Issei's Lusty Introduction to Life as a Devil: Chapter 4 - Curiosity Awakens The Degenerate

Rias cursed herself for what felt like the hundredth time that day.

'What am I doing?!' she raged internally. This wasn't her, hiding outside her brother's room like a pervert to spy on him, but her insatiable curiosity had gotten the better of her.

Rias was a pretty observant young woman. She was proud of her intellect and her ability to read the people around her like an open book. She was also gifted in spotting patterns where others merely saw scribbles. One such deductive insight was noticing that her brother always sent his house's staff away on the same day, once a month.

'The thirteenth. On the thirteenth of every month everyone from the cook to the groundskeeper gets the day off,' she mused, feeling ridiculous as she peered around the large potted plant on her brother's huge balcony to spy him through the wall of glass separating the ostentatious master bedroom from the elements.

Sirzechs was still and regal, like the many statues that had been carved in his image, as he read through documents while relaxing by his huge marble fireplace. His other hand pressed the cool glass of iced scotch against his temple, no doubt to assuage the headache whatever he was reading was bringing on.

Rias was dying to know why this specific day as she observed him, as if trying to glean the answer from something visible on his person. Her curiosity got the better of her and while simply asking her brother might yield the answers she so desired, her pride wouldn't allow it. Her brother and sister-in-law were clearly trying to hide something from their staff, and she wanted nothing more than to solve that mystery.

Unfortunately, discreet inquiries towards Sirzechs' help yielded no useful answers.

'It's just the way it's always been,' they said with careless shrugs, and why would anyone have any incentive to question any extra free time off?

The nonchalance wanted to make Rias pull her hair out in frustration.

'How are none of them even a little curious?!'

So that's how she found herself in this strange predicament. She'd commissioned a powerful invisibility potion from an alchemist that lasted for twelve hours and, while donned in a warm coat to protect her from the evening chill, hid herself behind one of the exotic plants - with pots larger than her - decorating his balcony.

She'd considered hiding in their spacious shared closet, but quickly squashed that foolish, and cliched idea.

For one, the view from the slatted doors wouldn't come close to the unrestricted picture she had now through the floor to ceiling windows that normally offered a stunning view of the mountains surrounding Sirzechs' property. For two, the invisibility potion wasn't infallible. While their closet was large, it would be hard to avoid bumping into either Sirzechs or Grayfia if they needed to change or access their equally large bathroom.

She was ripped out of her musings rather suddenly at the shocking sight of Grayfia storming out of the closet and making her way towards a startled yet stupidly grinning Sirzechs.

'I don't blame him,' Rias thought with a not insignificant amount of envy.

Grayfia Lucifuge was an unparalleled beauty, even amongst the absurd standards set by the supernaturally beautiful women that seemed to be the norm in the Underworld. This was true even with her ridiculous adherence to her self-imposed dresscode of a modest French maid-like outfit.

'The outfit only barely accentuates her huge boobs. Everything else is boring, not like a real sexy French maid outfit at all!'

Said outfit was nowhere in sight.

Instead she had confidently stormed into the room dressed in only the sexiest set of lace black lingerie Rias had ever seen. The stunning beauty now had her back to Rias as she stood before her husband, in either hand a different slinky dress she no doubt asked his opinion on as she held each over her voluptuous body.

Rias sighed. She hoped her body would mature into one as exquisite as her sister-in-law's. She was particularly jealous of her large breasts and wide hips.

'At least my boobs are starting to grow nicely…' she mused with a pout as she felt up her own modest chest.

Sirzechs motioned to the red one and, to Rias' surprise, Grayfia scoffed and disappeared it with a nimbus of purple magical energy. She then began to slip into the incredibly slinky, black cocktail dress.

She turned so her husband could eye her derriere as she slipped into the dress. Rias was surprised with how both slutty yet classy the dress was. From the front it looked undeniably classy, long sleeved with see-through lace covering her arms and immense cleavage. The dress was almost entirely backless though, necessitating the removal of her bra, and finished so low that her lace thong was still visible.

Rias blushed furiously when Grayfia remedied that problem by removing her panties too.

If her entire naked back being exposed along with the slightest hint of butt cleavage wasn't quite slutty enough to earn the title, the dress being short enough that it barely covered Grayfia's plump ass cheeks certainly pushed it over the edge.

Rias was sure if she bent over even a little, everything would be exposed.

'She's certainly never dressed like that around us before, but is this it? Grayfia is slutting up for some kind of date night? How… boring,' Rias mused as she spied on her sister-in-law readying herself.

With her dress on and strappy heels in hand, she gave Sirzechs a cool once over. They stared into each other's eyes until after several moments, to Rias' surprise, Sirzechs bowed his head and nodded.

Grayfia made her way back into her closet, no doubt to finish getting ready, but nothing prepared her for what Sirzechs did next. To Rias' horror, her brother started to strip. He was only in a shirt and slacks, so it didn't take too long, but Rias sat transfixed as she watched her beloved brother disrobe, not quite understanding why and too shocked to look away.

Instead of following his wife into the bathroom, Sirzechs once again took his seat in the puffy armchair by the fire. He sat hunched with his palms on his knees and his eyes locked on the fluffy rug below. It was a very subservient pose. Rias would have been shocked by such a pose if she wasn't transfixed by the sight of his erect member, the first she'd ever seen in real life. It was hard, and throbbing, and looked huge to her eyes. Slightly longer than a can of soda, and about half as thick.

She was ashamed by her curiosity and for not immediately looking away from her brother's genitalia, but was rescued when Grayfia strolled back into the room with a nod of approval. She'd obviously used magic to quickly finish getting ready, her long silver hair styled immaculately in a braid she slung over her shoulder, leaving her exposed back bare, and with only a faint touch of make-up and some shiny lipstick to accentuate her already stunning beauty.

Sirzechs stood like an eager puppy as she approached, but Grayfia only scoffed and gently shoved him in the chest so he fell back into his armchair. As he got comfortable again, Rias' face flushed crimson as Grayfia circled her husband and reached over to cup his member from behind, She then began to stroke the entire length of his throbbing member, her position giving Rias an unrestricted view.

Her eyes widened however when magic started to form around her hand and her brother gasped and shivered - in pain or pleasure, it wasn't clear. It was hard to tell from her position, but it looked like Grayfia's hand was coated in a frosty aura of expertly controlled magic.

While she couldn't say for certain what Grayfia was doing, the effect was obvious. His penis quickly began to shrink from its previously throbbing state. Where once stood a proud, erect member was now a sad, shrivelled little appendage the size of Rias' thumb.

Rias found the sight so fascinating that she didn't even care that the dick belonged to her brother anymore.

'They can grow and shrink that much?!'

Grayfia then showed her mastery and control over magic as she brought her other hand up to join the first, momentarily covering her brother's shrivelled appendage. Whatever she was doing either caused her brother a decent amount of pleasure or pain, because he bolted upright and began to writhe against his wife's embrace.

She thought he might have leapt to his feet but Grayfia's arms around his shoulders and in his groin kept him securely in place.

She was a very strong Queen, after all. The strongest, some might say.

'And it's not like he's resisting all that much…'

Rias gasped when Grayfia removed her hands from Sirzechs' crotch, revealing what she'd done. Rias idly thanked her foresight in choosing to hide outside when she realized how loud that gasp was.

When Grayfia removed her hands, Rias was stumped, unsure what exactly she was seeing, though still shocked by it all the same. It looked like Sirzechs' forcefully shrivelled penis had been encased in a translucent cage made entirely of ice.

She assumed it was to keep his penis from growing again, but Rias didn't understand why.

There was a lot about what was happening that Rias' virginal mind didn't understand.

His penis now seemingly restrained, Grayfia summoned two sets of manacles with a wave of her hand. The obsidian chains flew from the closet like a rocket into her waiting hand and Rias watched in shock as Sirzechs' eyes widened in excitement.

'He's enjoying this! It's clear by the look in his eyes!'

Lust is an emotion any self-respecting Devil would recognize anywhere.

Rias watched in morbid fascination as Grayfia secured the no-doubt magically strengthened bindings to her brother's neck, wrists and ankles, binding him to the armchair completely and leaving him helpless.

'I guess this might be reason enough to send the help away. Can't have regular folk stumbling upon their ruler in this state…'

Rias would have been concerned, but the manacles looked padded and Sirzechs, while his wrists were secured behind him and his legs forced wide, didn't look uncomfortable.

In fact, the look he gave to his wife, who was standing over him imperiously while admiring her handiwork, wasn't one filled with anger or resentment. It was one filled with subservience and adoration.

It was with that look in her brother's eyes, and with the way Grayfia looked down upon one of the most powerful beings in existence that something within Rias changed.

While still thoroughly confused with what was happening, she felt a familiar and powerful sensation of desire and greed boil up in her adolescent devil body.

She wanted what Grayfia had. Not with her brother, obviously, but she wanted it like she never wanted anything before. Rias had never felt as jealous of someone in her life as she now was of Grayfia, standing tall and confident, completely assured and sexy in her dominance over her husband.

As Sirzechs continued to stare at the love of his life in adoration, Grayfia held a hand to her temple while holding another out before the bound Super Devil. A purple runic array of magical energy spread out from her hand and began to spin slowly as Grayfia worked a complicated spell.

Rias watched in fascination as a sheet of what looked like glass materialized before her bound brother, at head height. The spell wasn't finished and the runic array continued to spin slowly until a picture formed in the glass, a picture of her brother's face.

'Why did she try so hard just to conjure a mirror?' She thought only for her eyes to widen when the picture projected on the glass shifted to one of Grayfia's black purse when the woman turned to grab said item off their huge bed.

The image in the glass shifted again as Grayfia turned to regard her naked and bound husband with a smirk, before waving and making her way to the large double doors of their bedroom without so much as a bye-your-leave.

'She's projecting what she sees onto that piece of glass! But why? She's leaving without him? What's going on?!'

Rias had been desperate to find out just what in the hell her brother and sister-in-law got up to on the thirteenth of every month, but instead of finding answers, she was only getting more and more questions.

Nothing of real consequence happened for about ten minutes. Grayfia was in the backseat of a limo being driven somewhere after having teleported to what she could only assume was the mortal realm.

It wasn't until she got out at what appeared to be an extremely fine restaurant that things started to get… interesting.

A tall man with dark skin and neat, close-cropped hair dressed in a stylish tailored suit greeted Grayfia with a smile and a kiss on the cheek. The man was handsome and, evidenced by the cut of his suit, incredibly well-built. He also had huge diamond studs in his ears and a matching diamond-encrusted watch that looked more expensive than the car Grayfia had arrived in.

Rias gasped in shock when Grayfia looked down, revealing to both voyeurs that she'd entwined her fingers with the man as they held hands - as if they were lovers. Rias watched as the large man led one of the most beautiful, married devils in the Underworld into the classy restaurant.

'She's… going on a date… with someone other than Sirzechs?!'

Rias continued to watch, utterly dumbstruck as the two were escorted within and seated at a table with an incredible view of the other patrons, but Grayfia, and thus both Rias and Sirzechs too, had only eyes for the gentleman across from her.

As her date perused the menu, Grayfia looked up at the art hanging on the wall beside them. It looked exquisite, but Rias only noticed Grayfia running her hand along the lower portion of the frame, as if she were getting a feel for it.

The shift in the glass panel's perspective revealed the true reason. She had altered her vision spell so that instead of projecting a view onto the glass from her eyes, it did so from the position of the picture frame.

'So the spell isn't directly tied to what she sees, it's almost like placing a camera wherever you want. I'll need to get her to teach me how she does it… without somehow revealing how I know she can do it...'

The benal thought seemed totally incongruous given what was happening in her beloved brother's marriage behind the scenes, but she couldn't help it.

Rias was a very curious young woman.

What followed over the next two hours was kind of boring, if Rias was being honest. Especially since the view she had didn't have audio - that she could hear from outside anyway - and most of what was projected was two people talking, laughing and eating dinner together. She could deduce that the duo were having a rather good time given how deeply engrossed they seemed with each other, and how infrequently their eyes left one anothers'.

The attraction each held for the other was as clear as day.

In fact, so little happened over that time Rias debated calling an early end to her little stake-out. Despite the warm coat she wore it was still rather chilly out on the balcony and her butt was getting sore from sitting on the granite tiles.

And she was bored.

Oh so bored.

It was just as she was berating herself for not having the foresight to bring any snacks that things got… even more interesting.

The man slid along the booth until he was sidled up to the beautiful Devil. Grayfia didn't look the least bit annoyed by the invasion of her personal space - as Rias would have expected given Grayfia's normally frigid public persona - in fact she allowed the obviously weaker mortal to sling his long arm around her dainty shoulder and draw her into his chest.

Rias barely noticed her brother thrashing against his bonds as the stranger leaned down and ran his fingers up along her throat gently to direct her delicate lips into his own in a sensual kiss. Grayfia's hands were not idle either, with one disappearing behind his back and the other slipping in between the buttons of his shirt and tracing circles over his no-doubt chiselled chest.

Rias' face flushed at the intimate scene. The couple were in a world of their own, unaware to the passages of time or the staff that infrequently passed their table to top up drinks or to potentially be of use.

Looking at her watch with a frown, Rias was wondering just how long they could possibly be making out for when, after ten minutes of non-stop kidding, the couple pulled apart from each other to reveal a pair of grinning, lust-filled smiles.

Instead of saying anything, the man held up a platinum coloured credit card while keeping his eyes locked on Grayfia. He didn't even blink when a waiter rushed over to take it, nor did he look at the receipt when it was returned with his card.

He stood and motioned towards the door with a wide smile that Grayfia uncharastically mirrored.

'A lot of what I'm seeing tonight seems uncharacteristic of her. I feel like I don't even know her… I thought we were sisters...'

With such morose thoughts swirling in her mind, Sirzechs and she were allowed only a view of their once occupied booth as the couple no-doubt made their way back to Grayfia's ride.

They didn't need to wait long.

The view in the glass panel shifted to one from somewhere in the back of Grayfia's limousine. It was probably near the divider window as it had a perfect view of the handsome stranger, whose large frame looked squished in the back of the luxurious vehicle, as well as Grayfia, who's sinful body slid into position right next to him, so close she was almost sitting in his lap.

'I wouldn't be surprised if that limo has no driver and is operated entirely by Grayfia's magic and will…'

Over the next ten minutes, the voyeurs were treated to the sight of Grayfia and her date sucking face as the limousine drove them who-knows-where. If Rias wasn't so stunningly shocked at Grayfia acting like a horny teenager, she may have spent more time worrying about what this meant for her brother's relationship - she loved both of them, after all.

As it was, the mere implications of what she was witnessing had her stomach feeling queasy in a way she didn't appreciate at all. As if a sense of foreboding was looming over her and making her physically ill… yet aroused at the same time?

She was one very confused young woman.

'It's not like she's doing this without his knowledge though…' Rias mused as she spied her naked, caged and bound brother staring at the screen with such lust and intensity it frightened the younger devil.

Things then got… out of this world.

Rias' face erupted with heat as Grayfia's gaze shifted to her date's lap. He was still clothed, but his fitted slacks did very little to hide the incredible bulge that started from his groin and snaked down his powerfully built thigh obscenely.

Her hand had been tracing circles against his abs, but she then decided to up the ante. As she looked into his lust-filled gaze, her pale hand began to trace the length of the comically large bulge threatening to tear itself out of the flimsy material until, one one of the long journeys back up to the base, she instead diverted to the belt buckle.

'Is she…?'

The voyeurs did not need to wait long for an answer.

With a tug and a yank, the man's belt and zipper were undone, but that wasn't nearly enough to fetch what the obscene bulge suggested lay within. Lifting himself up ever so slightly while unbuttoning his shirt, Grayfia was then able to pull his slacks down until something Rias once thought only existed in her hentai doujin flopped out for them all to see.

The obsidian shaft was so huge, it reached past his belly and almost to his pecs.

'It's as big as a Pringles can!' Rias wanted to shriek out at the impossible cock Grayfia was staring at longingly. If it was possible, Rias thought the obsidian shaft somehow looked angry. Thick, covered in veins and leaking copious amounts of fluid from the tip, this thing was a weapon.

To think, only a few hours ago Rias had seen the first real cock of her life and she'd thought it was big. Looking at her brother, who was thrusting his now tiny, encaged penis like some degenerate at the sight, Rias was distraught.

Her idyllic image of her beloved, indomitable, badass older brother had been shattered in mere moments.

'I still don't understand what's happening here... Is Grayfia punishing him…? But why? And why every month?'

The two went back to making out, instead this time Grayfia had one arm curled around her date's neck while the other heroically performed the arduous task of jacking off the incredibly huge member, coating the obsidian flesh in a sheen of pre-cum.

It didn't take long for Grayfia to escalate things, and Rias was shocked to find herself urging her on in her mind. She wanted to see that cock disappear into one of her sister-in-law's orifices… if for no other reason than to find out if it were even possible.

Remaining on the seat beside her date, instead of slipping onto the floor - to make sure the intended voyeur still had a view, Rias realised - Grayfia leaned over and started placing loving kisses on the head of the monstrous member. Her date's head tilted back in bliss as Grayfia's delicate pink lips started to lavish attention on the colossal appendage.

Sirzechs began to thrash anew, and Rias was shocked to see him even trying to use magic to break his bindings. Nothing worked. The only magic left unused, that would surely work, was the one inherited by his bloodline, and while Rias would never risk using the Power of Destruction so close to her own body, she knew Sirzechs could use it to engrave a ring on his own finger, should he wish it.

Which proved to Rias that he didn't really want to escape his bindings.

'What is going on here?!'

The breathless Rias went back to focusing on her sister-in-law. Her date had one hand threaded in her luxurious platinum locks while the other had slid down her exposed back and into her dress, the ease of access allowing him to run his long fingers along her slit as he got a blowjob from the incredible MILF.

Grayfia's pink lips were stretched obscenely around the thick appendage, focusing more on lavishing attention on the head than fruitlessly trying to get as much of that into her throat as possible. She also played with his equally large balls while going down on him.

Her date was enjoying the attention very much.

Rias also started to realize an uncomfortable tingling in her nethers as she watched the scene. Uncomfortable not in how it made her feel, but what it meant for it to be there.

She was aroused, and that… troubled her as much as it excited her. She was as confused as she'd ever been and she wasn't sure how she was supposed to feel.

She needed her big sister to talk to… but she was currently otherwise occupied.

Speaking of, Rias was startled out of her voyeurism by the quiet hum of an engine pulling up outside her brother's manor. Rushing over to look over the railing, she was shocked to see it was the very limousine she currently had a view inside thanks to Grayfia's magic.

Looking back over to the glass panel, she was shocked to see it had dissolved, leaving an overexcited Sirzechs trashing in desire, but with nothing to see…

'For now…' Rias mused as she spied the sinful couple's vehicle from the balcony. The man got out first, he had made a half-hearted attempt at redressing himself, and by that Rias meant he had simply buttoned up his slacks so he could walk, his enormous shaft still hanging free out of the open zipper, the sheer ridiculousness of the scene made it look like a prop.

Rias knew better.

'I suppose getting it back in his pants was a bit much to ask…'

He then helped his stunning date out of the vehicle. She hadn't lost any of her clothing, but her immaculate hair was frazzled and she had a look of such pure lust on her features that Rias barely recognized her.

When they started for the manor's large doors, Rias quickly shuffled back to her hiding spot. While the invisibility potion made her near untraceable, if she was caught moving, a distortion in the air would be perceptible, quickly giving her away, especially to someone as discerning as her sister-in-law.

She didn't have to wait long for the main stars of the evening's entertainment to arrive. The stranger walked in first, his huge dick hanging unashamedly out of his slacks as he turned and chuckled at her bound brother over by the fireplace. Neither he, nor Sirzechs looked surprised at the appearance of the other, so Rias deduced this whole evening was preplanned...

Grayfia flowed into the room behind her date and looked over at him and her husband with a sultry smile on her face as she began to remove her jewelry.

She couldn't make out words from her hiding position outside, but Rias was amazed that her brother seemed to be having a cordial conversation with the handsome stranger, as absurd as it looked given both of their states of undress and the situation as a whole.

With a lusty smile still firmly in place, Grayfia strolled over to the conversing duo before leaning over and placing a chaste kiss on her husband's head, as if he were a beloved pet. She then got on her knees beside them and grasped both their members. She held Sirzechs' caged cock with her thumb and index finger while she held her date's as if it were an anaconda, ready to strike.

She was speaking, but Rias couldn't hear. Whatever she said though had her brother flushing in embarrassment however as she waggled her date's huge cock in his face. Rias almost screamed when Grayfia slapped her brother using the huge cock, but managed to contain herself as her brother looked down in shame and nodded.

Grayfia laughed at whatever was said and got back up to drag her lover by the cock towards her marital bed. She released his appendage and began to undress him, worshipping his chiselled body as each piece of it became uncovered. She first removed his dress shoes and socks, then his shirt and finally his slacks and underwear. With each bit of skin revealed, Rias understood more and more why Grayfia found her date so attractive.

He looked like a sex god that had been chiselled out of obsidian, and Grayfia made sure to pay respects to each inch of flesh revealed by kissing or tracing her tongue over it.

When he was finally naked and standing there in all his glory, Grayfia pushed him onto the bed. He lifted himself and rested on his elbows, his cock still hard and flat against his chiseled abs so he could watch Grayfia disrobe.

And disrobe she did. It didn't take long, her dress was a tiny thing she shucked in a few seconds, but her date had been waiting all evening to see what she had been teasing him with her choice of clothing.

Rias once again felt a bang of envy at the sight of her sister-in-law's body. The body of a true woman, backed by power and lust she was everything Rias wished she could be.

It seemed Grayfia and her lover were very much done with foreplay, however, because they quickly got into it. She followed her lover onto the bed, her juicy behind facing her husband, as she positioned her lover's huge cock at the entrance of her eager, gushing pussy.

While Rias didn't have a front-row seat to the penetration like her brother did, she could tell easily when it happened as Grayfia's head leaned back and moaned her pleasure to the ceiling.

Rias did have an excellent profile view though, a view she was ashamed to admit she found incredibly titillating. She watched as Grayfia placed her hands on her lover's pecs and rode him to her heart's content. As embarrassing as the situation was, Rias also made sure to take notes of exactly how Grayfia was riding the huge member for her own personal use.

It's not often one gets real life first-hand lessons in such a thing, after all…

'Huh. So it's not just about lifting and dropping, she seems to be swirling her hips just as much… she's also not taking the whole thing in. I've always wondered about that…'

Grayfia made sure to occasionally look over her shoulder to smile or wink at her husband, but mostly she remained focused on extracting as much pleasure from her lover as possible.

They switched it up a bit soon after. With Grayfia instead riding her lover reverse cowgirl so she could keep her eyes locked on her husband as another man took her in front of him. Rias assumed Grayfia really liked this position, because it seemed like she came several times while being fucked in it, though it was difficult to tell because he did not slow when she did, only continuing with his steady fucking of the gorgeous MILF.

Grayfia was now on her knees, allowing her partner to thrust up into her as she kept her legs spread for him. She held her huge tits firmly in her grasp as she squeezed and pulled on them while she was being drilled into.

'This is so much better than doujin,' Rias thought with an embarrassed blush and a quiet, giddy giggle. 'I think I finally understand why so many people like NTR…'

Her lover then started to take more control. He bucked his hips in a way that caused Grayfia to fall forwards, then he got up with his cock still buried in Grayfia's pussy and began to fuck her doggy-style while Grayfia's eyes were still locked on her husband's.

Rias' profile view allowed an excellent angle of Grayfia's pendulous tits flopping around with the constant forwards and backwards motions of their rutting. It also afforded her a better view of just how much of the huge cock she could take in her snug pussy.

'Not as much as I would have thought…'

They fucked like this for several minutes until, with a roar Rias heard clearly through the thick glass barrier, the stranger released in Grayfia's needy pussy. As he continued to unload in her, he leaned over and turned his lover's head so they could kiss as his body shook with pleasurable convulsions.

When his orgasm subsided, they pulled apart and smiled at each other like horny, love-drunk teens. Grayfia asked him something, and she received a bark of laughter in response. Satisfied, she got off the bed and walked over to her husband who had an excited look on his face, Rias paid it no mind however, instead focusing on the thick rivulet of white liquid that flowed down her sister-in-law's thigh.

If Sirzechs had assumed Grayfia was ready to release him, he was sadly mistaken. Instead, Grayfia lifted her leg and rested it on the armrest of the chair and leaned forward while spreading her pussy lips. The rivulet became a flood before Rias' eyes as a torrent of cum splurged out of Grayfia's well-fucked pussy and landed on Sirzechs' naked thigh.

Rias tried to ignore the disgusted wince on her brother's face as it did so and instead focused on the giant of a man approaching her sister-in-law from behind, his huge member hardening again as he stroked it into readiness.

Grayfia moaned in approval as he stuck it in her again, the force of the penetration causing her to fall forward and smother her husband with her large tits.

He fucked her in that position at a much slower pace for the next half hour. As long as this next session took, Rias couldn't look away from the scene. This time it seemed like Sirzechs and Grayfia were in their own little world, kissing and whispering sweet nothings to each other as another man fucked her like a machine.

The look of pure love on their faces was unmistakable as they relished in their dirty little game and Rias, while not understanding the specifics on what the hell was going on, finally understood why her beloved brother and sister-in-law sent the help away once a month.

It was so they could indulge in their unconventional fantasies in peace, without distraction or worrying someone would reveal what they'd overhead to the entire Underworld.

Grayfia's lover left not long after that with a longing kiss and some parted words. She heard when Grayfia's magicked limousine sped away, but only had eyes for the husband and wife within.

She had to look away at one point, not willing to watch her brother eating the remnants of Grayfia's love making from her freshly fucked pussy, which proved to be an almost critical error as she wasn't prepared when the door to the balcony slid open.

A still naked Grayfia stepped onto the balcony and leaned over the rail with a satisfied sigh as the chill wind cooled her hot, naked skin. Rias finally had a close-up view of her sister-in-law's red and abused pussy and she blushed in mortification.

'Can you please untie me, my love?' She heard Sirzechs' voice call out from the bedroom.

'It's still five minutes until midnight,' Grayfia called back, uncaring. 'You can sit and wait like a good little cucky.'

Sirzechs didn't respond with words, but the strange term seemed to inflame his passions as he groaned with arousal.

Rias didn't move. She hardly dared breathe 'less she was spotted. The rapid beating of her heart sounded like an army of elephants stampeding in her ears, despite that, she remained still.

'I can't wait to watch you clean all this mess up in your sexy little outfit, my maid,' Sirzechs called out with amusement in his voice from his still bound position.

Grayfia snorted in amusement as the five minutes were almost up. 'I think we need to start making our little games bimonthly, You're starting to get a little full of yourself.'

'Or maybe you can just invite a second manwhore on your dates, hm?' Sirzechs shot back in a jovial tone, and though he may still be bound, Rias was baffled with how in control he seemed to be of the entire situation.

Grayfia's sultry smile returned at the counter-offer and she turned back towards her husband, her elbows resting on the railing as her huge tits stuck out proudly while also surrendering to gravity. 'Your slutty wife is intrigued by your proposal, dear husband.'

'Well then release me at once, you filthy maid. And attend to me.'

When the glass door slid shut again, Rias was quick to leap over the railing and fly down to the ground floor, as if she were a jackrabbit who had the good fortune to be able to escape from the lion's den unharmed.

When she was out of sight of the balcony window, she teleported back to her bedroom, her heart thundering in her chest and her senses going haywire.

She found it incredibly difficult to get to sleep that night, her busy mind abuzz with fantasies filled with boyfriends who got off on watching her have sex with a harem statuesque sex gods.

Rias sat at her desk flying through her math homework when she was interrupted by her best friend.

'A parcel came for you, Rias,' Akeno announced as she placed the rectangular box covered in bubble wrap secured by orange tape with the words 'Fragile' written on it, She also poured Rias a cup of tea as the curious red-head took out a knife and made quick work of the wrappings.

'This is strange, the only orders I've placed are for figurines… none of which would fit in this box…'

When she opened the box she was perplexed to find a mirror. A mirror with a beautiful silver frame adorned with a thumbnail-sized ruby at the centre of the top rail, but a simple mirror nonetheless.

Seeing there was a card attached, she opened it and her heart stopped dead in her chest when she read the words.

I can't imagine the balcony was very comfortable.

Pour a tiny amount of magic into the ruby and enjoy.

We should talk.

Regards,

Your Loving Sister.

P.S. I won't tell your brother if you don't.

With cheeks aflame in mortification, she did as instructed as she looked at her reflection in the mirror. Her normally pale face, now as crimson as her hair, shifted to instead show a view of her brother's bedroom from a spot atop the fireplace.

A much better view than she had last time, if she were being honest.

'What is it?' Akeno asked with a raised brow. 'You look like the time Sairaorg walked in on us in the baths…'

'It's a mirror,' Rias responded, thinking quickly. 'From Grayfia, she was just saying how beautiful I'm becoming. It's embarrassing…'

'High praise from the most beautiful woman in the Underworld,' Akeno surmised as she spied the once again regular mirror Rias flashed her. 'While she's feared by the old generation, every girl in ours wants to be just like her.'

Rias smiled longingly as she ran her fingers along the beautiful frame. 'Yeah… I suppose we do.'

There were several moments of silence after her quiet proclamation before Akeno broke it.

'You're weird.'

Rias laughed.