i'd love to rec this one https://www.asianfanfics.com/story/view/1450427/hospital-365
It's OT9 but Kris, Tao and Luhan do make multiple appearances :)

I would like to recommend you to read some of the stories from xoxonew . I really like their works .

here : https://www.asianfanfics.com/profile/view_author_stories/1202287/L

The straight Guys : https://www.asianfanfics.com/story/view/1177710/the-straight-guys-angst-drama-exo-kai-forbiddenlove-kyungsoo-kaisoo

And

Tale : https://www.asianfanfics.com/story/view/1175863/the--tale-pwp-kai-kyungsoo-kaisoo

these are really good ,, and i hope that you'll enjoy these fics . Thanks and please leave a comment on the fics , it will really encourage the authors

Coming back with a fic rec! Well it's a very short OT12 fic from entitled Warmth from Iamtheunicornwolf. It's about Baekhyun and everyone else with lots of cuddles and feels in between. Here's the link:

https://www.asianfanfics.com/story/view/1012983/warmth-exo-baekhyun-baekhyunxeveryone

(There's a sequel entitled Falling Stars however it's mostly Lay and OT9 with mentions of the the other 3. Not exactly fitting to your list but it's worth reading too)

Chapter 26: Thank you for this!!! This is the most helpful ficrec I have come across! I really hope you continue to update it!!

Chapter 11: Ot12 fic rec! Yeah! I've read Office Antics and And The Rose Said To Me and they are definitely good. I'll look forward to reading the rest and more. Hopefully I can share some of my fave ones but that also means going through hundreds of those I have already read which is tedious but I'll be glad to contribute sometime. Nice work dear