[Lol, you suggest topics but ultimately you let me choose? I’ll go with First Time Falling In Love/Falling In Love In General
don’tletmechoosethingsyousillyduckling (´ゝз・`)ﾉ ]
Kuroo: Kuroo would notice his behavior changing slowly, the more time he spent with his crush. It would soon doom on him, that he probably felt more towards them than to other people in his environment. Becoming calmer with every day he managed to be with them, Kuroo would feel the growing urge to gently touch his crush or simply do something nice for them. He would want to see their smile, which would be the sole reason he would go out of his way to do them various favours, starting to read between the lines of a lot of things they said. Kuroo wouldn’t confess his feelings towards them for a long time, wanting to see whether his crush felt the same way about him.
Kai: Once Kai would develop romantic feelings towards somebody else, he would actually feel even more at ease than usually. He would try to dwell on the positive feeling as long as he could, smiling gently at his crush whenever they shared conversations with each other. He would offer them a helping hand without having to be asked, trying to show them with his gestures that he liked them dearly. Not wanting to appear too pushy, Kai would decide to wait for them to approach him at least a little, fearing that his actions would have been interpreted as a mere act of friendly behavior.
Yamamoto: Truly falling in love with someone would probably be very hard for someone like Yamamoto. If it was a female, he would certainly have an even more difficult time trying to even look at them without turning into a blushing mess. If it was a male, Yamamoto would certainly show signs of nervousness too, finding it incredibly hard to approach them without seeming too rude or boisterous. However, despite all that, Yamamoto would certainly be able to differentiate between finding someone physically attractive and actually having a crush on someone. As a matter of fact, other people he would normally gush over, would slowly fade out of his field of attention and Yamamoto would instead focus on mustering up the courage to talk to his crush.
Kenma: The first time Kenma would have fallen in love with someone, it would have taken him quite a while to figure out what on earth was wrong with him. Feeling rather fidgety and restless around his crush wouldn’t necessarily have been new to Nekoma’s setter, considering the fact that he reacted that way around other people as well. What would have surprised him, though, would have been the constant urge to look up in order to glance at his crush’s face. It would be possible that Kuroo would have given him the final clue, allowing Kenma to draw the conclusion that it had been romantic feelings distorting his behavior in such a way.
Haiba: Lev would certainly be excited about discovering his crush towards someone else. Barely wasting a thought about the possibility that they could not like him the way he did or him acting rather obvious and embarrassing in front of them, Nekoma’s newest member would do his utmost to draw their attention towards him. He would try to impress them by showing them his best spikes (and probably failing most of the time), urging them to come and watch him during practice. Whenever his team- or classmates mentioned his obvious crush on that person, Lev probably wouldn’t mind them knowing about it, hoping that his crush would start feeling the same way towards him soon too.
Yaku: The second Yaku would know that he had inevitably developed a crush on someone, he would initially be slightly reluctant to talk to them. Knowing that there would be no way around blushing at least a little bit, Yaku would make a futile attempt at sparing himself from the discomfort. Feeling drawn to them whenever he caught sight of them, he wouldn’t be able to help himself, greeting them with a wide smile. As a matter of fact, the hint of this very smile would linger on his lips and face throughout the entire conversation he would have with his crush and Yaku would catch himself starting to stare at them in a dreamy way. Much to his teammates’ amusement, Nekoma’s libero would get mad at himself for exposing his own feelings in front of his crush in such an obvious way.
Shibayama: Even though Shibayama would feel rather shy around his crush, he wouldn’t dare to turn away to hide his blushing face, fearing that they might take it the wrong way. He would act rather timid around his crush, gently offering his help whenever they exclaimed having trouble with something. Shibayama would try to support them without appearing to be too pushy or intrusive, constantly wondering whether they would ever see him the same way he pictured them. But despite his worries, he would continue staying in close contact with his crush, refusing to give up on someone who made him feel that good about himself by merely being there.
Inuoka: Inuoka would probably be oblivious to his own feelings towards his crush for a long time. Even if his team- and classmates suggestively asked him about his thought on that person, he would happily tell them about how great they were, failing to realize that he was obviously putting them on a pedestal. Inuoka would prefer to focus on the warmth he felt whenever he spent time with his crush, enjoying to make them laugh and simply exchange thoughts with them. He would become aware of his crush towards them once he would be separated from them for a longer period of time, noticing that his thoughts constantly wandered towards them. However, Inuoka would probably rather clueless as to how to approach them with this new insight in his emotions.
Fukunaga: Once Fukunaga would have discovered his growing feelings towards his crush, he would find himself glancing over to them ever so often. He would wonder whether they would have noticed his presence at all and if, what they thought about him and his silent nature. Fukunaga would be rather reluctant to initiate contact with them, worrying that they might not like him the way he liked them. At some point he would even try to speak to them, hoping that the sound of his voice would finally grant him their absolute attention.