BL about forced marriage

I'm not sure if forced marriage outside of omegaverse exists

Try these
https://www.mangago.zone/read-manga/royal_fiance/

https://www.mangago.zone/read-manga/kamisama_no_uroko/

https://www.mangago.zone/read-manga/ryoushu_sama_no_hana_yome/

https://www.mangago.zone/read-manga/himekoi_mitsuya_bond/

https://www.mangago.zone/read-manga/the_crows_marriage/

https://www.mangago.zone/read-manga/lala_no_kekkon/

https://www.mangago.zone/read-manga/muri_marriage/

https://www.mangago.zone/read-manga/melty_night/

https://www.mangago.zone/read-manga/bokun_wo_no_kekkon/

https://www.mangago.zone/read-manga/ookami_he_no_yomeiri/

https://www.mangago.zone/read-manga/tasogare_wa_karera_no_jikan/

https://www.mangago.zone/read-manga/the_secret_agreement/

https://www.mangago.zone/read-manga/dragon_s_bride/

https://www.mangago.zone/read-manga/ghost_wedding/

https://www.mangago.zone/read-manga/the_titan_s_bride/

https://www.mangago.zone/read-manga/shadow_monster_and_groom/ New!

https://www.mangago.zone/read-manga/the_taming_1/ New!

https://www.mangago.zone/read-manga/oh_wind_descend_upon_us/ New!

You might have more luck finding works with a “marriage of convenience” trope instead, like this one;
https://www.mangago.zone/read-manga/oretachi_wa_shinkon_san_kamo_shirenai/

https://www.mangago.zone/read-manga/fever_1/

https://www.mangago.zone/read-manga/the_demon_leader_s_lover/

It's not forced, per se, but they have to be together for their own benefits
https://www.mangago.zone/read-manga/flip_the_script/

https://www.mangago.zone/read-manga/palace_of_bardo/

Idk if this counts, it's more of arrange marriage

https://www.mangago.zone/read-manga/muri_marriage/