https://www.mangago.me/read-manga/i_wanna_die_before_i_m_30/
https://www.mangago.me/read-manga/there_s_no_way_this_is_fate/ (the sequel is better!!)
https://www.mangago.me/read-manga/there_s_no_way_this_is_fate_newlyweds_arc/ (sequel to the one above)
These are all yuri:
https://www.mangago.me/read-manga/goukaku_no_tame_no_yasashii_sankaku_kankei_nyuumon/
https://www.mangago.me/read-manga/there_s_weird_voices_coming_from_the_room_next_door/
https://www.mangago.me/read-manga/luminous_blue/
https://www.mangago.me/read-manga/watashi_no_shumi_tte_hen_desu_ka/
https://www.mangago.me/read-manga/beast_knights/ (I honestly don't remember if they're actually a throuple or if it's a two people sharing a lover kind of thing, sorry)
Throuples that are actually throuples and two ppl in the rrlationship dont just share a lover༎‿༎
Anything is welcome but id prefer it to not be one shots. Yuri, yaoi and het(is that even possible) is fine im just thirsty for throuples rn