Chapter 1

“It seems so.”

“Uh!”

“It was the opposite.”

Ash, smiling as he spoke, pushed the tip, which was still at the entrance, into the narrow gap.

Puk.

The insertion happened much more sharply than expected.

“Ah!”

Erin involuntarily opened her mouth and gasped at the awl-like weapon piercing her in an instant.

The inside became tight. The skin pressed together as if refusing to allow even the smallest gap, thumping as if her heart was beating there. Regardless of her will, Erin felt the inner flesh fiercely biting down on the intruder.

“Ugh!”

A low groan escaped Ash’s lips.

He gently rubbed her cl*toris with his thumb to soothe her, but the convulsing inner wall showed no sign of stopping. Frowning, Ash steadied himself and began to thrust his hips.

“Ha, uh, uh!”

Her sweat-soaked, pale skin rippled up and down sharply with the man’s movements, repeatedly causing small waves.

As if enjoying it, Ash gripped Erin’s waist tightly and exhaled a low breath into her ear.

“Hh, ugh!”

It felt as if her ear was on fire. Erin whimpered unintentionally.

“Hng, hng, Ash, it’s too deep…”

“I have to go deep, Doctor.”

“Hng, ah…”

“I have to put it all in your womb, right?”

At his teasing whisper, her inner walls convulsed again. It was a reaction she couldn’t control.

“Not a single drop should leak out.”

“Ah, uh….”

“You’ll take it all properly this time, won’t you?”

Even the suggestive words were an excessive stimulus.

Unconsciously, Erin tightly wrapped her trembling legs around Ash’s waist.

“…Ha.”

In the blink of an eye, a warm sensation filled her inside.

“…Ah?”

Realizing what it was, Erin flinched.

It was an earlier climax than usual.

‘Huh?’

Erin’s eyes widened, half lost in pleasure.

“…W-wait, Ash, I-I’m coming…!”

Even as he was ej*culating, Ash didn’t stop moving his hips. He didn’t seem particularly flustered.

Squelch, squish. She could feel white clumps dropping from their joined bodies. Her gripped waist ached as if things were just beginning.

Erin, already standing at the peak, felt her mind go blank.

“This won’t do. You begged me to squeeze it out, and now you’re letting it leak again.”

“Ah, uhh!”

Erin wanted to protest. ‘No, it’s because you came too much. It’s already full inside, so there’s nowhere left for it to go!’

But those words were swallowed up in her broken speech. Ash just drooped his eyebrows and shook his head as if he couldn’t help her.

“This is what you wanted, Doctor. You shouldn’t waste it.”

“A-Ash. Hhh…!”

“There’s no helping it. I’ll give you more.”

The sensations pouring into her already climaxing body felt almost violent. She could feel heat boiling up all over.

“Ah, hhh….”

Erin trembled with passion so intense it felt as if she would break. She felt the vibration from the man’s body, locked tightly between her legs. It was a vibration accompanied by a low laugh.

When Erin reached out unconsciously, Ash grabbed her hand.

Then, at her fingertips, he pressed his lips as if stamping a seal.

“It’s not over yet, Doctor.”

“W-wait….”

“You said you have to show the results of the experiment.”

Ash moved his hips again, as if the s*men already filling her wasn’t enough, laughing as he did.

“No matter how many dozens, hundreds of times I ej*culate… If you take your medicine, pregnancy is impossible.”

“Hhh!”

“You have to prove it, don’t you?”

Dozens, hundreds of times… The words made her vision spin and turn white.

Puk!

Soon, inside her, his hardened member swelled again with strength. Erin involuntarily opened her mouth and gasped.

‘Right. That was our contract. To prove that, no matter how much, no matter how many times, I can’t get pregnant…’

The reality of joining bodies with her assistant and receiving his s*men for that purpose suddenly hit Erin.

Rather than cooling her body, that fact made her feel even more heated, which was a bit bewildering.

The more Ash squeezed and caressed her as if he would burst her body, the more her senses screamed at every touch.

“Hh, mm!”

Feeling her reason slipping away in her excitement, Erin blinked her dimming eyes.

Yes, so…

How did things end up like this…?

【 This all happened because there was no contraception 】

A few months ago, Leshamur Laboratory.

“Uuuugh….”

Erin groaned, clutching her head as she tried to get up but failed. Maybe it was because she’d slept all night with her head on the desk—her body felt terribly stiff.

“I should’ve mixed my drinks more carefully.”

On top of that, she’d mixed all sorts of potions with energizing and awakening effects, and now her head hurt like it would split open.

Even if she drank until she was dead drunk, she never got a headache like this.

“This is all because of the experiment… Ah!”

‘Right. The experiment!’

Rubbing her aching temples, Erin flailed her arms. Crash. She heard a pile of reports topple at her fingertips but didn’t care.

Fumbling, her hand finally grabbed the experimental beaker.

It was a beaker containing a freshly distilled and refined new drug.

‘Is it done?’

Her head shot up suddenly. At the same time—swish. Something fell off her shoulder, but she didn’t have time to look back.

“It’s… done, right?”

The new drug glowed with the mysterious pink she’d expected.

‘It looks a bit like a love potion or some aphrodisiac.’

That could be changed later anyway.

Erin stared at it for a while, drunk on excitement and accomplishment.

Tap.

Someone took the beaker from Erin’s hand as if collecting it, and put another cup in her hand. Steam rose from the warm contents.

“…Ash!”

“Did you sleep in the lab again?”

Turning around, Erin saw Ash.

Three years ago. Since starting this experiment, he was the first and last assistant she’d ever hired.

Today, as always, he flaunted his handsome face, looking down at Erin, his superior, with a hint of pity despite being just an assistant.

His red eyes shone in the morning sun, always seductive. His perfectly chiseled features, manly thick brows, and broad frame—all seemed the very image of masculinity, far from a typical researcher.

Even his thick glasses, which would look like a beauty-blocking item on anyone else, seemed like a celebrity’s fashion accessory on Ash.

But today, his looks—which would normally dazzle Erin—had no effect.

Her attention was completely elsewhere.

“Give it back!”

Erin’s small, white hand reached for the beaker Ash had taken. Ash dodged easily, tapping the cup he’d handed her.

“Drink all of that first.”

“Hmph….”

“Speak like an adult and finish your soup.”

“Hmph, I say.”

At his firm words, Erin replied curtly. Then, without a second thought, she slurped down what was in her hand. As she swallowed, her insides warmed, like some kind of hangover soup.

‘But I didn’t even drink… Why hangover soup?’

Strangely enough, it worked—the lingering headache vanished. Even the taste was amazing.

Impressed, Erin looked up at Ash.

‘Is there anything he can’t do?’

He was her assistant, but Ash was perfect in looks, meticulous in experiments, and even great at cooking and cleaning. A true jack-of-all-trades.

‘Of course, he wasn’t good at everything from the start—it improved over time.’

She remembered hiring him as soon as he showed up at the lab, then rationalizing the burnt coffee he made because of his face.

‘And he got better so quickly.’

Erin soon finished her soup, slammed down the empty cup, and shouted.

“There. I finished. Give it back.”

“You always spill it everywhere when you eat.”

Ash frowned and casually wiped Erin’s lips, pressing them together. It happened so often that it no longer surprised her.

Seizing the moment, Erin almost lunged at Ash, who was carefully wiping her lips.

“I said give it!”

Ash caught Erin’s body without effort and reflexively raised the beaker high. As she struggled, Erin’s body pressed tightly against his.

“Doctor.”

Ash’s brow furrowed slightly.

It seemed he was bothered by her slender body rubbing against him, but Erin didn’t even notice their bodies touching. Her soft chest pressing against Ash’s firm chest didn’t matter to her.

Right now, all she saw was the beaker Ash had taken.

“You’re my assistant! You shouldn’t interfere with my experiment!”

Ash sighed and looked down at Erin slowly.

“As your assistant, I have a duty to look after your health.”

“That’s….”

“You always stay up late, sleep messily in the lab, take random medicine even when you know you shouldn’t….”

“…You can stop doing that now!”