Adulterous Experimentation (Sailor Moon) - Cover

Adulterous Experimentation (Sailor Moon)

by sexdottxt

Copyright© 2025 by sexdottxt

Fan Fiction Sex Story: Walking the palace of Crystal Tokyo, King Endymion finds Ami alone in her lab. Having already had his fun with her in the past, he is is ready for an encore performance.

Caution: This Fan Fiction Sex Story contains strong sexual content, including Ma/Fa   Consensual   Heterosexual   Fan Fiction   Cheating   MaleDom   Rough   Cream Pie   Oral Sex   Tit-Fucking   Big Breasts   Leg Fetish   .

King Endymion had it all. He was a hero with all kinds of magic powers, ruler of the known world, had a totally smoking hot wife, and anyone who looked at him would think he was the man. And he knew he was all that and more.

For that reason alone, he only wanted more. No wonder he wouldn’t just be satisfied with his lovely wife, Usagi was a natural beauty to be sure, but the other Sailor Scouts were just as gorgeous. Getting an eyeful of all of them in their naturally skimpy senshi outfits back in the day as a teenager and not turning into a raging poonhound was hard enough, and here resisting those urges was still just as bad as ever. And being the king of this castle, he fully intended to satisfy his lusts.

He went to the lab knowing exactly who was there. She was indeed, Ami Mizuno just wearing a lab coat and busy at work, looking through a microscope. Short blue hair, you’d think she was some alt type girl, instead she was a straight up nerd. If only all nerds looked like her though, she kept that blue hair in a bob and was just as fine as the other scouts. In that big labcoat she was wearing, he could see the shape of her big rump on the other end. And the heels she was wearing were driving him crazy.

He locked the door behind him and closed the blinds on the glass. The sound of the door closing got her attention and she looked back. Turning herself around properly, she said, “Oh, Your Majesty! I didn’t expect to see you so early this morning!” She bowed before him.

“A king’s duty is at all hours,” he said as formal as ever. “I hope you are taking care of yourself.”

She rose up to look at him. “Yes after ... after yesterday I made sure to wash up and turn in early.” Alone with him, a lurid heat bloomed in her body. She wanted to change the conversation fast. “I’ve been up studying the strange crystals we found yesterday. I presume you are interested in my findings so far?”

She wasn’t the only one whose mind was on anything but the present. Clearing his throat to regain his prestige, he said, “Sure.”

Ami gave him a detailed report. Endymion knew he should have been paying attention, it was important information for a monarch to know and she was going in-depth with detail, she really knew her stuff. But just as he couldn’t help but notice her sweet tush on the other side, that labcoat didn’t really do much to hide her ample bosom either. She wasn’t as busty as Makoto, but with that kind of standard, nobody would ever be satisfied.

And he was needing satisfaction. As she was dutifully following orders, he moved on over to her with speed. She stopped speaking at his suddenness, he held her close by the shoulders put his lips on hers and she only closed her eyes and returned the motion. Their lips only brushed together for several seconds before he needed more. He pushed his tongue forward and without any hesitation she received it. For several minutes they held each other like that, full on kissing each other hard.

When their lips parted she regained a bit of modesty, realizing how fast things had escalated. “Y-Your Majesty...”

Holding her closer so their bodies were joined, her shorter hair gave him easy access to her neck. He kissed all over as he felt her erotic and feminine body underneath her labcoat. An all too familiar fire was burning inside of her and she held onto his great masculine frame in deep yearning, she could feel his pressure on her breasts. Ami wore that labcoat for safety, but right now she just wanted to get out of it.

“Mamo, do you really want to do this again?”

Endymion bit deep into her skin at that point, felt her shake up in his arms. Under that lab coat, he could feel her nubile feminine frame as if she were naked. It only made him want her that much more. He kissed up to her ear and whispered deep, “Fuck yes.”

That was the only answer she needed to hear. The hunger in his voice, his hot breath in her ear, it got her so wet. That close together, she could feel the monster ready to burst out of his pants. Locking eyes again, they knew the desire in each others’ eyes.

They started making out again, this time far more hotly than before. They were both feeling all over each other, each trying to get the other’s clothes undone. He could feel her sexy form underneath that labcoat and Ami knew exactly what she wanted too, feeling his crotch. He was twitching in there and she longed to have him again, to get his penis out and do all sorts of things with it. It was driving him further crazy and he pushed her down onto the table under her.

Endymion had just begun to undo the front of her labcoat when he saw the inviting curves of her cleavage. Practically ripping open her labcoat, he stared breathless at her breasts bared to his eyes. Looking down at her again, he realized that she was only wearing this labcoat and heels, she must have been wearing that little because it made her feel kinky. And he knew that deep down, this good girl was likely craving a repeat encounter with him too.

He’d give her exactly what she wanted. Embracing her, he sucked all over her tits while undoing his pants all the while. She held onto the back of his neck, crying out deep in ecstasy as he devoured her tits, it only made him long to free himself that much faster. Finally getting his pants down, he stood up before her.

Ami’s eyes zeroed in at seeing that massive cock fly right on out. Red and engorged with lust, she could only stare at it. She wanted to beg him to use it on her, to ravish her like he did last time. But her jaw was hanging open, she was speechless.

The next instant was so fast that it was like a flash. Pushing her down onto the lab table, his cock stabbed inside of her tits so hard she jumped up and he wasn’t stopping either. Grunting like an animal, he moved back and forth fast, showing her no mercy.

Pressing his hands down onto her teats, he was on her and not letting go. His dick was so big that in between her tits, it felt like her tits would have split wide open if not for his hands holding them. But those big hands of his on her teats, his palms working her nipples, and that dick fucking her hooters all at once made the brutality exquisitely pleasurable in a way that excited her beyond belief. As he kept on going at it, she moaned louder and louder.

Ami felt so weak. But at the same time, in his control, she never felt more safe either. The first time they fooled around like this, they had never gone this far and now that she was doing it for real, it felt so much better than she had anticipated. The pressure in her tits, the savagery as he mauled her nipples, she felt a funny feeling that felt even better than getting wet in her pussy. Embracing this lewd situation, she moved her body along with him, crying out loudly from the sweetness of it.

Endymion looked down at her. Her mouth was wide open and she was moaning louder and louder with each second, nobody who knew her would ever think she could be this kind of dirty little slut. It only spurred him on to go faster, with no regard for her or anyone finding them out as her relentless sounds of ecstasy incited something primal in him. He had already locked the door but her increasingly shrill wailing would normally have been cause for concern to alert somebody that something was going on. Fortunately the walls and windows were all soundproof, meaning that she was now his personal little fucktoy.

He felt Ami becoming increasingly erratic under him. She grit her teeth before she settled down, no longer moving in tandem with his thrusts but still twitching all over just the same. He couldn’t tell if she just came in her tuts and he didn’t care. That thrill of domination, her weak and jittery moans, and her breasts shaking under him, it finally broke him. Endymion suddenly shook up, blowing his load all over her face, shooting load after load all over her.

He grunted hard as he felt himself calm down. He looked down at her, her face and upper bustline were covered in his cum. His dick wedged in between her hooters was still hard, he was far from spent. Moving back, he breathed in hard, savoring what a debauched act he had just committed.

She looked up at him. Moving up on her own, she stood before him. The sight of her tits hanging out was appetizing enough but then she slowly undid the rest of her labcoat. Never did he think that a labcoat could make a sexy striptease, but her beauty and that body of hers along with her natural modesty, those heels, he couldn’t look away. Once she had it fully undone, the sight of her sexy naked form in nothing but a pair of heels shyly looking away from him made her look so sultry and seductive.

Even as she was trying to be so modest. A scarlet flush bloomed on her cheeks being so naked before her king. But then the sight of his penis, just as hard as before, caught her attention. Without needing a command from him, Ami slowly and gracefully lowered herself onto her knees before his dick as if she were revering it.

That pose was driving him crazy. Down on her knees naked in those high heels, her face and breasts splattered with his cum, she both looked so beautiful and delicate that you could fall in love with her on the spot and like a perfectly well behaved little whore who would do whatever any man wanted. Taking initiative on her own, he didn’t need to say a word for her to lean forward and go to work.

Endymion was so lusty and sensitive at that point that her soft lips and wet tongue taking in his dick made him gasp. Nor was she put off by the size of his penis fully engorged as it was, she sucked him off with no hesitation. He was already totally at her mercy, but Ami wasn’t making it easy for him either, she was moving her head back and forth slowly as she licked the hot phallus in her mouth. Her eyes were closed and she hummed in deep satisfaction, the erotic sound more like something from a whore madam than this model of an upstanding scientist. Already having cheated on his wife before, now he had no regrets.

To her credit, she wasn’t intent on teasing him. It’s just that his cock was so big and hot that she couldn’t help herself, his hot taste and the thickness of it were making her feel disoriented in the best way, she just wanted to lose herself in it. Grabbing the base of his shaft, she gradually picked up the pace, going down farther on him.

Endymion looked down at her. Feeling up her tits like a stupid slut, her nipples were thickening from the joy of blowing him, and she began pinching them in her hands. Her eyes closed, she was still moaning, and even let go of his shaft to start playing with his balls. Caressing them in her palms, she grazed them with her soft and dainty fingers. It was all so good that he was losing it.

He grit his teeth when he came, blowing his load deep into her mouth. She paused from the first few spurts, his dick tensed up and he exploded all at once before she even sensed he was on the cusp of an orgasm, her whole mouth was filled up with his spooge in a single explosion. Endymion had long since abandoned all restraint, he was pumping deep into her mouth all the while.

His dick having shot out it’s last few bits of seed, he pulled on out. Ami had a dazed look on her face at that point, there was a line of cummy spit between her lips and the opening of his cockhead, and she just sat there. He was still hard, it was both a testament to his natural stamina and the power of the Silver Crystal at work. Not to mention two strong nuts twice in a row, he was sensitive and tingling and wanting so much more. And then closing her eyes, without even being told to she kissed the opening of his prick.

 
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