Chansoo are very cute! Sorry for the late answer, I got so busy this week TT and there is no need to apologize for your question, I'm happy to answer <333

I think their friendship is super precious, and I love how Kyungsoo seems to understand Chanyeol and knows how best to be kind to him. Kyungsoo is also one of those people who are very protective of their boundaries and very firm and clear about what they want from others, making it hard for Chanyeol to hurt him unintentionally; he must be very soothing to be around for someone like Chanyeol, who is so distractable and in flux.

In an rpf and speculative way, I haven't tried to delve into how fandom portrays them, because I very much don't ship them. So, I can't make any comment on what the general perception of them as a ship is.

Personally, I just don't see any romantic or sexual tension between them at all, but I don't put it completely off the table that Chanyeol might have crushed on Kyungsoo at some point, he rotated his crushes around the entire band without prejudice lmao. I just have not once seen Kyungsoo react to him in anything but friendly ways, and I enjoy their friendship.

I think it's good for both of them to have each other around, but I also deeply do not find them compatible in any way past friendship: Kyungsoo's boundaries would make Chanyeol so sad in a relationship because Chanyeol would be so invested in making his partner happy by actively doing things for them, which Kyungsoo would, unfortunately, receive like infantilization and a presumption of incompetence, and that would make Chanyeol so sad and tie his hands, making him unsure how to behave to show his love instead. And Chanyeol is always thinking about 498 things at once, he changes hobbies, interests, and ideas on a whim without warning, and while I'm sure Kyungsoo appreciates that about him as a friend and finds it refreshing, having Chanyeol as a permanent fixture to do life with would exhaust him. They just don't fit.

I always enjoy seeing updates of them together, they do seem to enjoy each other's company and trust and count on each other in important ways <333 I just don't personally ship them