This has mature content. You've been warned~

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It had been three months since (Y/N) started living with Law and the heart pirates and she was currently stomping through the halls of the submarine while the crew dodged out of her way since it was clear that she was mad. 

They all loved her but ever since she entered her first trimester, her mood swings were lethal.

"Trafalgar!" she yelled as she slammed the door to their bedroom open.

Without flinching or taking his eyes of his work he responded calmly.

"What is it (Y/N)?"

"Take the submarine to the surface." she said with a calm and frightening voice while she crossed her arms.

"Why?"

"What do you mean why?! It's too damn hot in here! I need fresh air or I swear to God I will set this ship on fire!"

He got up and walked over before looking over her shoulder to Shachi and Penguin.

"You heard the lady." he said and they quickly scattered.

"Happy?" he asked as he attempted to hold her, only to have his arms slapped away.

"Don't touch me it's too hot." she complained before walking off.

He sighed and shook his head to himself. He was used to this but damn she could be a handful.

But he wasn't too judgmental since she was carrying his daughter and son. He could only imagine the discomfort she was going through.

Once on deck, (Y/N) was holding onto the railing with a content smile on her face as the fresh breeze caressed her face and softly blew through her hair.

She felt a pair of arms wrap around her waist and tattooed hands gently placing themselves on her tiny bump, making soothing motions across it.

She held his arms and let herself fall back against the firm comfort of his embrace.

"How are you feeling my love?" he whispered into her shoulder before placing a kiss.

She hummed and turned her head to meet his lips briefly before answering.

"Much better.~" she grinned into the kiss before continuing.

He pressed her closer against him while deepening their kiss and felt himself twitch slightly at the sound of her moaning.

Suddenly he pulled away immediately, causing her to whine.

"Oh come on Law, every time? It's not like they know." she said rolling her eyes.

"Still." he said looking away before his eyes widened and he choked out a groan.

"Are you saying that you can be without it until they are born?" she asked innocently as she palmed the growing bulge in his jeans.

He looked down at her growling and she only smiled in return.

"It is almost five months left though." she purred while rubbing his now growing erection. "But–" she leaned up and brushed her lips against his ear before whispering. "–I really want it Law.~"

His pupils blew wide before he picked her up bridal style."Room." and suddenly her back met the familiar softness of their bed.

He climbed on top her but kept a safe distance to not put pressure on her belly and she rolled her eyes at this.

"I'm not going to break Law." she laughed while raising her brow at him.

"I know. I'm just being cautious" he muttered with a frown.

She rolled her eyes again and sat up before pushing him down.

She got on top. "There, now you don't have to worry." she smirked before leaning down and connected their lips.

He sighed happily into the kiss as his fingers tangled into her hair before taking control and began to deeply explore her.

She pulled away before moving down to his jaw and nibbled on the skin beneath his ear. She hummed in approval when hearing his breath catch in his throat and feeling his chest beginning to heave.

"Let me take care of you today baby.~" she purred while moving down his neck, leaving her own streaks of art to match the current ones across his skin.

She let her teeth gently grace across his collarbone and listened to the delightful sounds that escaped his lips that just spurred her on.

She got an idea that she just knew he wouldn't be prepared for as she made her way down his chest. She's never done it with Law before and had no idea if it was the hormones that made her desire this all of a sudden or not.

She left another bruised and wet trail down his chest while gracing her nails along his v-line. After hooking her fingers in the hem of his jeans, playfully tugging at them, this earned a surprised gasp from him.

"(Y-Y/N) what a-are you–"

"Shhh.~" was the only sound coming from her lips before they peppered soft kisses along his v-line while she unbuttoned his jeans and slowly pulled down his zipper.

He trembled and let out a shaky moan as she pulled down his jeans followed by his underwear and let his member out before blowing cold air on it.

"(Y/N)..."

"Shh, just enjoy this." she purred before dragging her tongue up his length.

He groaned and restrained himself from grabbing her hair by grabbing the sheets instead.

She chuckled before pushing her tongue in the dip of his head before wrapping her lips around it, but teasingly pulled away and ran her tongue along his length once more.

"Hahh...(Y/N)... Please–" he panted while his chest heaved rapidly.

She pulled away slightly and gave him an innocent, yet sadistic smile.

"Did I just hear the great Trafalgar. D. Law, beg?"

He only glared down at her and she shook her head in disappointment before just barely putting her lips on the head of his length again. She pressed her tongue against the vein and he threw his head back.

"Ngh!.. Fine – please!" he groaned.

"Please what?" she asked sweetly.

"(Y/N)." he warned.

"Baby, I can't do anything if I don't know what you want." she purred as she palmed his now painful erection.

He groaned impatiently. "Put it in your mouth..." he hissed.

" 'Put it in my mouth' – What?" she teased.

He growled loudly, making his chest rumble and she licked her lips at the delicious sight of him squirming beneath her. She gripped him tighter before placing her lips right above him, but not close enough to bring him satisfaction. He let out a quiet whimper but loud enough for her to smile triumphantly.

" 'Put it in my mouth' what, Law? " she pressed.

"Fuck! Put it in your mouth, please!" he yelled with a strained voice.

She smirked before taking him in completely in one swift motion and he bucked his hips as he let out a loud groan.

She cupped his globes while taking him deeper with each bob of her head. He gripped her hair as his eyes rolled back and a loud moan escaped his lips.

Feeling himself getting close he tugged at her hair to make her stop but this only made her speed up her movements.

"(Y/N)–haah–fuck!" he cried out as he came and she kept him in her throat while swallowing around him, causing him to whimper as his body shook before he collapsed back against the bed.

She smiled and climbed over him while watching the beautiful sight beneath her.

His rapid breathing followed by beads of sweat coming down his forehead and neck as he looked at her through half-lidded eyes.

She straddled him and started to grind her hips down against him while smirking.

"My turn"

"I swear... you're worse... than me." Law said as he was catching his breath.

(Y/N) was taking advantage of the fact that he couldn't help but be careful with her due to her pregnancy. So she used this time to be the dominant one. Not that he complained, but it was so frustrating to not be rough with her.

She only giggled in response before grinning as she climbed off and laid down next to him.

"You do know... that I'm getting back at you... for this?" he asked in between breaths.

"Can't wait.~" she purred in his ear before biting it.

He growled in response and pulled her close as he began counting the days until the babies were born.

Law was about to walk into their bedroom until he stopped as he heard (Y/N) talking.

It was one-sided so he guessed she was on her den den mushi with her first commander.

"When?" she growled before she sighed loudly.

"Alright, we'll execute plan S.A.S.O. Yes, I'm sure. Because this is not a game Belua! Now, forward me to Navita."

She went silent for a moment before she spoke again.

"Navita. We are executing plan S.A.S.O. Yes. Yes, I have informed Belua. Keep the information to a minimum with the rest of the crew. The instructions I gave Belua are for mine and your ears only. Yes. C out." she said before turning off her den den mushi.

"You can come in now." she sighed and Law walked in with an odd look before she laughed.

"You keep forgetting that I am very observant my love." she smiled as she wrapped her arms around his neck.

"What was that about (Y/N)?" he said as he moved her arms away while looking at her seriously.

"Law, you know that I can't tell you everything. It's too dangerous."

"You are being unfair (Y/N). Not just to me, but to our children as well if it's something that could risk your life."

She sighed in defeat before taking his hand and sitting them down on the bed.

"I'm going to be brief because there are some things I really can't tell you, okay?" she said seriously and he nodded.

"Because of some cooperations I have, some newly leaked information has compromised said cooperations. Doflamingo spilled the fact that Kaido is my father." she sighed and Law's breath hitched in his throat.

She nodded sadly. "So to keep my crew safe I've executed a plan to ensure their safety and silence. " she finished.

He simply nodded, not knowing what to say.

"Don't worry." she smiled while cupping his cheek "Nothing is going to happen to me." she said gently before pecking his lips.

He nodded again before pulling her into a tight hug while keeping a hand protectively against her stomach. She buried her face in his shoulder to hide her worry.