The air in the living room hung heavy with the musky tang of sweat and raw sex, the low kotatsu table groaning under the relentless rhythm of their rocking bodies.
Obāchan's yukata clung damply to her skin, hiked up crudely around her wide hips, exposing the soft, jiggling flesh of her ass as Rui drove into her from behind.
His thick cock plunged deep with each forceful thrust, the slick, wet sounds of her pussy gripping him echoing off the tatami mats.
Her dark hair cascaded in disheveled waves over her shoulders, sticking to the sheen of sweat on her neck, while her ample breasts swayed sexily beneath her, nipples hardened into dark peaks from the constant friction against the table's edge.
It was almost a full week of this dirty routine.
Days and nights blurred into a haze of endless pounding, her body yielding to him in truly spectacular ways .
Rui's hands dug into the plush give of her hips, fingers leaving faint red imprints on her pale skin as he jerked her back onto his cock, loving the way her inner walls fluttered and clenched around him like a velvet vice.
At the edge of his vision, the system's blue interface flickered to life.
[System Interface: Ero-Hero Dashboard]
[Ero-Hero System:]
[Name: Rui Tanaka]
[Age: 16 ]
[Level: Beginner Ero-Hero]
[Ero-Points: 4,750]
[Skills: Stamina +25%, Strength: +28% (Multiplier: x3.2. Passive Boost from Repeated Conquests of harem member)]
[Ero-Hero arsenal: Gentle Compulsion (Lv. 3)], Lewd Lens (Active)]
[Achievements Unlocked: Incest Breaker (x2 Multiplier on Family Targets), Whore Tamer (Submission Rate +50%)]
[Quirk: Advanced Senses (Falsified)]
[Harem Dimension: 1 Slot Occupied (Obāchan - Loyalty: 92%)]
He smirked, thrusting deeper to grind against her cervix, making her gasp and arch her back just because he could.
The system rewarded every load dumped in her holes, every orgasm ripped from her aging body.
He gave a low whistle in appreciation.
"Damn, look at these numbers," Rui muttered, voice low and smug as he checked the achievement log.
As he had come to find out, stamina was stamina and each daily fucking session had cranked his endurance, turning him from a regular teen body into something definitely superhuman.
After the first fifty orgasms, he could sprint for two hours without breaking a sweat now, leap across the two meter tall fence around the property, and even scale the side of their large traditional house like a spider if he pushed it.
Strength had followed suit when he reached a hundred.
He could lift up to a 100kg now! Something he couldn't even dream of doing in his old life.
And the multiplier? It ticked up with every new 'conquest' or milestone, promising exponential gains.
No wonder the system dangled it like bait; it made railing Mio not just satisfying, but also gave him a power-up.
"Fuck, Obāchan," Rui growled, turning away from the interface, his voice a husky rumble, leaning forward, his chest pressing into her back. "You're turning into the perfect little slut for your grandson. Look at you, taking every inch of my cock like it's the only thing that matters."
She hollowed her spine instinctively, pushing her ass higher, her body trembling with desperation, her lips parted in a breathless gasp. "Yes, yes, Rui's cock is the only thing that matters. Please Rui use it to defile me and fill this old pussy until it's overflowing with your seed!"
The constant use of compulsion wove through her each word but after days of relentless conditioning, her pleas rang with genuine hunger, her hips grinding back to meet his thrusts with sloppy urgency.
Her initial resistance had melted under the system's influence, her body betraying her with slick arousal.
Now, she initiated as often as he did, her eyes glazing with lust at the mere sight of the bulge in his pants.
She was truly his personal slut now.
And she did as commanded without questions.
Take point, his enrollment into the prestigious UA academy.
Apparently Obāchan had been a hero in her youth (which made a lot of sense as to why she was his first target).
She had been the 'Silver Sentinel,' a low tier pro hero with a minor enhancement quirk that gave her periodic boosts due to the increased amount of regenerative cells in her body, healed minor wounds and kept her running at a hundred percent when most would be on their way to a fatigue coma.
She was literally a walking energy drink.
Also good to know was the fact that her quirk also gave her basically no refractory period (due to said rapid regeneration of her cells) which he abused relentless when he fucked her to orgasm again and again.
Unfortunately, she had fallen in love and got pregnant at the ripe age of 19 which had derailed most of her delusions of being a great hero as she chose to become a housewife and take care of her daughter.
But Mio still had the contacts of some big shots in the industry, colleagues and friends who had managed to make their mark in hero society.
Coupled with the fact that his late grandfather had been a part of the Hero commission before he retired, it made it pretty easy to scam his way into UA.
The morning after he'd wrecked both of her holes, she'd managed to drag herself to the phone to make good on her promise, voice still hoarse from all the screaming and had quietly pulled some strings for him to gain entry.
Messages to two retired pros who graduated from UA as their alma mater and one call to a chair person on the hero commission, and boom!
Rui Tanaka was in UA by recommendation.
He didn't even have to go for an entrance exam like the masses or even a group recommendation test with the other pro hero kids.
Due to the discreetness of his admission, all he had to do was a personalized trial to 'assess potential.'
The exam itself had been a joke, thanks to his boosted skills.
They'd set him up in a secluded training ground on the UA outskirts: an obstacle course rigged with mock villain bots, climbing walls, and agility pits, followed by a written test on hero ethics and quirk theory.
Rui had breezed through it two days ago, his enhanced stamina letting him dash across the course without fatigue.
He scaled a 20-foot tower in seconds, fingers digging into concrete like it was clay, then dismantled the three level 1 bots with precise strikes, denting their metal plating.
The proctors, the gun-hero whatever his name was and cementos had blinked in surprise at the sight of his 'Advanced Senses' quirk in action, which was what had been listed on his registration documents Obāchan had submitted at his command.
'Adavnced senses gives the user heightened reflexes and almost superhuman agility,' his brand new quirk registry file read, a perfect cover for him in the hero school.
No one questioned it; why would they, when he performed like a gold medal olympian?
He did all this because scrutiny was the last thing he needed (Especially from that cunning rat of a principal!)
Not when his real goal was building a harem of UA's finest bitches, those spandex-clad bodies ripe for conquest.
Obāchan was just the starter pack, her daily milkings padding his points and powers.
---
[A/N: You can read @dvanced chapters and see exclusive character illustrations on my P@treon. Think of it as supporting me. I would truly appreciate your support. Link below. Remove the spaces after copying.]
pat re on.com/HathorRa
Ps. I created a discord for those that wanted to see the character illustration for Mio and rui. If you want to vibe or have suggestions for future chapters, be my guest and go check it out now!