The Book of Power

After a stuffed-up lunch, the three of them lounged on the living room sofa, chatting idly about nothing in particular.

Chris had slipped into nothing but a thin nightgown and panties, the fabric doing almost nothing to hide the heavy swell of her breasts or the way her nipples poked against it.

Sitting pressed against Max, she felt his arm snake around her waist almost immediately, wandering shamelessly, squeezing her hip, sliding up to cup one fat tit, thumb brushing the stiff peak through the silk.

At the same time, Elli also learned that her sister was teaching her nephew about sexual education.

Seeing that he was learning quite patiently, she also praised her nephew.

"Aunt Elli… yesterday Mom taught me about reproduction and female anatomy. I think I’ve got the basics down, but she said every woman’s body is different. She’s not exactly a professional, so I still have questions. Since you’re a doctor… could you maybe give me some more practical experience? Help me really understand."

He spoke with a smile, and Chris also held her chin in thought.

"He’s right. Textbooks only go so far. Every pussy feels different, reacts differently…" She blushed faintly. 

"Why don’t you use me as the demonstration model, Elli? I don’t mind.."

She said with a blush on her face as Elli nodded and agreed with her sister's statement. 

"Since Max is so eager to learn, I will do my best to help you learn.

But sister… you’ll have to be very cooperative. I’m going to use your body to show him everything — inside and out."

"Do I need to use explicit terms or medical terms?"

"It's okay...anyway you want."

"Okay.."

It seemed like she was quite handy...

After nodding, she reached for her medical bag, pulling out latex gloves, a clear plastic speculum, a thin probe, lubricant, and a small flashlight.

Chris obediently moved to the bedroom and lay back on the bed, knees bent, thighs spread wide in a shameless M.

The moment her legs parted, the nightgown rode up, and the soaked crotch of her panties was on full display — a dark wet patch clinging to her swollen lips as Max stared hungrily, cock already thickening in his pants.

Feeling his hot gaze, she blushed and closed her eyes instinctively.

"Sister, open your legs wider."

 Elli instructed calmly, snapping on her gloves. "He needs to see properly."

Chris bit her lip, cheeks flaming, but obeyed... spreading her thighs until the thin fabric stretched tight over her mound.

Elli peeled the nightgown up and tugged the panties down slowly, letting them drag over Chris’s slick folds.

The white lace came away glistening.

Max leaned in close, inhaling the thick, musky scent of aroused cunt he’d been filling over and over for days.

He stared at her shaved mound, with a small clit peeking out, fat outer lips plump and flushed, inner labia already puffy and shiny, the tight little hole winking with fresh wetness, before asking with feigned curiosity.

"Aunt, look, why is her side wet?" 

Elli glanced at her blushing sister, then at her eager nephew, and smiled. 

"That's vaginal lubrication — what we call 'love juice' in simpler terms. It means your mother is becoming aroused. This is a natural female response."

"What is love juice exactly?"

"It means sister is in heat right now, her body is instinctively preparing for intercourse. When a woman gets aroused under your gaze like this, her vagina secretes lubrication to make penetration easier and more pleasurable. She's craving sex, hehe."

Even under the effect of hypnosis, Chris's face burned even redder at the blunt explanation.

Elli ignored it and gently inserted the cleaned speculum as Chris let out a soft moan. "Mmmh… ahh~"

Then she slowly opened the blades, stretching the vaginal walls to display the interior.

"See? This is the vaginal canal — the tunnel that leads to the cervix and eventually the womb. See how the walls are rippling and squeezing? That’s her body signalling it wants cock. Wants a man's semen.. cum.."

She clicked on the flashlight, illuminating the glistening pink tunnel, folds glistening, contracting rhythmically

Used as a live model, Chris's face was crimson with shame.  

Hearing her most intimate reactions described clinically to her stepson made her mortified, yet the humiliation flooded her cunt with fresh heat, walls fluttering visibly around the speculum.

The warm, slippery folds, countless ridges, everything screamed to be wrapped tight around a thick cock.

At the far end, a darker, puckered ring came into view, pulsing softly, leaking a thin bead of clear fluid.

"Aunt, what is that fleshy ring at the innermost part?"

"That's the cervix — the gateway to sister's uterus. It's the final barrier protecting it. When the cervix opens fully, the uterus is completely exposed to the penis, and any sperm ejaculated can fertilize her eggs."

Elli slid a thin stainless-steel probe inside and pressed it lightly against the cervical os, testing as Chris moaned softly, hips twitching at the intimate pressure.  

"Ahhn~… so deep…"

"It seems the cervix has already been dilated recently! Someone’s been very thorough." Elli spoke, conveniently overlooking the afternoon session her sister had with Max.

"It seems that sister has had her cervix breached before!" Elli said in surprise, completely forgetting that not only her sister, even she had just had her cervix breached by Max this morning.

"What happens after the uterus is opened?"

"Once breached, pregnancy becomes much easier. The man who opens it can push his cock directly into the uterus whenever he wants. 

The protective structures lose meaning. He can pump semen straight inside as much as he likes. When the egg is released, countless sperm will surround it — and she will conceive."

Of course, she was right...

Chris's womb had already become little more than a cum receptacle for her stepson.

His cock was the key to her cunt...able to enter at will and flood her fertile chamber with dirty seed.

"Aunt… can I try? Can I open her cervix? Right now?" 

Max's cock throbbed painfully at the thought.

"Though you are stepmother and stepson, in education, all bodies are equal. Not to mention, a student willing to try is a good student. 

What do you think, sister?"

Elli looked at Chris.

The latter blushed deeply, closed her eyes, and nodded silently.

Elli slowly removed the speculum — a thick string of arousal clinging to it.

Max stripped off his pants, his thick, veiny cock springing free, already leaking pre-cum.

Elli wrapped her gloved hand around it, then knelt and dragged her tongue slowly along the shaft, tasting the mix of Chris's juices and his earlier load.

"Mmm… needs a little disinfecting first…" she murmured, sucking the head with slow, professional pulls.

Watching the gorgeous doctor-aunt worship his meat with calm, detached precision made Max's blood roar.

He pulled free, aimed at Chris's waiting, dripping cunt, and thrust in deep.

"Hoo… still so fucking good…" 

Max groaned, the head kissing her cervix with every slow stroke.

Chris bit her lip, trying to stay quiet — but the relentless battering soon had her moaning as her cervix softened, yielding under the assault.

"Push harder — it's almost open!"

Elli spoke, eyes fixed on where the thick shaft stretched her sister.

Max slammed forward with full force as his glans pressed… then suddenly — pop— the cervical ring swallowed the head, clamping tight in hot, sucking pressure, nearly making him come right then.

With a final shove, the last few centimeters disappeared completely inside her, into her womb.

Chris screamed in bliss as he started pounding her uterine walls.

In and out, his cockhead slamming the back wall of her uterus, stretching her in ways no one else ever could.

Orgasm after orgasm crashed through her, cunt spasming wildly, milking him desperately.

The room filled with wet slaps, her desperate cries, and the obscene squelch of cervix-fucking.

No condom.

Nothing to stop his seed from flooding her fertile chamber.

Max sped up, balls tightening — then buried himself to the hilt with a guttural roar.

Thick, hot ropes of cum erupted straight into her womb, painting the walls in heavy pulses during the peak of her ovulation.

"Ahhh—! It's filling my womb—!" 

Chris wailed, convulsing, milking him dry.

Elli looked at her sister's belly, shaking as she was being fertilized...

Earlier, she was surprised by the amazing length and girth of the young man's cock, and now by the amazing amount of semen he ejaculated.

"Huh… so comfortable…" Max lay on top of his stepmother, enjoying the afterglow of uterine intercourse. 

After a while, he pulled out his cock as streams of white, turbid liquid flowed out of her gaping hole.

Elli looked at his softening cock slipping out of her sister's cunt, which was full of yellow-white smelly liquid, and quickly re-inserted the speculum before the cervix could close.

Inside, Chris's vagina was flushed red, folds coated in cream, cervix slightly parted, uterus half-full of pearly semen slowly seeping deeper toward her fallopian tubes.

"Oh god… look at all this thick cum…" Elli breathed, eyes wide.

Her ovaries were practically swimming in it.  

Fertilization seemed inevitable.

Chris drifted into exhausted sleep in the afterglow, so Elli could check freely.

"In this position, the semen can flow back out. To help it stay in the uterus, let's turn her over and let gravity do the work."

So the two turned the sleeping milf over and made her lie prone on the bed, with her buttocks raised high and her cunt exposed in front of them,

like a bitch that had just finished mating, letting the load drain deeper.

"It's best to keep her like this until the cervix closes completely," Elli said, packing up. "That way, the semen stays trapped for better fertilization. I'm honestly surprised — I didn't expect you to have such a thick cock that it can breach the cervix so easily."

"Hehe, thanks, Aunt!" Max grinned, scratching his head innocently. 

"But… if my cock is that powerful… maybe you should examine it properly? Check if it’s developing healthily?"

As he spoke, he swung his still-heavy, cum-slick cock in front of her face.

The latter blushed, feeling a familiar itch deep in her own uterus as she stared at the glistening meat.

"…Very well. Let your aunt give you a thorough, hands-on examination."

Max looked at her beautiful face, her plump, sexy body, his lips curling into a lustful smile.

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