Serafall immediately grabbed Kisuke's collar and started shaking him, "You have to do something! You're the only one who has any idea of what's going on, so you have to do something!"
"I can forcefully pull her out of that state, however, doing so would hurt her progress, and I don't know how much of that would affect her future. As I've said before, I want her to pull herself out of it on her own."
"But---!?"
Kisuke didn't allow her to continue and made it clear, "Just so you know, I wouldn't risk Sona's life over something like this, so before anything drastic happens, I won't hesitate to do what needs to be done, so you don't have to worry. It's just that, at this point in time, I have virtually no idea how we can help her, and we're running out of time."
The two of them then separated and flew backward to dodge the giant tentacle that could split them in two, before coming together once again, "Not a single idea to help her?"
Kisuke shook his head, "Nope~ This is her inner conflict, so I really don't have any idea. Even if we said anything motivational, aside from being cringey, I doubt she could hear us."
They dodged a few more times and each time they did it, Kisuke noticed Serafall's face scrunching up every instance until she opened her eyes widely and yelled, "Fine! Ki-tan, rip that mask off and give her a deep kiss! And when I say deep, I mean those kisses you see in movies!"
"...Huh?" Kisuke was dumbfounded. He couldn't see how that would help aside from agitating Sona even more, as any actions against her would just be seen as an assault.
"Don't give that dumb face! You should have read some fairytales at some point! I'm telling you to go wake up the princess with your kiss, prince!"
"No, no, no. I still can't see how that is going to work!"
"Do you have any other idea!? None, right!? And how could you be considered a man of science, when you're already brushing me off as wrong without providing evidence!? Or, do you have any problem with kissing my So-tan!? Is that it!? Are you actually just playing around with her!? Come'ere and let's fight! This time, I'll beat you into submission!" Aside from dodging, Serafall actually started sending spears of ice toward Kisuke.
Kisuke now had to dodge both of the sisters, but that was the least of his worries, as his pride was hurt by his own doing, "You know what? Fair point. You have every right to call me dumb because I'm a dumbass. I'm going now."
Kisuke weaved through the black tentacles. Although their offensive capabilities were massive, Sona was using them simple enough that it was very easy to read the flow.
Of course, Sona immediately noticed that this method wasn't effective and immediately changed her approach. The giant tentacles broke up into pieces and reshaped themselves into black needles, at least a million of them from Kisuke's initial estimation.
These needles instantly surrounded Kisuke, leaving him with no gap to go through. Bringing her arm forward, Sona willed the needles to rush at him simultaneously and the result was within her expectations.
Kisuke wasn't able to dodge the onslaught and his body couldn't even be seen from her perspective. However, she knew that he wouldn't die from something like that, but it should be enough to keep him in there.
Sona was about to move to her next target, Serafall, when she suddenly heard Kisuke's voice behind her, "Although it was just your instincts working, you have a clear goal. How intriguing~!"
Sona's eyes behind her mask widened and her arm immediately transformed into a blade as she waved it behind her. But when she turned around, Kisuke was not there anymore, only to hear his voice on her left this time, "It's sad to say, but we don't have enough time. If this doesn't work, I'll be putting your soul into forced stasis and wake you up slowly from there."
Putting his hand on her mask, Kisuke intended to rip it off. However, just as he was about to pull, the texture of the mask shocked him, enough that his expression instantly changed, 'T-this is not Reishi but Phosphoplasm!? How!?'
Nevertheless, he didn't have enough time to think about this discovery and crushed the mask into pieces before putting a small portion of it in a special container that he'd prepared for occasions like this.
Recovering his bearings, Kisuke looked down on Sona's face and lifted her chin. Sona tried to move and retaliate but found herself paralyzed. After an extended amount of time watching her and studying her ability, Kisuke had already figured out how to stop her, albeit temporarily.
Smirking at her rageful expression, Kisuke muttered, "The usual Sona-chan is a lot cuter. Give her back.", before plunging his lips onto hers.
Sona instantly started struggling, and the spell that Kisuke placed on her was already falling apart.
After a few more moments, Kisuke was already done placing the spell that would forcefully put Sona's soul into sleep through her mouth. He was about to separate from her since there were no changes in Sona despite following Serafall's directions, but he suddenly felt her arms wrapped around him and she started reciprocating, 'It actually worked!?'
Kisuke looked into Sona's eyes and noticed their playful glint before closing them, while ramping up her efforts to play with Kisuke's tongue.
Slowly but surely, the black water turned transparent before disappearing into nothing and the broken pieces of Sona's mask sipped back to her body, along with the rest of her armor.
Although it was her idea, Serafall could only be dumbfounded at the kiss she had only seen in movies aimed at adults.
Separating with a trail of saliva still connecting them, Sona looked up to Kisuke with a flushed face, "I'm sorry for all the trouble."
But Kisuke just flicked her forehead and said, "More than apologizing, there's something else you should say, right?"
The pain reminded Sona of something else and replied with a big smile, "I'm back~!"
"Welcome back~."