Author's Note: This story has been percolating in my mind for a very long time. It's an adaptation to a short I wrote several years ago with the unique Usa/Mamo flavor and a Sailor Moon storyline additive. Please keep in mind that in my stories, Chibi-Usa is a twin, because I couldn't stand the thought of her being an only child...

Let me set the scene... Usagi is twenty-one, which would make Mamoru twenty-four (Manga age difference because Anime ages are creepy AF), in the anime, they get told something is going to happen on Usagi's twenty-second birthday... That's what this story is all about.

It is not connected to any of my other stories, just a fun little moment I decided to write. And I'll warn you, it's a bit shorter than my normal one shots.

Conception
A Consequences Story

Mamoru set his medical bag just inside the door, quietly making his way to the bedroom he shared with his beautiful wife Usagi. He knew she would be ready, laying just as he had told her to, spread open for him on their bed. By now it was likely she would be sleeping, but he didn't mind. It increased the fun as he woke her up. They had a date with destiny. It was finally time, and he couldn't be more thrilled.

His breath caught when he opened the door and saw her, golden hair spread across the pillow, and the sheet barely covering her tight little body. He wanted this, wanted it more than anything he had ever wanted before. It was time. He'd been imagining this day since her sixteenth birthday, the day he'd finally made her his completely. Ever since they had been extremely careful.

He'd been in medical school as she finished high school, while at night they both fought through two more serious big bads that had appeared through the years. Now was a time of peace, though they all knew it wouldn't last for long. Within two years something major was going to change the world.

He shook his head. No, he wasn't going to think about that right now. He was about to fulfill his greatest fantasy ever. Getting his wife pregnant. He didn't know why the thought stirred him so much more than any other, why it made him harder than steel and ready to tie her down and take her over and over again. It was just his fantasy.

He stood in the doorway, leaning on the wall as he watched Usagi sleep. She was breathtaking. Tiny, as the years hadn't added a single inch to her height. She made soft little snuffling noises in her sleep. Her legs were spread, the knees out to the sides. Her breasts rose and fell with each breath, nipples barely covered, with the sheet slipping a little with her every breath.

Usagi was beautiful. He couldn't wait to see her cerulean eyes open, her lips curve in that special smile she only gave to him. He couldn't wait to take her, fill her, claim her completely. The long blonde hair spread over their pillows made him smile. He liked wrapping it around his hand as he took her.

No sound was made as he stripped his clothing. He was ready to climb between her legs. With a slow tug he pulled the sheet away from her body, tensing as her nipples peaked with the movement. Oh yes, today was the day. He wanted her filled with his seed. Wanted to watch her body change as his children grew within her.

And then, when the twins were born, he was extremely excited to do it again. And again after that.

He could imagine the changes her growing belly would make on their sex life. They would have to try different positions to see what was most comfortable as she grew rounder, though he liked the thought of simply curling up behind her and slipping inside. His dick twitched at the thought. There was something incredibly erotic about the thought of his wife carrying his children inside her body.

He slid up the bed over his newly exposed wife, as silent as he could be, and pressed his nose to her soft pubic hair. Her smell drove him wild. No other woman had ever captured his attention like she had. His little Usagi. He spread her open with his rough calloused fingers. He was gentle, not wanting her to wake until she was on the edge of orgasm. He licked in a long swipe, the length of her slit. And again, then a few more times, before lowering his mouth to her clit. He sucked it in and ran his tongue over it. Usagi moaned and spread her legs wider.

Mamoru pressed his hands under her ass and pulled her to him tightly, all his attention focused on bringing her to ecstasy. He wanted her screaming his name as she woke. With each suck, she moaned and thrashed, but was held still against his mouth, his tongue teasing, teeth nipping, lips sucking. Pulling one hand free, he slid a single finger inside her, testing her readiness for him.

Already his beautiful woman was soaked. Her legs opened and closed, her body undulated, and she moaned his name. Mamoru increased the suction, and slid a second finger inside, curling his fingers to find the spongy area of her g-spot. scissoring them open and closed as he rubbed her roughly. With a scream, Usagi lifted off the bed, wild in the throes of orgasm, and called his name.

Mamoru smiled and hummed against her clit, knowing it would overstimulate her, making her completely helpless to his first thrusts.

She stilled in shock, and he used the moment to sit up, spread her open, and plunge his cock deep inside his wife. Today was the day. He was going to fill her completely. He drove deep, loving the feeling of being bare inside her. Her folds were hot surrounding him, and he nearly lost control as her channel spasmed around his cock. He held still, deep inside, for several long minutes, one hand around the base of his hard member to keep control. He wanted this to last, to be remembered forever.

"Mamo?" Usagi moaned, unable to even complete his name, her hips writhing against him as she begged without words for him to take her. Slowly he withdrew, nearly pulling out before sliding home again. He could feel every heated, wet fold over him. Pure bliss. Each movement was deliberate, and though she squeezed around him, trying desperate to urge him on, he held out, wanting more.

"Feel that Usako?" he muttered. "Feel my cock? No condom to protect you today."

He pulled out and thrust home again, a little faster, just barely harder than before. He wanted to fuck her brains out, make her incapable of speech with pleasure. They'd found their limits together. Both could take more because of their powers and increased ability to heal. Which meant that they would be doing this again and again. He grinned at her.

"Mamo-chan!"

She tossed her head from side to side, her hips lifted and lowered, bucking against him. He didn't normally talk during sex. This was something new, and erotic for both of them. He could feel her intensity through their bond, the need she had to be taken hard and fast, her want of him to fill her up over and over, to be possessed by groaned. He loved that she was as possessive of him as he was of her. He thrust again.

"I'm gonna fill you Usagi. I am going to paint your insides with my cum. I'm gonna give you my babies Usagi."

She gasped and moaned under him. Thrashing even more wildly, unable to speak, to articulate what he was doing to her, both mind and body. She didn't have to. He could hear her thoughts and needs in his mind. This was the most erotic thing she had ever experienced. Being told he was going to plant a baby in her. Could anything be hotter?

His movements were slow and sure, even tame, considering just how turned on he was at the thought of impregnating his wife. He wanted her begging for his cum. Slow, tempered movements, in and out. He was driving her nearly mad with need. Her desire met his in his brain, rebounding back to her and increasing, before coming back on an endless feedback loop that made it nearly impossible to hold himself back.

"Fuck Usako, you're so fucking tight. I'm going to fuck you again and again all night. I'm gonna fill you with so much fucking cum you should have triplets. Feel my cock inside you? Feel how it twitches? You do that to me Usako." As he spoke, his thrusts became faster, slightly less controlled. "Beg me Usagi. Beg me to fill you with my cum."

"Please!" Her hips came up, and her fingernails dug into his shoulders.

"Please what Usako?" He slammed home several times while he waited.

"Please cum in me. Please!" Her whole body was shaking now, her channel clamping down on him.

"Why do you want me to cum in you Usako, my beautiful little wife? What do you want?" He pulled nearly out and hit home so hard she screamed.

"I want…"

"What do you want Usako?" He moaned as she twisted under him. He was nearly there, nearly ready to fill her. "You want my babies don't you Usako? You want me to fill you over and over until I plant our children in you. Don't you Usako?"

"Yes!"

"Say it Usako." He sat up, pulling her up onto his thighs so each thrust hit her cervix hard. "Say." Slam. "It." Slam.

"I want…. Mamo-"

She screamed as another orgasm took her, and Mamoru nearly lost it. He struggled to hold back. He wanted this perfect. He slowed his pace, waiting for her to come back down to earth. Sliding in and out of her, he watched her face as she came down from the orgasmic bliss. It was beautiful. Every time she came he thought it was the most incredibly beautiful thing he'd ever seen.

"Beg me Usako!" he ordered when she was aware again.

"Please Mamo-chan! Please!"

"Please what Usako?" A hard thrust nearly made him lose it, but he gritted his teeth. He wanted the words.

"Please give me your baby!" She screamed it, orgasming again at the thought. "Mamo-chan please!"

Finally, Mamoru let himself go, slamming into her again and again, lost to everything but the sensation of her tight walls gripping and pulling at his cock. Again, and again he pulled nearly out before forcing his length back inside, banging against her inner walls, shifting her again and again. Over and over he slammed home until she said please again and he lost himself, spraying her insides with his seed.

Mamoru didn't pull out. He wouldn't move, praying that if he held still none of his cum would seep out of her. He wanted her pregnant. This was the day it would happen. And if he had to fuck her a thousand more times for the next three days to get the job done, he would do that. She was his, and he was hers, and they wanted their babies.