Sona is going to become strong

"You mean... a liquid, a gas, and a solid?" 

"Yes." Riser nodded. "Water is an element of change, so you should let your creativity work instead of trapping in a single concept where you can only bash a large amount of water into your opponent. 

"—or the Sitri House only use their ability to shape water into a different shape, then bash it into opponents?"

"....." 

Serafall and Sona fell in silence. 

To be honest, Riser was confused at why, when Serafall was born with the power of ice, no one thought to copy it, and they just stayed comfortably with the power of water. 

Shouldn't they try something else, such as the power of steam or vapor?

Even if there was such a limitation, they should be able to combine their innate ability with magic, right?

Yet, why did they never do that?

Moreover, was it really only water?

Was the liquid not possible?

Such as blood, tears, or even sweat. 

If they wished to, they should be able to develop the power to do that, right?

To be honest, if he was originally a devil, he might not think that such a thing was possible, but as he was initially a human and also had seen few plots of the DxD, he knew that as long as one had creativity, everything was possible. 

It was the same case with Issei, who developed a powerful perverted technique where he could strip a woman's clothes instantly, suck a nipple to power up, or even talk to breasts.

If Issei could develop such a ridiculous technique, logically, the others should be able to do the same, right?

In Serafall's case, if she went even further, then she might even freeze time, yet she didn't do so as she was satisfied with the status quo. 

Nevertheless, there was no need to worry about Serafall as she was strong, and there were only a few opponents that could defeat her. 

However, Sona was different. 

Listening to Riser's explanation of how she could develop her power further, Sona was silent as she held her head, wondering why she had never done all of that. With her mastery over water manipulation, everything that her husband told her should be possible. 

Creating a mist to hide from an opponent. 

Absorbing the liquid from the opponent's body until they lose all the moisture inside their bodies. 

Changing the direction of the opponent's bloodstream. 

Creating an illusion with steam. 

There were many more! 

However, Riser knew that this mistake was all due to Serafall. While Sona might seem exasperated and even angry whenever Serafall tries to act like a spoiled child in front of her, there is no doubt that Serafall is her role model. 

Sona might have always wished to copy her older sister, creating a gigantic movement that was capable of destroying a country or two with ease, but her strength definitely wasn't that. 

Unlike Serafall, who had an abnormal amount of Demonic Power, Sona didn't have so much Demonic Power, but her control over her ability reached a frightening degree of mastery. This was her strength, but she walked and followed her older sister's path devotedly, thinking this was the best, so she was unable to use that advantage to make herself stronger. 

Watching her wife's expression, Riser knew that his wife had realized everything. 

"Thank you, Dear." 

"No problem." 

Sona was glad that Riser was her husband, and she was also glad that Serafall was her older sister. 

"Hmm? What's wrong, So-chan?" Serafall wondered why Sona suddenly stared at her face. 

"Sorry, Onee-chan." 

"Huh? Why did So-chan suddenly apologize? What's wrong? What's wrong?" Serafall was confused and scared. 

"I can't be like you, who can freeze the entire country easily. I don't have enough Demonic Power to do something like that, so I will stop to follow your path and use my own path instead." 

"...." 

Serafall fell into silence before tears like a river ran down her cheeks. 

"Huwaaa~! So-chan has grown up~!" 

Serafall leaped into Sona's body and hugged her tightly, pressing their cheeks together as she cried. 

"Geez... you don't need to act so exaggeratedly..." Sona was helpless, but she also hugged her older sister. 

"But Onee-chan is happy~! So, do your best, So-chan~! No matter what your path is, Onee-chan will support you~!" Serafall winked as she looked at Riser. "Riser-chan is also going to support So-chan, right?" 

"That's natural. She is my wife." 

"...." 

Serafall smiled as she thought that everything was so wonderful with the three of them, but at the same time, she was scared that everything would change if she were truthful to her feelings.

However, this feeling of hers, even if she kept it in her heart, didn't matter as she was happy with the way it was. 

Watching Sona and Riser happy together was enough for her. 

"By now, there shouldn't be a problem for you to develop your own techniques." 

"Yes." 

While Sona felt a bit disappointed as she couldn't be trained by him, she knew it was more effective for him to train others as she could train by herself, mastering all the techniques that she could think of inside her mind. 

"However, there are two things that I want you to master besides your water manipulation ability?" 

"What is it?" 

"It's two magics. Archiver and Lightning." 

"Archiver and Lightning?" 

Sona was familiar with "Lightning," and she was happy to learn it, but what was "Lightning"?

"This will be our family's trademark magic. Only we and our child will learn it." 

"Um." Sona blushed but nodded eagerly. 

"..." Serafall. 

Child...

As they were a husband and a wife, naturally, they would have children, and Sona wished to have them as soon as possible. 

However, Riser wasn't in a hurry as there was one year before Sona graduated, and she was extremely busy with her debut of the "Rating Game," youth gathering, and "Rating Game" school for the low-class and reincarnated devils. 

While having children might not affect the development of all of them, Riser knew that when his wife was pregnant, he would be the one who took care of the rest. Frankly, it didn't matter to him as those matters were easily solved by him, but he knew there were many dangers in his surroundings, and he didn't want his child to be born in such a dangerous time. 

Still, he taught his wife "Archiver" and also "Lightning," a magic that created a shortcut in the process of transmitting electrical signals to the brain, making the body move based on reflex, creating a faster reaction to movement. 

Those two magics... even though they might not have crazy firepower, Sona knew how precious they were. 

"Dear..." 

Frankly, Sona wondered whether it was okay for her to learn those magics. 

Riser only smiled and gently raised her bangs, kissing her forehead. "You are my wife, Sona." There was no need for more words as her status was enough to make him pamper her and give his everything to protect her. 

"Um..." 

Sona hugged him as she leaned on his chest. 

"...."

Serafall took a deep breath, and her mind started to waver, wondering whether she was really satisfied with observing from a distance. 

Still, as Riser hugged his wife, he thought for a moment and asked, "By the way, Sona, do you want to learn swordsmanship?" 

"...eh?"