Hi everybody!
I'm not sure which gender preference you have, so I've added all!
https://www.mangago.zone/read-manga/soulmate_yuri/ (GxG, time travel shenanigans)
https://www.mangago.zone/read-manga/turning/ (BxB, slowburn but they're both DEFINITELY yearning. MC is an unreliable narrator.)
https://www.mangago.zone/read-manga/jibaku_shounen_hanako_kun/ (a classic. both main and side couples is all impossible yearning. BxG, BxB, BxG)
https://www.mangago.zone/read-manga/your_majesty_please_don_t_kill_me_again/ (BxG, personally didn't like FL or ML but they definitely got to a point of unreasonable yearning)
https://www.mangago.zone/read-manga/a_way_to_protect_you_sweetheart/ (BxG, both so terribly in love with each other)
Yearner x yearner thanks