reunion, murderer llewellyn's enchanting dinner invitation (peak), spinach bouquet, anything from here: https://www.mangago.zone/home/mangalist/3118964/
went through ur want to read list a little & try radio storm (rly interesting, tw for rape js skip the whole chap it serves no purpose to the plot) & hotel phryne (rly rly interesting) are good too
i second everything gojo said
(havent read this but) no sex so far from what i've seen
https://www.mangago.zone/read-manga/soul_fire/
psychological, shounen ai
https://www.mangago.zone/read-manga/truth_or_dare/
fantasy, historical, shounen ai but sex is shown off screen
https://www.mangago.zone/read-manga/paljae/
mystery, drama, action, shounen ai (rly not much romance lmao, bonus points cuz its my fav tho)
https://www.mangago.zone/read-manga/sangyang_the_wanderer/
fantasy, historical, i dont think they had sex until ch 40 or smth? but theres also a version completely without the sex if u wanna check that out
https://www.mangago.zone/read-manga/stigmata_1/
historical, drama, action, no sex until ch 100 ish
https://www.mangago.zone/read-manga/beauty_and_the_west_chamber/
action, hunterverse, no nsfw until ch 50 or somewhere after that iirc
https://www.mangago.zone/read-manga/death_delayed_for_a_short_time_because_of_the_will/
historical, mystery, shounen ai
https://www.mangago.zone/read-manga/count_tachibana/
historical, drama, i think there is sex within the first 20 chs but it focuses much more on the plot
https://www.mangago.zone/read-manga/bongchon_bride/
Something like bad apple? With actual plot? And no don't recommend me red candy. I can't believe I am saying this but I am tired of all the yaois where the mcs can't keep themselves off of each other for even a second. Please I want good plot, no problemo with sex but not in the first 20 chaps at least or has sex as the main focus of the plot.