Slowburn yaoi with 80+ chapters

turning

Mo dao zu shi/grandmaster of demonic cultivation
Two souls (main story: 71 chaps, sides: 15)
Unbreakable master
Full moon alchemist
My guildmate next door
Payback
Red candy
Passion
Biting the Tiger (with the side stories)

Kinda (?) Slowburn:
Can't Think Straight
Kill Me If You Can
Define the relationship
Roses and champagne

https://www.mangago.me/read-manga/incidentally_dyed_by_spring_s_love/

https://www.mangago.me/read-manga/half_of_me/

https://www.mangago.me/read-manga/cosmic_boy/

https://www.mangago.me/read-manga/a_trace_of_the_wonder/