Royal Screwing

Masako had a problem.
She was married since eight years now, and still had no children. A problem encountered in many families.
But it's a national desaster if you are Masako Owada, Her Imperial Highness the Crown Princess.

Prince Naruhito had an even bigger problem.
He was as sterile as a harem eunuch, and that was a national top secret. Of course there was absolutely no room allowed for public speculation - because in blue-blooded circles the blame for infertility always goes on the woman.
But evidently a divorce would soon make his little problem crystal clear to anybody, and after all he loved his wife.
Desperate situations lead to desperate actions...

"Now this is amazing!" The prince circled around Mr. Himebouji who was found via some innocent doppelgänger contest. "Even my wife won't be able to see any difference!"
With the stress on 'see', Mr. Himebouji thought with a smirk while the prince explained for which heinous plan his services were wanted.
Of course, we have to off you afterwards for national security, but this little detail we better leave out, eh? Well, you are in for such a surprise! Mr. Himebouji smirked even broader as he was led to the royal chamber.

"Oh, Kotashi-san, tonight your hands are everywhere! Mmmmh! Deeper! Faster! Ooooh, something is squirming into my womb! Yes! Yes! I'm pregnant! I'm feeling like I'm ravished by a tentacle monster! AAAAH!"
That's because I AM a tentacle monster who has temporarily shape-shifted to human form, silly human, Mr. Himebouji smirked with all of his maws as he reverted to his usual woman-pleasing Inju form (OK, not exactly pleasing to the eye but that wasn't the relevant body part anyway), while the princess writhed, eyes closed in ecstasy, not being able to sense anything else than her perpetual orgasm. With a last squeal she dropped back and fainted.
That's because I knew of your little problem and have some of my own political plans. But I think it's time to do my big 'parting scene' now.

"I'm deeply sorry, Mr. Himebouji, but the national security..."
A body fell to the ground, severely slashed by seven samurais, while a tentacle monster retracted to the astral plane, laughing like mad.

9 months later...
The good news: It was a painless birth.
The bad news: It was not exactly human.
"No, you are not gonna take my baby away!" Motherly hands clutched around little tentacles as a hastily engaged ninja demon-extermination group entered the maternity warden.
"I second that", said Mr. Himebouji, suddenly appearing on the scene. "And nothing in the old laws prohibits that an Inju will reign on the Chrysanthemum Throne. Especially considering my son really has blue blood."
His argumentation might have been dubious, but who wants to argue with an Inju anyway? The ninjas didn't.

"So I declare you, Inju I, the rightful king." "Was about time. My first action will be a small change in the wedding laws..."
And, like in any fairytale, they happily lived ever after.
Especially Nippons women.
Of course, Japan couldn't stay world's #1 in technology with half of the population trapped in an everlasting orgasm, but well, we all have to make sacrifices...

The End (of the Author if Japan ever finds out)