I’m guessing seke relationships mean sexual ones but if I’m wrong ignore this list
Behind the Scenes: https://www.mangago.me/read-manga/behind_the_stage/
Red string quest: https://www.mangago.me/read-manga/red_string_quests/
Unsleep: https://www.mangago.me/read-manga/unsleep/
Mr. 100% Perfect: https://www.mangago.me/read-manga/mr_100_perfect/
The Ghost's Nocturne: https://www.mangago.me/read-manga/night_song_mgs/
Haunted by Desire (it has rape tho): https://www.mangago.me/read-manga/ghost_child/
Dangerous Conveniece Store: https://www.mangago.me/read-manga/dangerous_convenience_store/
Bj alex: https://www.mangago.me/read-manga/bj_alex/
Payback: https://www.mangago.me/read-manga/payback_1/
Toys of the Trade: https://www.mangago.me/read-manga/joseon_sex_shop/
Painter of the Night: https://www.mangago.me/read-manga/yahwacheop/
Red Limit: https://www.mangago.me/read-manga/red_area/
Perfect Buddy: https://www.mangago.me/read-manga/perfect_buddy/
Unintentional love story: https://www.mangago.me/read-manga/unintentional_love_story/
Bongchon Bride: https://www.mangago.me/read-manga/bongchon_bride/
Note: I just realized these are all Bl so if you don’t like Bl these are not for you
And thank you to the cat lady form Reddit that reced me half this sh*t
I hope this helps(づ ̄ ³ ̄)づ
Idk how long you've been reading for but here's some names for different roles/positions you will see :)
Seke, also know as a "switch" or "riba".
Seme, also may be referred to as a "top". Another name that is more common in yuri, but is still sometimes used in yaoi is "tachi".
Uke, also may be referred to as "bottom". Again, another name that is more commonly seen in yuri, but is still sometimes used in yaoi is "neko".

I beg upon the experts, please recommend me some good seke relationships