, but the struggle is important.

Everything Butt: Rank 1! There's just something about asses that gets Viv going! Whether it's anal sex or just looking at a hot butt. So she's more willing to try butt stuff of all kinds, and is more likely to enjoy it too!

Mason looked away from the phone and spotted his reflection in the window. If he didn't know better would worry that he was having a heat stroke. He had never blushed this hard. Even last night was a distant second.

But he calmed himself down, breathing in for a count of seven and out for a count of nine. This was a time for logic and reason. If he was **** to work with kinks then this was the sort of thing he might have to deal with. And even if he never wanted to know either of those things about his sister, he knew them now.

He just wished he learned something more useful. There was no question that Viv wouldn't want either of those traits to become public knowledge. Especially the butt one. But Mason couldn't really make use of either of those (Well a particularly twisted and lecherous part of his mind offered several ways to take advantage of both of those traits, but he firmly ignored it.)

Neither of those fetishes was the type to leave much in the way of evidence. And once his spitfire sister realized he was threatening her with an empty hand (which she definitely would), then she would come down on her idiotic, little brother like an avenging angel strapped to a ton of vindictive bricks.

And that would be bad. He liked having three dimensions.

But he did still have 3,634 silver, so there was still hope. Plus there was one advantage kinks had over secrets. He could buy boxes for more kinks.

So he decided to go ahead and buy a large box. After all, silver didn't do much for him if he didn't spend it. Mason crossed his thick fingers and hoped for something good.

Wincest: Rank 1! Viviana loves her family. But not in a strictly familial way. Or to be blunt about it she finds her family hot and fantasizes about committing one of the ultimate taboos.

Once again he suspected these traits were not nearly as random as Lilith pretended.

This was certainly a tricky one. And Mason was genuinely unsure if he even wanted to turn this one on.

Things were already weird as they were. And he didn't really want to have to think about his big sister secretly having the hots for him every time they were in the same room. But even discounting that, he wasn't sure he wanted to be on the receiving end of Viv's womanly affections. He remembered Adam Kneller, his sister's crush in fifth grade. Or rather he remembered the jar of caterpillars she dumped on his head in lieu of a valentine. And while the Latina woman had grown up a lot since then, her senior year boyfriend still ended up duct-taped to the cafeteria wall (admittedly that was after she found out he was cheating on her, but still.)

On the other hand, this did have the potential to be really funny. After all, the app said that she would be attracted to her family. That meant Viv, who had never felt the need to hide her bisexuality, would also become attracted to their moms too. And seeing his cocky sister grow increasingly frustrated as she lived with three people she wanted, but couldn't have, had a lot of potential. Maybe it was just a little sibling thing, but finally getting the chance to drive her as crazy as she drove him would be some sweet vengeance.

And at the end of the day, this trait wouldn't actually change anything. After all, it would take a lot more than just a little attraction to get Viv to start seducing her family. And if things ever got truly out of hand he could always turn the trait back off.

Ultimately the sunk cost fallacy carried the day. So Mason decided that if he spent the silver he might as well turn on the trait. For now.

And as his infernal patron explained there was only one toggle for kinks. Mason wasn't sure how much it would actually matter. So, deciding it would probably be a little more frustrating for his sister if she realized this was a new problem, he just set it to on.

But that wouldn't help much either. In fact, based on his own experiences it might make Viv more eager to spend time with him. So Mason it was time for a Hail Mary. He switched menus again. Something told him that the behavior boxes wouldn't be any more helpful. But maybe it could help make his sister a little nicer. So he bought another large box and (not expecting much) read the unfurled scroll on his screen.

Just A Prank Bro: Rank 1! Viv is, let's say, a playful gal. But with this trait, her pranks will have a distinctly lewd edge to them. Hope this isn't too hard on you!

That wasn't what he needed, but it also wasn't that far off from what he had expected. It seemed Luxuria really couldn't help him here. So instead he debated about turning the trait on. This time though it didn't take him long to say yes.

After all, Viv would continue to keep pranking him either way. Like last week when the fit girl decided to leave a glob of marshmallow fluff under his pillow. But maybe "lewd" pranks would be a bit less annoying. Even if he was now more than a little worried about what he'd find under his pillow instead.

It also didn't take him long to figure out the toggles. Forcing Viv into a stream of erotic pranks would probably make her incestuous desires even more frustrating. But only if she knew what she was doing. But if his Latina sister got caught she would end up asshole-deep in a lot of very real trouble. Which would definitely cross the line from mischievous to cruel. So he decided to keep everyone else in the dark.

But that was enough of that. He locked his phone and set it down. It was a wise man that knew when he was beaten. And if he spent any longer messing with the app his cereal would officially hit the gross, soggy, point of no return. So he started shoveling the slightly mushy oats into his mouth before it was too late.

After a few more minutes Mason's bowl and Viv's mug were both empty. That meant it was apparently time for his sister to head out. With practiced ease, she pulled a hair tie off her wrist and secured her shoulder-length hair in a high ponytail.

"Alright," She said, stretching a little as she got her water bottle out of the fridge. "I'm out. Good luck llorón."

"Yeah, yeah," Mason said grouchily. Then he groaned in irritation when he realized she left her mess for him to clean up. And of course, when he turned back to call her out on that she was already gone. At least it wasn't much work. The dishwasher was still mostly empty, so finding room for a bowl and a mug was child's play. No Tetris-like arrangement necessary. But as he went to drop the wrapper from her breakfast bar into the trash she reappeared behind him.

"Oh, and one more thing baby brother," Viv said playfully. "A little 'I told you so' task."

With a heavy sigh, Mason turned to face his doom.

"What n-!"

Mason was ready to give her a piece of his mind. But what he saw completely stopped him in his tracks.

There was his sister Viv. And there was his sister Viv's ass. Her bare ass. Her tiny, red shorts and plain black panties were bunched around her thighs, just below the bottom of her cheeks.

"Kiss my ass!" The Latina girl said, looking back over her shoulder and sticking her tongue out at him.

Mason wanted to say something. But he couldn't. He wanted to look away. But he couldn't. He wanted to stay flaccid. But he couldn't.

Years of exercise had sculpted Viv's ass into a work of art. Each glute was a firm, perky, curvy masterpiece. But that much was obvious whenever she wore yoga pants. But seeing it bare revealed so many little details that made the sight even sexier. The biggest one was the inverted triangle of slightly paler skin her bikini left behind. It really accentuated her curves.

And when the athletic girl bent forward and gave it a little shake, it was all Mason could do to not groan like a pervert. Especially when he caught a glimpse of the tight, little hole between her cheeks. Doubly so when he remembered that she actually liked using said hole.

"¿Qué chingados?" He said weakly.

And just like that, it was over. Viv pulled her pants back up and made a quick getaway. Running out the front door and cackling like a hyena that dabbled in witchcraft. And leaving a thoroughly dumbfounded brother in her wake.

For a full minute, all Mason could do was blankly stare at the spot where his sister had been standing. His brain felt like it was full of static, completely unable to make heads or tails of what just happened. But eventually, something clicked and he realized what just happened. Well, obviously his big sister just flashed him her ass. But that wasn't exactly what happened from her perspective. To her, Viv had mooned him. Then ran away before he had the chance to get mad.

But the giant nerd wasn't mad. Not unless it was a hate boner trying to rip a hole in his pants. He glanced down at his phone, still sitting on the kitchen table. He may have gone a bit too far. Or maybe not. There were a lot of conflicting thoughts wrestling for his attention in his mind after that.