Without most of his thought process preoccupied with his apprehensions against Muzan, Nik felt a surge of motivation the moment he commenced his training. As taxing as the fine control of a single strand of gravitational wave turned out to be, Nik simply wasn't exhausted. His face still showed a bright expression as he simply sat in meditation, waiting for Saeko's arrival while looking back at his own mistakes.

He had spent too much time on fearing Muzan that he had completely written off the option to actually face him head-on. Of course, even now, there is no real need of facing him head-on. He could simply squash Muzan, too.

After all, with enough control and magnitude, Gravity could destroy cities, not to mention a single, ancestral demon. And the thought of fearing someone even without meeting that person for once disturbed Nik greatly. 

His mentality is still somewhat flawed, that Nik now understood and all he could do is enjoy the process of his training to the utmost before actually standing in front of Muzan when the time called for it.

He would definitely survive the month-long mission, not for Elizabeth's present, well... that, too, but also, he wanted to survive and overcome his own fears.

Or at least, try to accomplish that objective.

"You look refreshed."

Saeko tapped Nik's shoulder before letting her arms slither through the gap between his arm and torso as she hugged his chest while kissing him on the side of his neck.

"With a girl like you, no man can go stale."

"Sweet talk won't save you from the beating."

Saeko smirked as she allowed Nik to take her chin into his index and thumb before Nik pecked her on her lips and then the tip of her nose as he broke into a wide grin.

"I think this time, things will go a bit differently." 

Nik stood up and walked up to the surface of the water and instantly, the ripples of Hamon spreading through the base of his foot grew a bit erratic before Nik willed his Hamon to return in a constant state of release as Saeko chimed from behind.

"Ohya? Already losing your foot? That's not like you."

Without replying, Nik smirked and entered the stance with his wooden sword while Saeko jumped and immediately unleashed her strike. Unusually, Nik even failed to raise his sword on time for the strike struck past a blow due to a few inches of difference, right across Nik's chest.

But instead of flying around, as usual, Nik was only forced to take dozens of steps back in a hasty retreat while Saeko frowned and observed her own hand.

'Right now... this feeling...'

She looked back at Nik with a confused expression as he slowly steadied himself over the pool while cleaning the thin trail of blood leaking through his cheeks.

Silently, Nik entered the stance once again as Saeko rushed forth. During the spars, instead of words, emotions and intentions are conveyed through attacks. Of course, Nik wasn't skilled enough to express himself through his technique and movement, but he was able to understand Saeko's curiosity as she struck minor blows to properly gauge the most recent change within his body.

After a few precise, non-parried strikes, Saeko finally narrowed her eyes and inquired softly.

"You are heavier... unnaturally so."

She waited with her wooden sword ready to strike as Nik nodded and smiled happily.

"I guess, controlling a strand of the gravitational wave without fearing it makes the entire process easier and smooth."

For a moment, Saeko couldn't process Nik's words. Her mouth remained hung open as she looked at Nik with a dazed expression.

"Come again?"

Nik smiled and extended his sword over to Saeko's, placing it above her arm and immediately, she felt the increased weight.

"We are entering the fun and progressive phase of training, dear. Don't get so shocked just yet."

Nik winked and entered the stance to once again take a beating. Of course, this time, with additional weight pulling him, making him focus on his own Hamon control deliberately, his situation grew worse than usual, but all in all, the training was effective.

Due to the additional pressure, the greatest benefit of the spar was the much-awaited qualitative improvement to his sword skills. Even though Nik has never been a blade enthusiast, he did invest a lot of his time and hard work to polish his skills. 

When the feeling of progress finally emerged, Nik couldn't help but feel emotional. All this time, he felt like he had just been swinging his sword without directing its sharpness and only after feeling the difference between his pressurised state did he manage to achieve the qualitative breakthrough.

"Amazing... so, right now, you are controlling Hamon, Pheromones and Gravity at the same time..."

"Yes?"

Nik nodded in approval while Saeko pursued, "And... you have been sulking for no progress just after a few weeks of training while having your mental ability already occupied with so many processes?"

"Now that you state it in this manner... I have truly been impatient and somewhat egoistic. Thank you for pointing it out."

Saeko nodded at Nik's agreement and let out an envious sigh. 

"No, your existence is truly an eye-opener." Saeko smiled and looked at her wooden sword as she brandished it with a swift wave of her arm.

"I guess, I have gotten too lax on my training."

Understanding that instead of comfort, Saeko probably needed his support, Nik stood up with a soft groan and closed in the distance between the two before taking her sword-wielding arm into his hand while moving behind her body as his free palms immediately slithered across her butt, grabbing them ferociously while kissing her on her cheek.

"Just a few days more and I'll probably be able to transfer the pressure over to your body, too."

Nik whispered with his hand over her arm slowly trailing towards her shoulder in a slow, tantalizing manner, making Saeko narrow her eyes as she enjoyed the sensation as Nik's final whispers sealed the deal to one of her many wet dreams.

"Hey, Saeko... I wonder how it would feel with the extra weight pressurising my cock..."

Nik immediately pulled her tight yukata up as he led Saeko's body against one of the myriad trees in the backyard, pushing her till the point of bruising yet making Saeko moan sultry and deliberate manner while Nik rubbed his member against her butt crack, making his shaft dig into her two sweet, perky butt cheeks while slowly slithering his hand into her clothes, massaging the side of her breasts.

'Well, you shouldn't stop now... take the responsibility.' Saeko's soft whisper rang within Nik's consciousness as a wolfish grin touched his lips.

"I am nothing if not a responsible man."

And with that, his responsibility plunged deep into Saeko's lust ridden snatch soaked in juices as his free hand immediately covered her mouth, cruelly taking away her bliss to moan as her nerves wreaked in pleasure.

To make the experience even better, Nik raised Saeko's left thigh while finally being able to go balls deep into her, spanking her lovable crotch with his balls while seizing her lips, lapping her saliva.

'Thiis ish tha besssttt!' In panting slurs, Saeko's words rang into his consciousness while Nik continued pumping deep into her fleshy snatch.

No matter how tired he was, Nik had this intuition that when it came to sex, he could easily feel powered up again, which was a stark contrast to his mentality a few days ago when he started to feel spending time with his girls as a part of the 'routine', something that deeply impacted him.

Spending time with Saeko, Shizuka and Shigure, no matter if it was training or not, was never a routine until his own mind grew numb out of fear of the unknown.

But now...

Nik's eyes trailed across the half-clothed Saeko whose butt cheeks trembled with each pump while her legs twitched and the toes of her right foot extended just to feel the curve of his cock... Nik started to feel a strange sense of contentment.

Finally, after Saeko's third thrilling orgasm, Nik let out a massive spurt of his seed straight into her womb and once again, the primal feeling to impregnate emerged within him. To feel Saeko going ripe with his seed with a blissful expression on her face.

Tuc

A wave of warm, whitish glow emerged from Nik, covering his and Saeko's body for an instant where Nik and Saeko felt their minds connected to a primal level and a relieved sigh escaped both of their lips before Nik took his member out, instantly, a wave of white leaked through her snatch, trailing down her thighs as they both collapsed down.

Only now did Nik feel his injuries flaring, but the sight of the blissful Saeko pleased him greatly.

After helping her clean up, Nik finally left for Shizuka's room where Yuriko is being tended to. Opening the door, Nik smiled and immediately collapsed near Shizuka, finally feeling his body unable to move anymore as Shizuka simply started the procedure.

It was then that Nik felt his Pheromones getting a slight reaction from Yuriko's direction, finally attracting his attention.