>>1708768>Do you really need some sort of profound reason to like someone? Suisei likes Mori, simple as.To answer your question, no, not necessarily; sometimes you just like people and can't find any particular reason for it. Sometimes it just happens. Even speaking generally everyone can like whatever they want to like, just as everyone can dislike whatever they want to dislike.
If Mori and Suisei want to collab, then let them collab; if they don't, then they won't. Either it happens or it doesn't; there's no use in spilling your own milk then crying over it. Like
>>1708842 said, if they want to collab then good for them but I'm not going to go ballistic if they don't; both of them are probably very busy with their individual projects and other works. If they collab, let it happen naturally instead of forcing it.