In Naruto as Ten Tail

Kokuo looked at his cock which knocked at her entrance from the gaps of her finger and her inside trembled. Then Tsukimi's husky voice came, sending shivers down her spine.
"~I am going in~"
With a single push, Tsukimi slammed his penis directly at the entrance of Kokuo's womb causing her to contract the muscles around it. She gasped at the sudden moment.
*Gasp*
"Mmmm~, ahnnn~'' Kokuo nibbled on her fingers to hold her moan as she spasmed from the sheer pleasure she was feeling, her toes curled and locked her legs behind Tsukimi's back, locking him in the position.
Tsukimi grunted, feeling the pleasure around his member and continued to move.
Matatabi watched all this with a victorious smirk on her face but somehow she felt she lost even after winning seeing the look of ecstasy on her sister's face.
Tsukimi did not wait for Kokuo to get used to the pleasure and started moving suddenly.
"Ahn~ ahn~ wait!~ ~Tsuki-nii!! Tsukii-nii!!." She moaned harder and harder with each thrust. She looked at Tsukimi with a look of passion and love from her half-closed eyes. Seeing that look, Tsukimi increased his pace even more.
"Anh~. Ahn~ Mmm~ Harder! nii-nii. Slam it harderrr!!" Kokuo needy moans filled the room and Tsukimi responded in kind.
He moved his hand and choked Kokuo's neck making her gasp in shock and even Matatabi was puzzled.
After a moment of shock Kokuo felt her pussy tighten around his dick and something inside of her seemed to have awakened.
Her eyes gained heart shape pupils as she moaned even louder.
"Yes~~ choke me like that~" all of her shyness faded and what replaced her was a pure expression of lust and love.

Ignoring her pleas Tsukimi moved closer and bit her erect nipples that were pointing towards the ceiling using his sharp teeth. A shrieking moan with a mixture of pain and pleasure escaped Kokuo's mouth.
Feeling the weird sensation of pain and pleasure together sent shivers down Kokuo's spine and it stirred her pussy to the point of leaking like a open tap, forgetting everything she held his forehead bringing it even closer to her chest as if wanting them to merge together.
Her desperate sweet little cries turned into moans of a woman feeling peaks of pleasure that even made Matatabi's inside twitch in anticipation.
She looked at Tsukimi's dick that was ramming in and out of Kokuo's body glistening with water like liquid. The slopping sounds of their flesh colliding made the erotic atmosphere of the room even more hotter.
It did not take long before she reached climax.
"Faster~~ Cumn- cumming~~ cumming!!!" Kokuo yelled on top of her lung as her body instinctively moved closer towards Tsukimi and her chest moved upwards.
*Splash*
She squirted all over Tsukimi's lower body while her eyes rolled backwards. Tsukimi however ignored her state and continued moving his hips.
Kokuo's eyes widened, "Wait! Tsuki-nii I~ Ahnn~~ haven't mmmm~ finished Cumming~ Let me~ Ahn~ ahn~" all of her desperate pleas were ignored by Tsukimi and soon they got drowned in her own moans.
Tsukimi took Kokuo from Matatabi arma and placed his hands on Kokuo's hips while using his tail to bring Matatabi closer.
Kokuo leaned against his chest as he continued to pound her insides.
Tsukimi moved and bit Kokuo's earlobes while using natural energy to stimulate her pleasure points through it.
He did not ignore Matatabi, he used his tail to wrap around her big and plumpy breasts and squeezed them. While his other taile started making its way towards her lower part
"Mmmm~~~ ugh!! Morre!! Yesh!" Kokuo's words started to distort with her moans mixing among it and soon she came again.
Tsukimi did not stop and continued for round three, he had yet to cum even once and Kokuo was still not even close to getting tired.
After a few more rounds of Kokuo spasming and squirting Tsukimi placed her on the bed and Turned to look at his other wife.
"Sorry to keep you waiting dear." He smiled at her knowing how aroused she was and she still did not interrupt them.
Seeing the smile full of warmth Matatabi's insides stirred and her pussy started dripping with her cum dripping down her trembling thighs.
Her eyes turned hollow as she did not say anything and pounced on Tsukimi's body like a cat.
With a smile on his face Tsukimi continued his session until the dawn of the next day. Although it had only been a night on the outside it has been days for the trio.
Right now they were back in the bathroom of Tsukimi's dimension in their true forms.
They had been in their human forms for too long and wanted to take fresh air in their true body.
Matatabi stretched her body like a cat beside the pool and exclaimed.
"Ahh~~ My body feels so stiff from staying in the human form for so long." Hearing her words Kokuo and Tsukimi rolled their eyes.
Since they know their bodies don't have bones, bloods like humans and purely works on nature energy. They could not help but roll their eyes at her baseless comments.
Even Tsukimi was sure she just wanted to stretch her body and jump around which was why she was behaving this way.
Among the whole family Kokuo was one of the most energetic bunch and never sat in one place unless it was beside Tsukimi.
Just as Tsukimi thought she jumped into the pool splashing water on Kokuo who was resting against Tsukimi's furry chest in the pool.
She glared at Matatabi with killing intent Before sending a wave of water towards her drowning her in the process.
"Guaggh!!" Coming out from the depth of water Matatabi coughed up excess water from her body. "Kokuo, you bitch let me kill you."
"Go away, don't disturb my time with ni-san." Kokuo spoke lazily while rubbing her head against Tsukimi's fur.
Tsukimi smiled and used his tail to stroke her back causing her to tremble a little.
Matatabi looked at them with her hollow gaze and made her way towards them. Tsukimi saw her actions and used his other tail to wrap around Matatabi's tail.
His actions caused the cat off-guard and the next thing she knew was she found herself melting and swooning in his embrace.
"Tch, I will kill that bitch next time." She mumbled Before burying her head in his fur.