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Similar but I guess this is not what u looking for but so similar lol
https://www.mangago.zone/read-manga/the_crows_marriage/
Oh my that clicked me, this ??
https://www.mangago.zone/read-manga/lala_no_kekkon/
Anyone know this manga where the uke's sister was supposed to marry the seme bust she ran away with some other dude, so the uke was forced to replace her and married the seme, which actually turns out to be the seme's plan was to marry the uke from the beginning as he helped uke's sister in her run.
Not sure if this is understandable but please!!! If anyone knows the name tell me